Patent Document

RELATED APPLICATION DATA 
       [0001]    The present application claims priority to Japanese Priority Patent Application JP 2009-294698 filed in the Japan Patent Office on Dec. 25, 2009, the entire content of which is hereby incorporated by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    The present invention relates to a semiconductor device such as a solid-state imaging device, a method of manufacturing the same, and an electronic apparatus such as a camera with the solid-state imaging device. 
         [0003]    Solid-state imaging devices include an amplification type solid-state imaging device of which an illustrative example is a MOS image sensor such as a CMOS (Complementary Metal Oxide Semiconductor). In addition, solid-state imaging devices include a charge-transfer type solid-state imaging device of which an illustrative example is a CCD (Charge Coupled Device) image sensor. These solid-state imaging devices are widely used in digital still cameras, digital video cameras, and the like. In recent years, MOS image sensors have widely been used as solid-state imaging devices mounted on mobile apparatuses such as portable phones with an attached camera or PDAs (Personal Digital Assistant), in terms of low power voltage, power consumption, and the like. 
         [0004]    A MOS solid-state imaging device includes a pixel array (pixel region), where a plurality of unit pixels each including a photodiode serving as a photoelectric conversion unit and a plurality of pixel transistors are arranged in the form of a two-dimensional array, and a peripheral circuit region. The plurality of pixel transistors are formed as MOS transistors and include three transistors of a transfer transistor, a reset transistor, and an amplification transistor, or include four transistors, including a selection transistor. 
         [0005]    In the past, various MOS solid-state imaging devices were suggested in which a semiconductor chip in which a pixel array arranging a plurality of pixels is formed and a semiconductor chip in which a logic circuit performing a signal process is formed are electrically connected to each other to form one device. Japanese Unexamined Patent Application Publication No. 2006-49361 discloses a semiconductor module in which a back-illuminated image sensor chip including a micropad in each pixel cell and a signal processing chip including a signal processing circuit and micropads are connected to each other by a microbump. 
         [0006]    International Publication No. WO 2006/129762 discloses a semiconductor image sensor module in which a first semiconductor chip including an image sensor, a second semiconductor chip including an analog/digital converter array, and a third semiconductor chip including a memory element array are stacked. The first and second semiconductor chips are connected to each other by a bump which is a conductive connection conductor. The second and third semiconductor chips are connected to each other by a through contact penetrated through the second semiconductor chip. 
         [0007]    As disclosed in Japanese Unexamined Patent Application Publication No. 2006-49361, various techniques for combining different kinds of circuit chips such as an image sensor chip and a logic circuit performing signal processing have been suggested. In techniques according to a related art, functional chips in a nearly completed state are connected to each other by forming a through connection hole or via a bump. 
         [0008]    The inventors have recognized a problem with bonded semiconductor chip sections where pair ground capacitance and adjacent coupling capacitance occur as parasitic capacitance. The pair ground capacitance is parasitic capacitance occurring between a wiring and a semiconductor substrate, for example, with a ground potential. The adjacent coupling capacitance is parasitic capacitance between adjacent laying wirings or adjacent conductors. While the counter ground capacitance may be cleared when a power source is enhanced or a buffer circuit is provided to allow current to flow, the adjacent coupling capacitance may not be cleared due to interference between adjacent lines. 
         [0009]    This problem with the parasitic capacitance may also arise in a semiconductor device in which semiconductor chip sections each including a semiconductor integrated circuit are bonded to each other and both the semiconductor chip sections are connected by a connection conductor and a through connection conductor. 
         [0010]    It is desirable to provide a semiconductor device such as a solid-state imaging device reducing parasitic capacitance to achieve high performance and a method of manufacturing the semiconductor device. It is desirable to provide an electronic apparatus, such as a camera, which includes the solid-state imaging device. 
       SUMMARY OF THE INVENTION 
       [0011]    One embodiment consistent with the present invention provides a semiconductor device comprising a first semiconductor section including a first wiring layer at one side thereof, a second semiconductor section including a second wiring layer at one side thereof, the first and second semiconductor sections being secured together with the respective first and second wiring layer sides of the first and second semiconductor sections facing each other, and a conductive material extending through the first semiconductor section to the second wiring layer of the second semiconductor section and by means of which the first and second wiring layers are in electrical communication. 
         [0012]    In another embodiment consistent with the present invention, the first semiconductor section and the second semiconductor section are secured by plasma bonding. 
         [0013]    In another embodiment consistent with the present invention, the first semiconductor section and the second semiconductor section are secured by an adhesive. 
         [0014]    In another embodiment consistent with the present invention, the semiconductor device includes a control region between a pixel array region and a removal region. 
         [0015]    In another embodiment consistent with the present invention, the conductive material is formed in the removal region of the semiconductor device. 
         [0016]    In another embodiment consistent with the present invention, a portion of the first semiconductor in the removal region is removed. 
         [0017]    In another embodiment consistent with the present invention, the semiconductor device further comprises a light shielding film formed over the first semiconductor section in the control region of the semiconductor device. 
         [0018]    Another embodiment consistent with the present invention provides, a method of manufacturing a semiconductor device including the steps of forming a first semiconductor section including a first wiring layer at one side thereof, forming a second semiconductor section including a second wiring layer at one side thereof, bonding the first semiconductor section to the second semiconductor section with the respective first and second wiring layer sides of the first and second semiconductor sections facing each other, and providing a conductive material extending through the first semiconductor section to the second wiring layer of the second semiconductor section so that the first and second wiring layers are in electrical communication. 
         [0019]    In another embodiment consistent with the present invention, the first semiconductor section and the second semiconductor section are secured by plasma bonding. 
         [0020]    In another embodiment consistent with the present invention, the first semiconductor section and the second semiconductor section are secured by an adhesive. 
         [0021]    In another embodiment consistent with the present invention, the semiconductor device includes a control region between a pixel array region and a removal region. 
         [0022]    In another embodiment consistent with the present invention, the conductive material is formed in the removal region of the semiconductor device. 
         [0023]    In another embodiment consistent with the present invention, a portion of the first semiconductor in the removal region is removed. 
         [0024]    In another embodiment consistent with the present invention, the method includes the step of forming a light shielding film formed over the first semiconductor section in the control region of the semiconductor device. 
         [0025]    Another embodiment consistent with the present invention includes a semiconductor device comprising a first semiconductor section including a first wiring layer on one side and a device layer on the opposite side of the first wiring layer, a second semiconductor section including a second wiring layer at one side thereof, the first and second semiconductor sections being secured together with the respective first and second wiring layer sides of the first and second semiconductor sections facing each other, a first conductive material which extends through the device layer of the first semiconductor section to a connection point in the first wiring layer of the first semiconductor section, and a second conductive material which extends through the first semiconductor section to a connection point in the second wiring layer of the second semiconductor section such that the first and second wiring layers are in electrical communication. 
         [0026]    In another embodiment consistent with the present invention, the first semiconductor section and the second semiconductor section are secured by plasma bonding. 
         [0027]    In another embodiment consistent with the present invention, the first semiconductor section and the second semiconductor section are secured by an adhesive. 
         [0028]    In another embodiment consistent with the present invention, the semiconductor device includes a control region between a pixel array region and a removal region. 
         [0029]    In another embodiment consistent with the present invention, the conductive material is formed in the removal region of the semiconductor device. 
         [0030]    In another embodiment consistent with the present invention, a portion of the first semiconductor in the removal region is removed. 
         [0031]    In another embodiment consistent with the present invention, the semiconductor device includes a light shielding film is formed over the first semiconductor section in the control region of the semiconductor device. 
         [0032]    In another embodiment consistent with the present invention, the semiconductor device includes a connection point which connects an end portion of the first connecting material on the first semiconductor side of the semiconductor device to an end portion of the second semiconductor material on the first semiconductor side of the semiconductor device. 
         [0033]    Another embodiment consistent with the present invention provides a method of manufacturing a semiconductor device including the steps of forming a first semiconductor section including a first wiring layer on one side and a device layer on the opposite side of the first wiring layer, forming a second semiconductor section including a second wiring layer at one side thereof, bonding the first semiconductor section to the second semiconductor section with the respective first and second wiring layer sides of the first and second semiconductor sections facing each other, providing a first conductive material which extends through the device layer of the first semiconductor section to a connection point in the first wiring layer of the first semiconductor section, providing a second conductive material parallel which extends through the first semiconductor section to a connection point in the second wiring layer of the second semiconductor section such that the first and second wiring layers are in electrical communication. 
         [0034]    In another embodiment consistent with the present invention, the first semiconductor section and the second semiconductor section are secured by plasma bonding. 
         [0035]    In another embodiment consistent with the present invention, the first semiconductor section and the second semiconductor section are secured by an adhesive. 
         [0036]    In another embodiment consistent with the present invention, the semiconductor device includes a control region between a pixel array region and a removal region. 
         [0037]    In another embodiment consistent with the present invention, the conductive material is formed in the removal region of the semiconductor device. 
         [0038]    In another embodiment consistent with the present invention, a portion of the first semiconductor in the removal region is removed. 
         [0039]    In another embodiment consistent with the present invention, the semiconductor device includes a light shielding film formed over the first semiconductor section in the control region of the semiconductor device. 
         [0040]    Another embodiment consistent with the present invention provides an electronic apparatus including an optical unit and an imaging unit including (a) a first semiconductor section including a first wiring layer and a device layer on the first wiring layer, (b) a second semiconductor section including a second wiring layer at one side thereof, the first and second semiconductor sections being secured together with the respective first and second wiring layer sides of the first and second semiconductor sections facing each other, (c) a first conductive material which extends through the device layer of the first semiconductor section to a connection point in the first wiring layer of the first semiconductor section, and (d) a second conductive material which extends through the first semiconductor section to a connection point in the second wiring layer of the second semiconductor section such that the first and second wiring layers are in electrical communication. 
         [0041]    In another embodiment consistent with the present invention, the apparatus includes a shutter device between the optical unit and the imaging unit. 
         [0042]    Another embodiment consistent with the present invention provides an electronic apparatus including an optical unit and an imaging unit including (a) a first semiconductor section including a first wiring layer on one side and a device layer on the opposite side of the first wiring layer, (b) a second semiconductor section including a second wiring layer at one side thereof, the first and second semiconductor sections being secured together with the respective first and second wiring layer sides of the first and second semiconductor sections facing each other, (c) a first conductive material which extends through the device layer of the first semiconductor section to a connection point in the first wiring layer of the first semiconductor section, and (d) a second conductive material which extends through the first semiconductor section to a connection point in the second wiring layer of the second semiconductor section such that the first and second wiring layers are in electrical communication. 
         [0043]    In another embodiment consistent with the present invention, the apparatus includes a shutter device between the optical unit and the imaging unit. 
         [0044]    Other systems, methods, features, and advantages of the present invention will be or will become apparent to one with skill in the art upon examination of the following figures and detailed description. It is intended that all such additional systems, methods, features, and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0045]    The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an implementation of the present invention and, together with the description, serve to explain the advantages and principles of the invention. In the drawings: 
           [0046]      FIG. 1  is a diagram illustrating an exemplary overall configuration of a MOS solid-state imaging device that is consistent with the present invention. 
           [0047]      FIGS. 2A to 2C  are schematic diagram illustrating a solid-state imaging device that is consistent with the present invention and a solid-state imaging device according to a related art. 
           [0048]      FIG. 3  is a diagram illustrating one embodiment of the overall configuration of the main units of the solid-state imaging device that is consistent with the present invention. 
           [0049]      FIG. 4  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0050]      FIG. 5  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0051]      FIG. 6  is a diagram (third manufacturing process diagram) illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0052]      FIG. 7  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0053]      FIG. 8  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0054]      FIG. 9  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0055]      FIG. 10  is a diagram) illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0056]      FIG. 11  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0057]      FIG. 12  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0058]      FIG. 13  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0059]      FIG. 14  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0060]      FIGS. 15A and 15B  are schematic plan views illustrating one embodiment of the positions of semiconductor removal regions that are consistent with the present invention. 
           [0061]      FIG. 16  is a diagram illustrating one embodiment of the overall configuration of the main units of a solid-state imaging device that is consistent with the present invention. 
           [0062]      FIG. 17  is a diagram (illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0063]      FIG. 18  is a diagram (illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0064]      FIG. 19  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0065]      FIG. 20  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0066]      FIG. 21  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0067]      FIG. 22  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0068]      FIG. 23  is a diagram (illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0069]      FIG. 24  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0070]      FIG. 25  is a diagram illustrating one embodiment of an overall configuration of the main units of a solid-state imaging device that is consistent with the present invention. 
           [0071]      FIG. 26  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0072]      FIG. 27  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0073]      FIG. 28  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0074]      FIG. 29  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0075]      FIG. 30  is a diagram illustrating one embodiment of a manufacturing process for a solid-state imaging device that is consistent with the present invention. 
           [0076]      FIG. 31  is a diagram illustrating one embodiment of an overall configuration of the main units of a solid-state imaging device that is consistent with the present invention. 
           [0077]      FIG. 32  is a schematic sectional view taken along the line XXXII-XXXII of  FIG. 31 . 
           [0078]      FIG. 33  is a schematic sectional view taken along the line XXXIII-XXXIII of  FIG. 31 . 
           [0079]      FIG. 34  is an exploded plan view illustrating a first connection pad in  FIG. 31 . 
           [0080]      FIG. 35  is an exploded plan view illustrating a second connection pad in  FIG. 31 . 
           [0081]      FIG. 36  is a diagram illustrating the overall configuration of the main units of a solid-state imaging device that is consistent with the present invention. 
           [0082]      FIG. 37  is a diagram illustrating the overall configuration of the main units of a solid-state imaging device that is consistent with the present invention. 
           [0083]      FIG. 38  is a schematic sectional view taken along the line XXXVIII-XXXVIII of  FIG. 37 . 
           [0084]      FIG. 39  is a diagram illustrating one embodiment of an overall configuration of the main units of a solid-state imaging device that is consistent with the present invention. 
           [0085]      FIG. 40  is a diagram illustrating one embodiment of an overall configuration of the main units of a solid-state imaging device that is consistent with the present invention. 
           [0086]      FIG. 41  is a diagram illustrating one embodiment of an overall configuration of the main units of a solid-state imaging device that is consistent with the present invention. 
           [0087]      FIG. 42  is a diagram illustrating one embodiment of an overall configuration of the main units of a solid-state imaging device that is consistent with the present invention. 
           [0088]      FIG. 43  is a diagram illustrating one embodiment of an overall configuration of a solid-state imaging device having the layout of the connection pads that is consistent with the present invention. 
           [0089]      FIG. 44  is a schematic plan view illustrating one embodiment of the layout of the connection pads of the solid-state imaging device that is consistent with the present invention. 
           [0090]      FIG. 45  is a diagram illustrating one embodiment of an overall configuration of a semiconductor device having the layout of the connection pads that is consistent with the present invention. 
           [0091]      FIG. 46  is a schematic plan view illustrating one embodiment of the layout of the connection pads of the semiconductor device in  FIG. 45 . 
           [0092]      FIG. 47  is a diagram illustrating one embodiment of an overall configuration of an electronic apparatus that is consistent with the present invention. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0093]      FIG. 1  is a diagram illustrating the overall configuration of a MOS solid-state imaging device consistent with the present invention. As shown in  FIG. 1 , a solid-state imaging device  1  according to a first embodiment includes a pixel array (so-called pixel region)  3 , in which a plurality of pixels  2  including a photoelectric conversion unit are regularly arranged in the form of a two-dimensional array on a semiconductor substrate  11  such as a silicon substrate, and a peripheral circuit section. The pixel  2  includes a photodiode serving as the photoelectric conversion unit and a plurality of pixel transistors (so-called MOS transistors). The plurality of pixel transistors includes three transistors, for example, a transfer transistor, a reset transistor, and an amplification transistor. Alternatively, the plurality of pixel transistors may include four transistors, including a selection transistor. Since the equivalent circuit of a unit pixel is the same as a general circuit, a detailed description thereof is omitted. The pixel  2  may be configured as one unit pixel. Alternatively, the pixel  2  may have a shared pixel structure. The shared pixel structure includes one floating diffusion and each different pixel transistor shared by a plurality of photodiodes and a plurality of transfer transistors. That is, in the shared pixel, the photodiodes and the transfer transistors forming the plurality of unit pixels each share other pixel transistors, respectively. 
         [0094]    The peripheral circuit section includes a vertical driving circuit  4 , column signal processing circuits  5 , a horizontal driving circuit  6 , an output circuit  7 , and a control circuit  8 . 
         [0095]    The control circuit  8  receives data instructing an input clock, an operation mode, or the like and outputs data such as internal information regarding the solid-state imaging device. That is, based on a vertical synchronization signal, a horizontal synchronization signal, and a master clock, the control circuit  8  generates a clock signal and a control signal which are the references of the operations of the vertical driving circuit  4 , the column signal processing circuits  5 , the horizontal driving circuit  6 , and the like. The control circuit  8  inputs these signals to the vertical driving circuit  4 , the column signal processing circuits  5 , the horizontal driving circuit  6 , and the like. 
         [0096]    The vertical driving circuit  4  formed by a shift register selects pixel driving wirings and supplies pulses for driving the pixel to the selected pixel driving wirings to drive the pixels in a column unit. That is, the vertical driving circuit  4  selectively scans the pixels  2  of the pixel array  3  sequentially in a vertical direction in a column unit and supplies the column signal processing circuits  5  with pixel signals corresponding to signal charges, which are generated in accordance with the amount of light received by the photodiodes serving as the photoelectric conversion units of the respective pixels  2 , via the vertical signal lines  9 . 
         [0097]    The column signal processing circuit  5  is disposed in each column of the pixels and performs signal processing, such as noise removal, on the signals output from the pixels  2  of one column for each pixel column. That is, the column signal processing circuit  5  performs CDS to remove a specific fixed pattern noise of the pixels  2  or performs signal processing such as signal amplification or AD conversion. In the output stage of the column signal processing circuit  5 , a horizontal selection switch (not shown) is connected to the horizontal signal line  10 . 
         [0098]    The horizontal driving circuit  6  formed by a shift register sequentially outputs horizontal scanning pulses, sequentially selects the respective column signal processing circuits  5 , and outputs the pixel signals output from the column signal processing circuit  5  to the horizontal signal line  10 . 
         [0099]    The output circuit  7  processes the signals sequentially supplied from the column signal processing circuits  5  via the horizontal signal line  10  and outputs the processed signals. The signals are only buffered in some cases, or the signals are subjected to black level adjustment, line-variation correction, or various kinds of digital signal processing in some cases. The input/output terminals  12  exchange signals with the outside. 
         [0100]      FIGS. 2A to 2C  are diagrams illustrating the basic overall configuration of a MOS solid-state imaging device according to embodiments of the invention. In a MOS solid-state imaging device  151  according to a related art, as shown in  FIG. 2A , a pixel array  153 , a control circuit  154 , and a logic circuit  155  performing signal processing are mounted on one semiconductor chip  152 . In general, the pixel array  153  and the control circuit  154  form an image sensor  156 . In a MOS solid-state imaging device  21  according to an embodiment of the invention, however, as shown in  FIG. 2B , a pixel array  23  and a control circuit  24  are mounted on a first semiconductor chip section  22 , and a logic circuit  25  including a signal processing circuit which performs signal processing is mounted in a second semiconductor chip section  26 . The MOS solid-state imaging device  21  is formed by electrically connecting the first semiconductor chip section  22  and the second semiconductor chip section  26  to each other to form one semiconductor chip. In a MOS solid-state imaging device  28  according to another embodiment of the invention, as shown in  FIG. 2C , the pixel array  23  is mounted on the first semiconductor chip section  22 , and the control circuit  24  and the logic circuit  25  including a signal processing circuit are mounted on the second semiconductor chip section  26 . The MOS solid-state imaging device  28  is formed by electrically connecting the first semiconductor chip section  22  and the second semiconductor chip section  26  to each other to form one semiconductor chip. 
         [0101]    Although not illustrated, two or more semiconductor chip sections may be bonded to each other to form a MOS solid-state imaging device. A MOS solid-state imaging device may be configured in such a manner that three or more semiconductor chip sections including the first and second semiconductor chip sections and a semiconductor chip section with a memory element array or a semiconductor chip section with another circuit element are bonded to each other to form one chip. 
         [0102]      FIG. 3  is a diagram illustrating one embodiment of a semiconductor device, that is, the MOS solid-state imaging device that is consistent with the present invention. In this first embodiment, the solid-state imaging device  28  includes a stacked semiconductor chip  27  in which the first semiconductor chip section  22  including the pixel array  23  and the control circuit  24  and the second semiconductor chip section  26  including the logic circuit  25  are bonded to each other. The first semiconductor chip section  22  and the second semiconductor chip section  26  are bonded to each other so that multi wiring layers  41  and  55  face each other. The first and second semiconductor chip sections can be bonded by an adhesive layer  57  with protective layers  42  and  56  interposed therebetween in this embodiment. Alternatively, the first and second semiconductor chip sections may be bonded by plasma joining. 
         [0103]    In this embodiment, a semiconductor removal region  52 , where a part of a semiconductor portion of the first semiconductor chip section  22  is entirely removed, is formed and connection wirings  67  each connecting the first semiconductor chip section  22  to the second semiconductor chip section  26  are formed in the semiconductor removal region  52 . The semiconductor removal region  52  covers all regions where each connection wiring  67  connected to a laying wiring  40   d  corresponding to each vertical signal line of the pixel array  23  is formed. As shown in  FIG. 15A , the semiconductor removal region  52  is formed outside the pixel array  23 . The semiconductor removal region  52  corresponds to a so-called electrode pad region. In  FIG. 15A , the semiconductor removal region  52  is formed outside the pixel array  23  in a vertical direction. 
         [0104]    In the first semiconductor chip section  22 , the pixel array  23  including a photodiode (PD), which serves as a photoelectric conversion unit, and a plurality of pixel transistors Tr 1  and Tr 2  and the control circuit  24  including the MOS transistors Tr 3  and Tr 4  are formed in a thinned first semiconductor substrate  31 . The pixel transistors Tr 1  and Tr 2  and the MOS transistors Tr 3  and Tr 4  are representative transistors. On the side of a front surface  31   a  of the semiconductor substrate  31 , the multi wiring layer  41  in which a plurality of wirings  40  [ 40   a ,  40   b , and  40   c ] formed by triple layered metals M 1  to M 3  in this embodiment are disposed is formed using an inter-layer insulation film  39 . The pixel transistors Tr 1  and Tr 2  and the MOS transistors Tr 3  and Tr 4  of the control circuit  24  will be described in detail below in a manufacturing method. 
         [0105]    In the second semiconductor chip section  26 , the logic circuit  25  including MOS transistors Tr 6  to Tr 8  is formed in a second semiconductor substrate  45 . On the side of the front surface  45   a  of the semiconductor substrate  45 , a multi wiring layer  55  in which wirings  53  [ 53   a ,  53   b , and  53   c ] formed by triple layered metals M 11  to M 13  in this embodiment are disposed is formed using an inter-layer insulation film  49 . The MOS transistors Tr 6  to Tr 8  will be described in detail below in the manufacturing method. 
         [0106]    In the semiconductor removal region  52  of the first semiconductor chip section  22 , the entire first semiconductor substrate  31  is removed by etching. A stacked insulation film  61  including a silicon oxide (SiO 2 ) film  58  and a silicon nitride (SiN) film  59  is formed to extend from the bottom surface and the side surface of the semiconductor removal region  31  to the front surface of the semiconductor substrate. The stacked insulation film  61  serves as a protective insulation film that protects the semiconductor substrate  31  exposed to the side surface of a recessed portion of the semiconductor removal region  52  and also serves as an anti-reflection film of the pixels. 
         [0107]    In the semiconductor removal region  52 , a connection hole  64 , which reaches from the silicon nitride film  59  to a first connection pad  65  electrically connected to a necessary wiring in the multi wiring layer  41  a laying wiring  40   d  formed by the third-layer metal M 3  in the first semiconductor chip section  22 , is formed. In addition, a through connection hole  62 , which is penetrated through the multi wiring layer  41  of the first semiconductor chip section  22  and reaches a second connection pad  63  electrically connected to a necessary wiring in the multi wiring layer  55  a laying wiring  53   d  formed by the third-layer metal M 13  in the second semiconductor chip section  26 , is formed. 
         [0108]    The connection wiring  67  includes a connection conductor  68  buried in the connection holes  64  and  62  and electrically connected to the first connection pad  65 , a through connection conductor  69  electrically connected to the second connection pad  63 , and a link conductor  71  electrically connecting both of the conductors  68  and  69  to each other in the upper end of the conductors  68  and  69 . 
         [0109]    A light-shielding film  72  covering the region where light has to be blocked is formed on the side of a rear surface  31   b  that is a light incident surface of a photodiode  34  of the first semiconductor chip section  22 . A planarization film  73  is formed to cover the light-shielding film  72 , on-chip color filters  74  are formed on the planarization film  73  to correspond to the each pixel, and on-chip micro lenses  75  are formed on the on-chip color filters  74 . In this way, the back-illuminated solid-state imaging device  28  is formed. The link conductor  71  of the connection wiring  67  exposed to the outside serves as an electrode pad connected to an external wiring by a bonding wire. 
       Exemplary Method of Manufacturing Solid-State Imaging Device 
       [0110]      FIGS. 4 to 14  are diagrams illustrating one embodiment of a method of manufacturing the solid-state imaging device  28  according to the first embodiment. As shown in  FIG. 4 , partly-finished image sensors, that is, the pixel array  23  and the control circuit  24  are formed in the regions of a first semiconductor wafer (hereinafter, referred to as a semiconductor substrate)  31 , where the respective chip sections are formed. That is, a photodiode (PD) serving as a photoelectric conversion unit of each pixel is formed in each region of the semiconductor substrate (such as a silicon substrate)  31  where the chip section is formed, and a source/drain region  33  of each pixel transistor is formed in a semiconductor well region  32 . The semiconductor well region  32  is formed by implanting first conductive-type impurities such as p-type impurities. The source/drain region  33  is formed by implanting second conductive-type impurities such as n-type impurities. The photodiode (PD) and the source/drain region  33  of each pixel transistor are formed by implanting ions from the front surface of the semiconductor substrate. 
         [0111]    The photodiode (PD) includes an n-type semiconductor region  34  and a p-type semiconductor region  35  on the side of the front surface of the semiconductor substrate. A gate electrode  36  is formed on the front surface of the semiconductor substrate, in which the pixel is formed, via a gate insulation film. The gate electrode  36  and a pair of source/drain regions  33  form the pixel transistors Tr 1  and Tr 2 . In  FIG. 4 , the two pixel transistors Tr 1  and Tr 2  are representatives of a plurality of pixel transistors. The pixel transistor Tr 1  adjacent to the photodiode (PD) corresponds to a transfer transistor and the source/drain region of the pixel transistor Tr 1  corresponds to a floating diffusion (FD). The unit pixels  30  are isolated from each other by a device isolation region  38 . The device isolation region  38  is formed to have an STI (Shallow Trench Isolation) structure in which an insulation film such as a SiO 2  film is buried in a groove formed in the substrate. 
         [0112]    On the other hand, the MOS transistors forming the control circuit are formed in the semiconductor substrate  31  on the side of the control circuit  24 . In  FIG. 4 , the MOS transistors Tr 3  and Tr 4  are representatives of the transistors and indicate the MOS transistors forming the control circuit  23 . The MOS transistors Tr 3  and Tr 4  each include an n-type source/drain region  33  and a gate electrode  36  formed via a gate insulation film. 
         [0113]    Next, the interlayer insulation film  39  of a first layer is formed on the front surface of the semiconductor substrate  31 , the connection holes are formed in the inter-layer insulation film  39 , and then the connection conductors  44  connected to the necessary transistors are formed. When the connection conductors  44  with different heights are formed, a first insulation thin film  43   a , such as a silicon oxide film, and a second insulation thin film  43   b , such as a silicon nitride film serving as an etching stopper, are stacked on the entire surface including the upper surface of the transistors. The first-layer inter-layer insulation film  39  is formed on the second insulation thin film  43   b . Then, connection holes with different depths are selectively formed in the first-layer inter-layer insulation film  39  up to the second insulation thin film  43   b  serving as the etching stopper. Next, the first insulation thin film  43   a  and the second insulation thin film  43   b  with the same thickness are selectively etched in the respective units to form connection holes so as to continue with the respective connection holes. Then, the connection conductor  44  is buried in each connection hole. 
         [0114]    Next, the multi wiring layer  41  in which the plurality of wirings  40  [ 40   a ,  40   b , and  40   c ] formed by triple layered metals M 1  to M 3  are disposed is formed using an inter-layer insulation film  39  so as to be connected to the respective connection conductors  44 . The wirings  40  are formed of copper (Cu). In general, each copper wiring is covered with a barrier metal film to prevent diffusion of Cu. Thus, a cap film, a so-called protective film  42 , for the copper wirings  40  is formed on the multi wiring layer  41 . By the above-described processes, the first semiconductor substrate  31  including the partly-finished pixel array  23  and the partly-finished control circuit  24  is formed. 
         [0115]    On the other hand, as shown in  FIG. 5 , the logic circuit  25  including a partly-finished signal processing circuit to process signals is formed in the region where each chip section of the second semiconductor substrate (semiconductor wafer)  45  is formed. That is, a plurality of MOS transistors each including a logic circuit is formed in p-type semiconductor well regions  46  on the front surface side of the semiconductor substrate (such as a silicon substrate)  45  so as to be isolated from each other by device isolation regions  50 . Here, the MOS transistors Tr 6 , Tr 7 , and Tr 8  are representatives of the plurality of MOS transistors. The MOS transistors Tr 6 , Tr 7 , and Tr 8  each include a pair of n-type source/drain regions  47  and a gate electrode  48  formed via a gate insulation film. The logic circuit  25  can include a CMOS transistor. The device isolation region  50  is formed to have an STI (Shallow Trench Isolation) structure in which an insulation film such as a SiO 2  film is buried in a groove formed in the substrate. 
         [0116]    Next, a first-layer inter-layer insulation film  49  is formed on the front surface of the semiconductor substrate  45  and then connection holes are formed in the inter-layer insulation film  49  to form connection conductors  54  connected to the necessary transistors. When the connection conductors  54  with different heights are formed, like the above description, a first insulation thin film  43   a , such as a silicon oxide film, and a second insulation thin film  43   b , such as a silicon nitride film, serving as an etching stopper are stacked on the entire surface including the upper surface of the transistors. The first-layer inter-layer insulation film  49  is formed on the second insulation thin film  43   b . Then, the connection holes with different depths are selectively formed in the first inter-layer insulation film  39  up to the second insulation thin film  43   b  serving as the etching stopper. Next, the first insulation thin film  43   a  and the second insulation thin film  43   b  with the same thickness are selectively etched in the respective units to form connection holes so as to continue with the respective connection holes. Then, the connection conductor  44  is buried in each connection hole. 
         [0117]    Next, a multi wiring layer  55  in which the plurality of wirings  53  [ 53   a ,  53   b , and  53   c ] formed by triple layered metals M 11  to M 13  are disposed is formed using an inter-layer insulation film  49  so as to be connected to the respective connection conductors  54 . The wirings  53  are formed of copper (Cu). Like the above description, a cap film, a so-called protective film  56 , for the copper wirings  53  is formed on the inter-layer insulation film  49 . By the above-described processes, the second semiconductor substrate  45  including the partly-finished logic circuit  25  is formed. 
         [0118]    Next, as shown in  FIG. 6 , the first semiconductor substrate  31  and the second semiconductor substrate  45  are bonded to each other so that the multi wiring layers  41  and  55  face each other. The first and second semiconductor substrates can be bonded by plasma joining or an adhesive. The first and second semiconductor substrates are bonded by an adhesive. When an adhesive is used, as shown in  FIG. 7 , an adhesive layer  58  is formed on one of the joining surfaces of the first semiconductor substrate  31  and the second semiconductor substrate  45 . Both the semiconductor substrates are superimposed to each other with the adhesive layer  58  interposed therebetween. That is, the first semiconductor substrate  31  and the second semiconductor substrate  45  are bonded to each other. 
         [0119]    When the first semiconductor substrate and the second semiconductor substrate are bonded by plasma joining, although not illustrated, a plasma TEOS film, a plasma SiN film, a SiON film (block film), a SiC film, or the like is formed on the joining surfaces of the first semiconductor wafer  31  and the second semiconductor wafer  45 . The joining surfaces on which this film is formed are subjected to plasma processing to be superimposed, and then the both joining surfaces are adhered by annealing. Preferably, the first and second semiconductor wafers are bonded at a low temperature of 400° C. or less at which the wirings or the like are not influenced. 
         [0120]    Next, as shown in  FIG. 8 , grinding and polishing are performed from the rear surface  31   b  of the first semiconductor substrate  31  to thin the first semiconductor substrate  31 . The thinning is performed so that the photodiode (PD) is faced. After the thinning, a p-type semiconductor layer is formed on the rear surface of the photodiode (PD) to prevent dark current. The semiconductor substrate  31  has about a thickness of 600 μm, but is thinned from about 3 μm to about 5 μm. In a related art, a separate support substrate is bonded for the thinning. In this embodiment, however, the second semiconductor substrate  45  including the logic circuit  25  also serves as a support substrate so that the first semiconductor substrate  31  is thinned. The rear surface  31   b  of the first semiconductor substrate  31  is a light incident surface of the back-illuminated solid-state imaging device. 
         [0121]    Next, in the first semiconductor substrate  31  and the second semiconductor substrate  45  bonded to each other, as shown in  FIG. 9 , the part of a semiconductor portion of the region of the finished first semiconductor chip section, that is, the part of the semiconductor substrate  31 , is completely removed to form the semiconductor removal region  52 . The semiconductor removal region  52  covers all regions including a part where each connection wiring connected to the laying wiring  40   d  corresponding to each vertical signal line of the pixel array is formed, and is formed outside the pixel array  23 , as shown in  FIG. 15B . In  FIG. 15B , the semiconductor removal region  52  is formed outside the pixel array  23  in a vertical direction. 
         [0122]    Next, as shown in  FIG. 10 , a stacked insulation film  61  including a silicon oxide (SiO 2 ) film  58  and a silicon nitride (SiN) film  59  is formed and adhered across the rear surface (light incident surface) of the control circuit  24  and the pixel array  23  from the internal surface of the semiconductor removal region  52 . The stacked insulation film  61  serves as a protective film of the semiconductor side surface of the semiconductor removal region  52  and also serves as an anti-reflection film for the pixel array  23 . 
         [0123]    Next, as shown in  FIG. 11 , the through connection hole  62  formed from the stacked insulation film  61  to the second connection pad  63 , which is connected to the necessary wiring  53  for the multi wiring layer  55  of the second semiconductor substrate  45 , through the multi wiring layer  41  of the first semiconductor substrate  31  is formed in the semiconductor removal region  52 . The through connection hole  62  reaches the second connection pad  63  electrically connected to the wiring  53   d  formed by the uppermost layer of the multi wiring layer, that is, the third-layer metal M 13 . The plurality of through connection holes  62  are formed to correspond in number to the vertical signal lines of the pixel array  23 . The wiring  53   d  formed by the third-layer metal M 13  connected to the second connection pad  63  serves as the laying wiring corresponding to the vertical signal line. As an illustrated example, the second connection pad  63  is formed by the third-layer metal M 13  and is formed so as to continue with the laying wiring  53   d  corresponding to the vertical signal line. 
         [0124]    Next, as shown in  FIG. 12 , the connection hole  64  formed from the stacked insulation film  61  to the first connection pad  65 , which is connected to the necessary wiring  40  for the multi wiring layer  41  of the first semiconductor substrate  31 , is formed in the semiconductor removal region  52 . In this example, the connection hole  64  reaching the first connection pad  65  electrically connected to the wiring  40   d  formed by the third-layer metal M 3  of the multi wiring layer  41  is formed. The plurality of connection holes  64  are formed to correspond in number to the vertical signal lines of the pixel array  23 . The wiring  40   d  formed by the third-layer metal M 3  connected to the first connection pad  65  serves as the laying wiring corresponding to the vertical signal line. In the illustrated example, the first connection pad  65  is formed by the third-layer metal M 3  and is formed so as to continue with the laying wiring  40   d  corresponding to the vertical signal line. 
         [0125]    Next, as shown in  FIG. 13 , the connection wiring  67  is formed to electrically connect the first connection pad  65  to the second connection pad  63 . That is, a conductive film is formed on the entirety of the rear surface of the first semiconductor substrate  31  so as to be buried in both the connection holes  62  and  64 , and then is subjected to etch-back and patterning to form the connection wiring  67 . The connection wiring  67  includes the connection conductor  68  buried in the connection hole  64  and connected to the first connection pad  65  and the through connection conductor  69  buried in the through connection hole  62  and connected to the second connection pad. The connection wiring  67  further includes the link conductor  71  electrically linking the connection conductor  68  to the through connection conductor  69  on the exposed bottom surface of the semiconductor removal region. The connection conductor  68 , the through connection conductor  69 , and the link conductor  71  are integrally formed of the same metal. The connection wiring  67  can be formed of metal, such as tungsten (W), aluminum (Al), or gold (Au), which can be patterned, via barrier metal (TiN or the like). 
         [0126]    Next, as shown in  FIG. 14 , the light-shielding film  72  is formed in the region where light has to be shielded. The light-shielding film  72  is formed on the control circuit  24 , as schematically illustrated in the drawing. Alternatively, the light-shielding film  72  may be also formed on the pixel transistors. The light-shielding film  72  can be formed of metal such as tungsten (W). The planarization film  73  is formed across the pixel array  23  so as to cover the light-shielding film  72 . Such as, but not limited to, red (R), green (G), and blue (B) on-chip color filters  74  are formed on the planarization film  73  so as to correspond to the respective pixels, and then the on-chip micro lenses  75  are formed on the on-chip color filters  74 . The pixel array  23  and the control circuit  25  are finished for the first semiconductor substrate  31 . The link conductor  71  of the connection wiring  67  serves as an electrode pad exposed to the outside. The logic circuit  25  is finished for the second semiconductor substrate  45 . 
         [0127]    Next, the divided individual chips are obtained, and thus the desired back-illuminated solid-state imaging device  28  shown in  FIG. 3  is obtained. In the solid-state imaging device  28 , the electrode pad formed by the link conductor  71  of the connection wiring  67  is connected to an external wiring by wire bonding. 
         [0128]    In the solid-state imaging device and the method of manufacturing the same according to the first embodiment, the pixel array  23  and the control circuit  24  are formed in the first semiconductor chip section  22  and the logic circuit  25  processing signals is formed in the second semiconductor chip section  26 . Since the solid-state imaging device has a configuration in which the pixel array function and the logic function are realized in the different chip sections, the optimum processing techniques of the pixel array  23  and the logic circuit  25  can be used. Accordingly, the performances of the pixel array  23  and the logic circuit  25  can be sufficiently achieved, thereby providing the high-performance solid-state imaging device. 
         [0129]    In this embodiment, the part of the first semiconductor chip section  22 , that is, the semiconductor portion of the region where the connection conductor and the through connection conductor are formed is completely removed. Since the connection conductor  68  and the through connection conductor  69  are formed in the semiconductor removal region  52  where the semiconductor portion is removed, parasitic capacitance between the semiconductor substrate  31  and the connection conductor  68  and the through connection conductor  69  can be reduced, thereby realizing high performance in the solid-state imaging device. 
         [0130]    When the configuration shown in  FIG. 2C  is used, the pixel array  23  receiving light may be formed on the first semiconductor chip section  22 , and the control circuit  24  and the logic circuit  25  may be separated from each other to be formed in the second semiconductor chip section  26 . Accordingly, the optimum processing techniques can be independently selected when the semiconductor chip sections  22  and  26  are manufactured, and the area of the product module can be reduced. 
         [0131]    In the first embodiment, the first semiconductor substrate  31  including the pixel array  23  and the control circuit  24  and the second semiconductor substrate  45  including the logic circuit  25 , which are all partly-finished products, are bonded to each other, and then the first semiconductor substrate  31  is thinned. That is, the second semiconductor substrate  45  is used as the support substrate when the first semiconductor substrate  31  is thinned. Accordingly, the number of members can be reduced and the manufacturing process can be simplified. 
         [0132]    In this embodiment, the first semiconductor substrate  31  is thinned and the through connection hole  62  and the connection hole  64  are formed in the semiconductor removal region  52  where the semiconductor portion is further removed. Therefore, the aspect ratio of the holes is reduced, thereby forming the connection holes  62  and  64  with high precision. Accordingly, the high-performance solid-state imaging device can be manufactured with high precision. 
         [0133]      FIG. 16  is a diagram illustrating one embodiment of a semiconductor device, that is, a MOS solid-state imaging device that is consistent with the present invention. In the second embodiment, a solid-state imaging device  78  includes the stacked semiconductor chip  27  in which the first semiconductor chip section  22  including the pixel array  23  and the control circuit  24  and the second semiconductor chip section  26  including the logic circuit  25  are bonded to each other. The first semiconductor chip section  22  and the second semiconductor chip section  26  are bonded to each other so that multi wiring layers  41  and  55  face each other. 
         [0134]    In this embodiment, the semiconductor removal region  52 , where a part of a semiconductor portion of the first semiconductor chip section  22  is entirely removed, is formed and the stacked insulation film  61  extending from the internal surface of the semiconductor removal region  52  to the rear surface  31   b  of the semiconductor substrate  31  is formed. An insulation film  77  subjected to planarization and thus flush with the front surface of the stacked insulation film on the semiconductor substrate  31  is formed in the semiconductor removal region. The etching rate of the insulation film  77  is different from that of the silicon nitride film  59  on the front surface of the stacked insulation film  61 . The insulation film  77  is formed of, such as, but not limited to, a silicon oxide film. 
         [0135]    Then, the connection hole  64  and the through connection hole  62  reaching the first connection pad  65  and the second connection pad  63 , respectively, through the insulation film  77  are formed. The connection wiring  67  connecting the first connection pad  65  to the second connection pad  63  through both the connection holes  64  and  62  is formed. The connection wiring  67  includes the connection conductor  68  buried in the connection holes  64  and  62  and electrically connected to the first connection pad  65 , the through connection conductor  69  electrically connected to the second connection pad  63 , and the link conductor  71  electrically connecting both of the conductors  68  and  69  to each other in the upper end. The connection conductor  68 , the through connection conductor  69 , and the link conductor  71  are integrally and necessarily formed of metal. The link conductor  71  is formed on the insulation film  77  subjected to planarization. 
         [0136]    The other configuration is the same as the above-described configuration of the first embodiment. Therefore, the same reference numerals are given to the corresponding members in  FIG. 3  and repetition of the description thereof is omitted. 
         [0137]      FIGS. 17 to 24  are diagrams illustrating one embodiment of a method of manufacturing the solid-state imaging device  78  according to the second embodiment. 
         [0138]      FIG. 17  is a diagram illustrating the same configuration as that in  FIG. 10  in the steps of manufacturing the solid-state imaging device  28  according to the above-described first embodiment. Since the steps of  FIG. 17  are the same as the steps of  FIGS. 4 to 10  described above, a detailed description thereof is omitted. 
         [0139]    In the steps of  FIG. 17 , the stacked insulation film  61  including the silicon oxide (SiO 2 ) film  58  and the silicon nitride (SiN) film  59  is formed and adhered across the rear surface (light incident surface) of the control circuit  24  and the pixel array  23  from the internal surface of the semiconductor removal region  52 . 
         [0140]    Next, as shown in  FIG. 18 , the insulation film  77  such as a silicon oxide film is stacked on the entirety of the rear surface of the semiconductor substrate  31  to bury the inside of the semiconductor removal region  52 . 
         [0141]    Next, as shown in  FIG. 19 , the insulation film  77  is polished by a chemical mechanical polishing (CMP) method until the insulation film  77  has a necessary thickness. 
         [0142]    Next, as shown in  FIG. 20 , the insulation film  77  is etched up to the silicon nitride film  59  by a wet etching method using hydrofluoric acid, and is subjected to planarization so as to be flush with the silicon nitride film  59 . At this time, the silicon nitride film  59  serves as an etching stopper. 
         [0143]    Next, as shown in  FIG. 21 , the through connection hole  62  penetrated through the insulation film  77  the multi wiring layer  41  and reaching the second connection pad  63 , which is connected to the necessary wiring  53   d  for the multi wiring layer  55  of the second semiconductor substrate  45 , is formed in the semiconductor removal region  52 . The through connection hole  62  reaches the second connection pad  63  electrically connected to the wiring  53   d  formed by the uppermost layer of the multi wiring layer  55 , that is, the third-layer metal M 13  like the above description. The plurality of through connection holes  62  are formed to correspond in number to the vertical signal lines of the pixel array  23 . The wiring  53   d  formed by the third-layer metal M 13  connected to the second connection pad  63  serves as the laying wiring corresponding to the vertical signal line. As an illustrated example, the second connection pad  63  is formed by the third-layer metal M 13  and is formed so as to continue with the laying wiring  53   d  corresponding to the vertical signal line. 
         [0144]    Next, as shown in  FIG. 22 , the connection hole  64  formed from the insulation film  77  to the first connection pad  65  is formed in the semiconductor removal region  52 . The connection hole  64  reaches the second connection pad  65  electrically connected to the wiring  40   d  formed by the third-layer metal M 3  of the multi wiring layer  41 . The plurality of connection holes  64  are formed to correspond in number to the vertical signal lines of the pixel array  23 . The wiring  40   d  formed by the third-layer metal M 3  connected to the first connection pad  65  serves as the laying wiring corresponding to the vertical signal line. As anillustrated example, the first connection pad  65  is formed by the third-layer metal M 3  and is formed so as to continue with the laying wiring  40   d  corresponding to the vertical signal line. 
         [0145]    Next, as shown in  FIG. 23 , the connection wiring  67  is formed to electrically connect the first connection pad  65  to the second connection pad  63 . That is, a conductive film is formed on the entirety of the rear surfaces of the insulation film  77  and the first semiconductor substrate  31  so as to be buried in both the connection holes  62  and  64 , and then is subjected to etch-back and patterning to form the connection wiring  67 . The connection wiring  67  includes the connection conductor  68  buried in the connection hole  64  and connected to the first connection pad  65  and the through connection conductor  69  buried in the through connection hole  62  and connected to the second connection pad. The connection wiring  67  further includes the link conductor  71  electrically linking the connection conductor  68  to the through connection conductor  69  on the insulation film  77  subjected to planarization. The connection conductor  68 , the through connection conductor  69 , and the link conductor  71  are integrally formed as the conductive film using the same metal film. The connection wiring  67  can be formed of metal, such as tungsten (W), aluminum (Al), or gold (Au), which can be patterned, via barrier metal (TiN or the like). 
         [0146]    Next, as shown in  FIG. 24 , the light-shielding film  72  is formed in the region where light has to be shielded. The light-shielding film  72  is formed on the control circuit  24 , as schematically illustrated in the drawing. Alternatively, the light-shielding film  72  may be also formed on the pixel transistors. The light-shielding film  72  can be formed of metal such as tungsten (W). The planarization film  73  is formed across the pixel array  23  so as to cover the light-shielding film  72 . Such as, but not limited to, red (R), green (G), and blue (B) on-chip color filters  74  are formed on the planarization film  73  so as to correspond to the respective pixels, and then the on-chip micro lenses  75  are formed on the on-chip color filters  74 . The pixel array  23  and the control circuit  25  are finished for the first semiconductor substrate  31 . The link conductor  71  of the connection wiring  67  serves as an electrode pad exposed to the outside. The logic circuit  25  is finished for the second semiconductor substrate  45 . 
         [0147]    Next, the individual divided chips are obtained, and thus the desired back-illuminated solid-state imaging device  78  shown in  FIG. 16  is obtained. 
         [0148]    In the solid-state imaging device  78  and the method of manufacturing the same according to the second embodiment, the part of the first semiconductor chip section  22 , that is, the semiconductor portion of the region where the connection conductor  68  and the through connection conductor  69  are formed is completely removed, the insulation film  77  is buried in the removed semiconductor removal region  52 . Since the connection conductor  68  and the through connection conductor  69  are buried in the connection hole  64  and the through connection hole  62  formed in the insulation film  77 , the connection conductors  68  and  69  are distant from the side surface of the semiconductor substrate  31  by the insulation film  77 , thereby reducing the parasitic capacitance between the connection conductors  68  and  69  and the semiconductor substrate  31 . Since the inside of the semiconductor removal region  52  is buried by the insulation film  77 , the surface of the semiconductor substrate  31  facing the side wall of the semiconductor removal region  52  can be reliably protected mechanically in cooperation with the stacked insulation film  61 . Accordingly, high performance in the solid-state imaging device can be realized. 
         [0149]    In this embodiment, the first semiconductor substrate  31  is thinned and the through connection hole  62  and the connection hole  64  are formed. Therefore, the aspect ratio of the holes is reduced, thereby forming the connection holes  62  and  64  with high precision. Accordingly, the high-performance solid-state imaging device can be manufactured with high precision. 
         [0150]    Further description is omitted, but the same advantages as those of the first embodiment can be obtained. 
         [0151]      FIG. 25  is a diagram illustrating a semiconductor device, that is, a MOS solid-state imaging device according to a third embodiment of the invention. In the third embodiment, a solid-state imaging device  82  includes the stacked semiconductor chip  27  in which the first semiconductor chip section  22  including the pixel array  23  and the control circuit  24  and the second semiconductor chip section  26  including the logic circuit  25  are bonded to each other. The first semiconductor chip section  22  and the second semiconductor chip section  26  are bonded to each other so that multi wiring layers  41  and  55  face each other. 
         [0152]    In this embodiment, the semiconductor removal region  52 , where a part of a semiconductor portion of the first semiconductor chip section  22  is entirely removed, is formed and the stacked insulation film  61  extending from the internal surface of the semiconductor removal region  52  to the rear surface of the semiconductor substrate  31  is formed. An insulation film  77  subjected to planarization and thus flush with the front surface of the stacked insulation film  61  on the semiconductor substrate  31  is formed in the semiconductor removal region  52 . A concave portion  81  with a necessary depth is formed from the front surface in the portion corresponding to the connection wiring  67  of the insulation film  77 . The etching rate of the insulation film  77  is different from that of the silicon nitride film  59  on the front surface of the stacked insulation film  61 . The insulation film  77  is formed of such as, but not limited to, a silicon oxide film. 
         [0153]    Then, the connection hole  64  and the through connection hole  62  penetrated through the insulation film  77  below the concave portion  81  and reaching the first connection pad  65  and the second connection pad  63 , respectively, are formed. The connection wiring  67  connecting the first connection pad  65  to the second connection pad  63  through both the connection holes  62  and  64  is formed. The connection wiring  67  includes the connection conductor  68  buried in the connection holes  64  and  62  and electrically connected to the first connection pad  65 , the through connection conductor  69  electrically connected to the second connection pad  63 , and the link conductor  71  electrically connecting both of the conductors  68  and  69  to each other in the upper stage. The connection conductor  68 , the through connection conductor  69 , and the link conductor  71  are integrally and necessarily formed of metal. The link conductor  71  is buried in the concave portion  81  of the insulation film  77 . The front surface of the link conductor  71  is flush with the front surface of the insulation film  77 . 
         [0154]    The other configuration is the same as the above-described configuration of the first embodiment. Therefore, the same reference numerals are given to the corresponding members in  FIG. 3  and repetition of the description thereof is omitted. 
       Exemplary Method of Manufacturing Solid-State Imaging Device 
       [0155]      FIGS. 26 to 30  are diagrams illustrating a method of manufacturing the solid-state imaging device  82  according to the third embodiment. 
         [0156]      FIG. 26  is a diagram illustrating the same configuration as that in  FIG. 20  in the steps of manufacturing the solid-state imaging device  78  according to the above-described second embodiment. Since the steps of  FIG. 26  are the same as the steps of  FIGS. 4 to 10  and the steps of  FIGS. 17 to 20  described above, a detailed description thereof is omitted. 
         [0157]    In the step of  FIG. 26 , the insulation film  77  is stacked so as to be buried in the semiconductor removal region  52 , and then the front surface of the insulation film  77  is subjected to planarization by chemical mechanical polishing (CMP) and wet etching so as to be flush with the front surface of the stacked insulation film  61 . 
         [0158]    Next, as shown in  FIG. 27 , the concave portion  81  with the necessary depth from the front surface is formed on the front surface of the insulation film  77  to correspond to the region of the connection wiring  67 . 
         [0159]    Next, as shown in  FIG. 28 , the through connection hole  62  penetrated through the insulation film  77  below the concave portion  81  and the multi wiring layer  41  and reaching the second connection pad  63  is formed. The through connection hole  62  reaches the second connection pad  63  electrically connected to the wiring  53   d  formed by the uppermost layer of the multi wiring layer  55  of the second semiconductor chip section  26 , that is, the third-layer metal M 13  like the above description. The plurality of through connection holes  62  are formed to correspond in number to the vertical signal lines of the pixel array  23 . The wiring  53   d  connected to the second connection pad  63  serves as the laying wiring corresponding to the vertical signal line. As an illustrated example, the second connection pad  63  is formed by the third-layer metal M 13  and is formed so as to continue with the laying wiring  53   d  corresponding to the vertical signal line. 
         [0160]    Then, the connection hole  64  formed from the insulation film  77  below the concave portion  81  to the first connection pad  65  is formed in the semiconductor removal region  52 . The connection hole  64  reaches the second connection pad  65  electrically connected to the wiring  40   d  formed by the third-layer metal M 3  of the multi wiring layer  41  of the first semiconductor chip section  22 . The plurality of connection holes  64  are formed to correspond in number to the vertical signal lines of the pixel array  23 . The metal wiring  40   c  formed by the third-layer metal M 3  connected to the first connection pad  65  serves as the laying wiring corresponding to the vertical signal line. As an illustrated example, the first connection pad  65  is formed by the third-layer metal M 3  and is formed so as to continue with the laying wiring  40   d  corresponding to the vertical signal line. 
         [0161]    Next, as shown in  FIG. 29 , the connection wiring  67  is formed to electrically connect the first connection pad  65  to the second connection pad  63 . That is, a conductive film is formed on the entirety of the rear surfaces of the insulation film  77  and the first semiconductor substrate  31  so as to be buried in the concave portion  81  and both the connection holes  62  and  64 , and then is subjected to etch-back to form the connection wiring  67 . The connection wiring  67  includes the connection conductor  68  buried in the connection hole  64  and connected to the first connection pad  65  and the through connection conductor  69  buried in the through connection hole  62  and connected to the second connection pad. The connection wiring  67  further includes the link conductor  71  electrically linking the connection conductor  68  to the through connection conductor  69 . The link conductor  71  is subjected to planarization to be buried in the concave portion  81  and be flush with the front surface of the insulation film  77 . The connection conductor  68 , the through connection conductor  69 , and the link conductor  71  are integrally formed as the conductive film using the same metal. The connection wiring  67  can be formed of copper (Cu), since the connection wiring  67  is formed by etch-back. The link conductor  71  can be formed of metal, such as tungsten (W), aluminum (Al), or gold (Au), which can be patterned, via barrier metal (TiN or the like). 
         [0162]    Next, as shown in  FIG. 30 , the light-shielding film  72  is formed in the region where light has to be shielded. The light-shielding film  72  is formed on the control circuit  24 , as schematically illustrated in the drawing. Alternatively, the light-shielding film  72  may be also formed on the pixel transistors. The light-shielding film  72  can be formed of metal such as tungsten (W). The planarization film  73  is formed across the pixel array  23  so as to cover the light-shielding film  72 . Such as, but not limited to, red (R), green (G), and blue (B) on-chip color filters  74  are formed on the planarization film  73  so as to correspond to the respective pixels, and then the on-chip micro lenses  75  are formed on the on-chip color filters  74 . The pixel array  23  and the control circuit  25  are finished for the first semiconductor substrate  31 . The link conductor  71  of the connection wiring  67  serves as an electrode pad exposed to the outside. The logic circuit  25  is finished for the second semiconductor substrate  45 . 
         [0163]    Next, the divided individual chips are obtained, and thus the desired back-illuminated solid-state imaging device  82  shown in  FIG. 25  is obtained. 
         [0164]    In the solid-state imaging device and the method of manufacturing the same according to the third embodiment, the part of the first semiconductor chip section  22 , that is, the semiconductor portion of the region where the connection conductor  68  and the through connection conductor  69  are formed is completely removed, the insulation film  77  is buried in the removed semiconductor removal region  52 . The concave portion  81  is formed in the insulation film  77 , and the connection conductor  68  and the through connection conductor  69  are buried in the connection hole  64  and the through connection hole  62  formed in the insulation film  77  below the concave portion  81 . Accordingly, both the connection conductors  68  and  69  are distant from the side surface of the semiconductor substrate  31  by the insulation film  77 , thereby reducing the parasitic capacitance between the connection conductors  68  and  69  and the semiconductor substrate  31 . Since the inside of the semiconductor removal region  52  is buried by the insulation film  77 , the surface of the semiconductor substrate  31  facing the side wall of the semiconductor removal region  52  can be reliably protected mechanically in cooperation with the stacked insulation film  61 . Accordingly, high performance in the solid-state imaging device can be realized. 
         [0165]    Since the link conductor  71  is buried in the concave portion  81  of the insulation film  77  and the link conductor  71  is subjected to planarization so as to be flush with the front surface of the insulation film  77 , the solid-state imaging device with a small uneven surface can be obtained. 
         [0166]    In the third embodiment, the first semiconductor substrate  31  is thinned, the concave portion  81  is formed in the insulation film  77 , and the through connection hole  62  and the connection hole  64  are formed. Therefore, the aspect ratio of the holes is reduced, thereby forming the connection holes  62  and  64  with high precision. Accordingly, the high-performance solid-state imaging device can be manufactured with high precision. 
         [0167]    Further description is omitted, but the same advantages as those of the first embodiment can be obtained. 
         [0168]    In the second and third embodiments, the configuration in  FIG. 2C  can be used. 
         [0169]    In the above-described embodiments, the two semiconductor chips  22  and  26  are bonded to each other. The solid-state imaging device according to the embodiment of the invention may be configured by bonding two or more semiconductor chip sections to each other. Even in the configuration in which two or more semiconductor chip sections are bonded to each other, the above-described configuration in which the semiconductor portion is completely removed is applied to the connection portion in which the first semiconductor chip section  22  having the pixel array  23  and the second semiconductor chip section  26  having the logic circuit  25  processing signals. 
         [0170]    In the configuration in which the above-described semiconductor chip sections are bonded to each other, parasitic capacitance such as pair ground capacitance or pair adjacent coupling capacitance occurs. In particular, since the connection conductor  68  and the through connection conductor  69  have a large surface area, it is preferable to reduce the adjacent coupling capacitance between the connection conductors of the adjacent lines or the laying wirings of the adjacent lines. Here, the portion between the connection conductors indicates a portion between the connection conductors of the adjacent pairs when the connection conductor  68  and the through connection conductor  69  are paired. On the other hand, since the area and pitch of the first connection pad  65  and the area and pitch of the second connection pad  63  are larger than the pixel area and the pixel pitch, a practically obtainable layout is preferable. 
         [0171]    Next, embodiments in which the practically obtainable layout is realized to reduce the pair adjacent coupling capacitance will be described. 
         [0172]      FIGS. 31 to 35  are diagrams illustrating a semiconductor device, that is, a MOS solid-state imaging device according to a fourth embodiment of the invention. In the drawings, only the layout of the wiring connection portion including the connection pads electrically connecting the first and second semiconductor chip sections to each other is shown.  FIG. 31  is a plan view illustrating a connection pad array.  FIG. 32  is a sectional view taken along the line XXXII-XXXII of  FIG. 31 .  FIG. 33  is a sectional view taken along the line XXXIII-XXXIII of  FIG. 31 .  FIGS. 34 and 35  are exploded plan views of  FIG. 31 . 
         [0173]    In a solid-state imaging device  84  according to the fourth embodiment, like the above description, two semiconductor chip sections  22  and  26  are bonded to each other, the part of a semiconductor portion of the first semiconductor chip section  22  is removed, and both the semiconductor chip sections  22  and  26  are connected to each other through the connection wiring  67  in the semiconductor removal region  52 . In this embodiment, since the several configurations of the above-described embodiments are applicable to the other configuration excluding the layout of the wiring connection portion, a detailed description thereof is omitted. 
         [0174]    In the fourth embodiment, the wirings  40  [ 40   a ,  40   b ,  40   c , and  40   d ] of the multi wiring layer  41  in the first semiconductor chip section  22  are formed by a plurality of layers by four-layer metals. The first connection pad  65  is formed by the first-layer metal, and the laying wiring  40   d  corresponding to the vertical signal line is formed by the metal subsequent to the second-layer metal. The laying wiring  40   d  corresponding to the vertical signal line is formed by the fourth-layer metal. The wirings  53  [ 53   a ,  53   b ,  53   c , and  53   d ] of the multi wiring layer  55  in the second semiconductor chip section  26  are formed by a plurality of layers by four-layer metals. The second connection pad  63  is formed by the metal subsequent to the second-layer metal the third-layer metal or the fourth-layer metal. The second connection pad  63  is formed by the fourth-layer metal. The laying wiring  53   d  corresponding to the vertical signal line is formed by the first-layer metal. In the first semiconductor chip section  22 , the first connection pad  65  formed by the first-layer metal is electrically connected to the laying wiring  40   d  formed by the fourth-layer metal via a connection portion  85  and a via conductor  86  respectively formed by the second-layer metal and the third-layer metal. In the second semiconductor chip section  26 , the second connection pad  63  formed by the fourth-layer metal is electrically connected to the laying wiring  53   d  formed by the first-layer metal via a connection portion  87  and a via conductor  88  respectively formed by the third-layer metal and the second-layer metal. 
         [0175]    The second connection pad  63  is formed to have an area larger than that of the first connection pad  65  in consideration of the difference between the positions at which the first semiconductor chip section  22  and the second semiconductor chip section  26  are bonded to each other. A pair of first connection pad  65  and second connection pad  63  is collectively called a connection pad pair  89 . 
         [0176]    The first connection pad  65  and the second connection pad  63  have an octagonal shape in a plan view, and preferably have a regular octagonal shape. The first and second connection pads of the connection pad pair  89  are arranged in a horizontal direction. The plurality of connection pad pairs  89  is arranged in the horizontal direction in which the laying wirings  40   d  and  53   d  of the respective lines are arranged. On the other hand, a plurality of stages, in this embodiment, four stages of the connection pad pairs  89 , is arranged in the vertical direction. That is, in the wiring connection portion of both the semiconductor chip sections  22  and  26 , the first connection pads  65  and the second connection pads  63  with the regular octagonal shape are alternately arranged in the horizontal and vertical directions. Here, the plurality of connection pad pairs  89  is arranged in the horizontal direction and four stages of the connection pad pairs  89  are arranged in the vertical direction to configure a connection pad array  91 . Here, the octagonal shape is defined. The octagonal first connection pad  65  may integrally have a connection protrusion portion  65   a  protruding in part, since the octagonal first connection pad  65  is connected to the laying wiring  40   d  (see  FIG. 32 ). In this case, the shape slightly protrudes in terms of the entire octagonal shape, and thus falls within the range of the octagon. 
         [0177]    In the connection pad array  91 , the first connection pads  65  and the second connection pads  63  are densely arranged in a plan view. The first connection pads  65  and the second connection pads  63  may be arranged to partially overlap with each other. The connection conductors  68  and the through connection conductors  69  are connected to the first connection pads  65  and the second connection pads  63 , respectively, and the first semiconductor chip section  22  and the second semiconductor chip section  26  are electrically connected to each other via the connection wirings  67  each including the link conductor  71  linking both the connection conductors  68  and  69  to each other. The connection conductor  68  and the through connection conductor  69  may be formed to have the same octagonal shape as the planar shape of the connection pads  65  and  63  corresponding to the cross-section shapes of the connection conductor  68  and the through connection conductor  69 . The connection wiring  67  is formed in the same way as that of the third embodiment. That is, the insulation film  77  is buried in the semiconductor removal region  52 , the connection conductor  65  and the through connection conductor  63  are penetrated through the insulation film  77 , the front surface of the link conductor  71  is subjected to planarization so as to be flush with the front surface of the insulation film  77 . 
         [0178]    In this embodiment, the laying wirings  40   d  and  53   d  each corresponding to four vertical signal lines are connected to the first connection pads  65  and the second connection pads  63  of the four-stage connection pad pairs  89 , respectively. In the first semiconductor chip section  22 , the first connection pads  65  are each formed by the first-layer metal and the laying wirings  40   d  are each formed by the fourth-layer metal. Since the laying wirings  40   d  can cross below the first connection pads  65 , the distance between the adjacent laying wirings  40   d  can be increased. Likewise, in the second semiconductor chip section  26 , the second connection pads  63  are each formed by the fourth-layer metal and the laying wirings  53   d  are each formed by the first-layer metal. Since the laying wirings  53   d  can be disposed so as to cross below the second connection pads  63 , the distance between the adjacent laying wirings  53   d  can be increased. 
         [0179]    In the solid-state imaging device  84  according to the fourth embodiment, the planar shapes of the first connection pads  65  and the second connection pads  63  are octagonal and the connection pad array  91  is formed in which the first connection pads  65  and the second connection pads  63  are alternately arranged densely in the horizontal and vertical directions. That is, the dense connection pad array  91  is formed in the wiring connection portion of both the semiconductor chip sections  22  and  26 . Since the laying wirings  40   d  and  52   d  corresponding to the vertical signal lines of four lines are connected to each of the four-stage connection pad pairs  89  of the connection pad array  91 , the distance between the adjacent laying wirings  40   d  and the distance between the adjacent laying wirings  53   d  are increased, thereby reducing the adjacent coupling capacitance. Moreover, since there is the insulation film  77  between the adjacent connection conductor pairs, the adjacent coupling capacitance between the connection conductor pairs can be reduced. 
         [0180]    A wiring resistance difference caused by the difference in the wiring length of the laying wirings of four lines is reduced in the configuration in which the pairs of first connection pads  65  and second connection pads  63  are arranged in the horizontal direction, compared to a configuration described below in which the pairs of first connection pads  65  and second connection pads  63  are arranged in the vertical direction. 
         [0181]    The area and pitch of the connection pads  65  and  63  are larger than the area and pitch of the pixels. However, in the above-described layout of the connection pads  65  and  63 , the wirings  40   d  and  53   d  can be drawn, thereby providing the high-performance solid-state imaging device. 
         [0182]    In the fourth embodiment, even when the configuration of the connection wirings  67  of the first and second embodiments is used, the adjacent coupling capacitance can be similarly reduced. 
         [0183]    In the fourth embodiment, the same advantages as those of the first to third embodiments can be obtained. 
         [0184]      FIG. 36  is a diagram illustrating a semiconductor device, that is, a MOS solid-state imaging device according to a fifth embodiment of the invention. In the drawing, only the layout of the wiring connection portion including the connection pads  65  and  63  electrically connecting the first semiconductor chip section  22  to the second semiconductor chip section  26  is shown. 
         [0185]    In a solid-state imaging device  93  according to the fifth embodiment, like the above description, two semiconductor chip sections  22  and  26  are bonded to each other, the part of a semiconductor portion of the first semiconductor chip section  22  is removed, and both the semiconductor chip sections  22  and  26  are connected to each other through the connection wiring  67  in the semiconductor removal region  52 . In this embodiment, since the several configurations of the above-described embodiments are applicable to the other configuration excluding the layout of the wiring connection portion, a detailed description thereof is omitted. 
         [0186]    In the fifth embodiment, connection pad arrays  91 A and  91 B are disposed on both outsides to face each other in the vertical direction with the pixel array  23  interposed therebetween, and the laying wirings  40   d  and  53   d  corresponding to the vertical signal lines are alternately connected to the connection pad arrays  91 A and  91 B. In this embodiment, as in  FIG. 31 , the connection pad pairs  89  in which the pairs of first connection pads  65  and second connection pads  63  are arranged in the horizontal direction are disposed in a plurality of stages in two stages. The connection pad pairs  89  of the connection pad arrays  91 A and  91 B are densely arranged. The pairs of laying wirings  40   d  and  53   d  are alternately connected at the interval of two layers to the two-stage connection pad pairs  89  of the connection pad arrays  91 A and  91 B. Both the connection pad arrays  91 A and  91 B are formed in semiconductor removal regions  52   a  and  52   b  shown in  FIG. 15B . 
         [0187]    In  FIG. 36 , the planar shapes of the connection pads  65  and  63  are octagonal, and preferably regular octagonal. However, since the distance between the wirings can be increased, the planar shapes of the connection pads may be tetragonal or hexagonal (preferably, regular hexagonal). This embodiment is applicable to the configuration described below in which the connection pad pairs  89  can be replaced by the connection pad pairs in which the first connection pads  65  and the second connection pads  63  are arranged in the vertical direction. 
         [0188]    In the solid-state imaging device  93  according to the fifth embodiment, the connection pad arrays  91 A and  91 B are disposed with the pixel array  23  interposed therebetween, and the laying wirings of the plurality of lines two lines corresponding to the vertical signal lines are alternately connected to the two-stage connection pad pairs  89  of the connection pad arrays  91 A and  91 B. With such a configuration, it is not necessary to narrow the distance between the adjacent laying wirings  40   d  and the distance between the laying wirings  53   d . In other words, the distance between the adjacent laying wirings  40   d  and the distance between the laying wirings  53   d  can be sufficiently increased. Therefore, the adjacent coupling capacitance can be reduced. Moreover, since the difference in the wiring length between the laying wirings is reduced, the wiring resistance difference can be further reduced. 
         [0189]    The area and pitch of the connection pads  65  and  63  are larger than the area and pitch of the pixels. However, in the above-described layout of the connection pads  65  and  63 , the wirings  40   d  and  53   d  can be drawn, thereby providing a high-performance solid-state imaging device. 
         [0190]    In the fifth embodiment, even when the configuration of the connection wirings of the first, second, or third embodiment is used, the adjacent coupling capacitance can be similarly reduced. 
         [0191]    In the fifth embodiment, the same advantages as those of the first to third embodiments can be obtained. 
         [0192]      FIGS. 37 and 38  are diagrams illustrating a semiconductor device, that is, a MOS solid-state imaging device according to a sixth embodiment of the invention. In the drawings, particularly, only the layout of the wiring connection portion including the connection pads  65  and  63  electrically connecting the first semiconductor chip section  22  to the second semiconductor chip section  26  is shown. 
         [0193]    In a solid-state imaging device  95  according to the sixth embodiment, like the above description, two semiconductor chip sections  22  and  26  are bonded to each other, the part of a semiconductor portion of the first semiconductor chip section  22  is removed, and both the semiconductor chip sections  22  and  26  are connected to each other through the connection wiring  67  in the semiconductor removal region  52 . In this embodiment, since the several configurations of the above-described embodiments are applicable to the other configuration excluding the layout of the wiring connection portion, a detailed description thereof is omitted. 
         [0194]    In the sixth embodiment, the connection pad array  91  in which the first connection pads  65  and the second connection pads  63  with the same regular octagonal shape shown in  FIG. 31  are alternately arranged in the horizontal and vertical directions, and the laying wirings  40   d  and  53   d  of every four lines are connected to each of the four-stage connection pad pairs  89  of the connection pad array  91 . Each first connection pad  65  in the first semiconductor chip section  22  is formed by the first-layer metal and each laying wiring  40   d  connected to the connection pad  65  is formed by the fourth-layer metal. Each second connection pad  63  in the second semiconductor chip section  26  is formed by the fourth-layer metal and each laying wiring  53   d  connected to the connection pad  63  is formed by the first-layer metal. 
         [0195]    The laying wiring  40   d  in the first semiconductor chip section  22  is disposed so as to cross below another necessary first connection pad  65  to which this laying wiring  40   d  is not connected. Since the area of the connection pad  65  is relatively large, coupling capacitance may occur between the connection pad  65  and another laying  40   d  crossing the connection pad  65  and having a different potential. In this embodiment, accordingly, a shield wiring  96  formed by the metal of the layer between the first connection pad  65  and the laying wiring  40   d  is formed between the first connection pad  65  and the necessary laying wiring  40   d . That is, the shield wiring  96  formed by the second-layer metal or the third-layer metal the second-layer metal is formed between the first connection pad  65  and the necessary laying wiring  40   d . As shown in  FIG. 38 , three laying wirings  40   d  cross below the first connection pad  65  in some cases. Therefore, the shield wirings  96  are continuously formed in the four-stage connection pad pairs  89  so as to have a width corresponding to the width of the connection pad  65 . 
         [0196]    In the solid-state imaging device according to the sixth embodiment, the shield wiring  96  disposed between the first connection pad  65  and the laying wiring  40   d  crossing below the first connection pad  65  is formed, thereby preventing the coupling capacitance from occurring between the connection pad  65  and the laying wiring  40   d  of which potentials are different. Accordingly, it is possible to provide a high-performance solid-state imaging device. 
         [0197]    In the sixth embodiment, as in the first to third embodiments, the same advantages such as the reduction in the adjacent coupling capacitance can be obtained. 
         [0198]    In the sixth embodiment, the advantage can be obtained by the shield wiring  96  irrespective of the planar shape of the connection pad  65  or the layout of the connection pad  65 . 
         [0199]      FIG. 39  is a diagram illustrating a semiconductor device, that is, a MOS solid-state imaging device according to a seventh embodiment of the invention. In the drawing, particularly, only the layout of the wiring connection portion including the connection pads  65  and  63  electrically connecting the first semiconductor chip section  22  to the second semiconductor chip section  26  is shown. 
         [0200]    In a solid-state imaging device  97  according to the seventh embodiment, like the above description, two semiconductor chip sections  22  and  26  are bonded to each other, the part of a semiconductor portion of the first semiconductor chip section  22  is removed, and both the semiconductor chip sections  22  and  26  are connected to each other through the connection wiring  67  in the semiconductor removal region  52 . In this embodiment, since the several configurations of the above-described embodiments are applicable to the other configuration excluding the layout of the wiring connection portion, a detailed description thereof is omitted. 
         [0201]    In the seventh embodiment, the pairs of first connection pads  65  and second connection pads  63  are arranged in the vertical direction (so-called longitudinal direction) in which the laying wirings  40   d  and  53   d  corresponding to the vertical signal lines extend. A plurality of connection pad pairs  99  is arranged in the horizontal direction in which the laying wirings  40   d  and  53   d  are arranged and a plurality of stages three stages of the connection pad pairs  99  are arranged in the vertical direction to configure a connection pad array  98 . 
         [0202]    The first connection pads  65  and the second connection pads  63  have an octagonal shape, and preferably, a regular octagonal shape in a plan view, like the description of the fourth embodiment. The first connection pads  65  and the second connection pads  63  are electrically connected to each other by the connection wirings  67  each including the connection conductor  68 , the through connection conductor  69 , and the link conductor  71 , like the above description. 
         [0203]    When the wirings  40  of the multi wiring layer  41  in the first semiconductor chip section  22  are configured byfour-layer metals, it is preferable that the first connection pads  65  are formed by the first-layer metal the laying wirings  40   d  connected to the first connection pads  65  are formed by the fourth-layer metal. However, the invention is not limited thereto. The first connection pads  65  and the laying wirings  40   d  may be formed by any layer metal. 
         [0204]    When the wirings  53  of the multi wiring layer  55  in the second semiconductor chip section  26  are configured by four-layer metals, it is preferable that the second connection pads  63  are formed by the fourth-layer metal and the laying wirings  53   d  connected to the second connection pads  63  are formed by the first-layer metal. However, the invention is not limited thereto. The second connection pads  63  and the laying wirings  53   d  may be formed by any layer metal. The laying wirings  40   d  and  53   d  are connected at the interval of three lines to the three-stage pad pairs  99  of the connection pad array  98 . 
         [0205]    In the solid-state imaging device  97  according to the seventh embodiment, the connection pad array  98  is configured by arranging the plurality of stages of the connection pad pairs  99  in which the first connection pads  65  and the second connection pads  63  are arranged in the vertical direction. Therefore, the wirings  40   d  and  53   d  can be drawn. In particular, even in the connection pads  65  and  63  having the area larger than that of the pixels, the wirings  40   d  and  53   d  can be drawn, thereby providing a high-performance solid-state imaging device. When the laying wirings  40   d  and  53   d  are disposed so as to cross the connection pads  65  and  63 , respectively, the distance between the adjacent laying wirings can be sufficiently increased, thereby reducing the adjacent coupling capacitance occurring between the laying wirings. 
         [0206]    In the seventh embodiment, even when the configuration of the connection wirings of the first, second, or third embodiment is used, the adjacent coupling capacitance can be similarly reduced. 
         [0207]    In the seventh embodiment, the same advantages as those of the first to third embodiments can be obtained. 
         [0208]    The planar shapes of the connection pads  65  and  63  are octagonal, but may be a polygonal shape such a tetragonal shape or a hexagonal shape (preferably, regular hexagonal shape), a circular shape, or the like. The cross-sectional surface shapes of the connection conductor  68  and the through connection conductor  69  can be configured to be the planar shapes of the connection pads  65  and  63 . The planar shapes of the connection pads  65  and  63  may be different from the cross-sectional surface shapes of the connection conductor  68  and the through connection conductor  69 . 
         [0209]    In the solid-state imaging devices according to the above-described embodiments, electrons serve as the signal charges, the first conductive type is the p-type, and the second conductive type is the n-type. However, the embodiments are also applicable to a solid-state imaging device in which holes serve as the signal charges. In this case, the conductive types of each semiconductor substrate and the semiconductor well region or the semiconductor region are configured conversely. The n-type is configured as the first conductive type and the p-type is configured as the second conductive type. An n-channel transistor and a p-channel transistor are applicable to the MOS transistors of the logic circuit. 
         [0210]      FIG. 40  is a diagram illustrating a semiconductor device according to an eighth embodiment of the invention. A semiconductor device  131  according to the eighth embodiment includes a stacked semiconductor chip  100  in which a first semiconductor chip section  101  having a first semiconductor integrated circuit and a multi wiring layer and a second semiconductor chip section  116  having a second semiconductor integrated circuit and a multi wiring layer are bonded to each other. The first semiconductor chip section  101  and the second semiconductor chip section  116  are bonded to each other so that multi wiring layers face each other. The first and second semiconductor chip sections can be bonded by an adhesive layer  129  with protective layers  114  and  127  interposed therebetween. Alternatively, the first and second semiconductor chip sections may be bonded by plasma joining. 
         [0211]    In this embodiment, the semiconductor removal region  52 , where a part of a semiconductor portion of the first semiconductor chip section  101  is entirely removed, is formed and the connection wirings  67  each connecting the first semiconductor chip section  101  to the second semiconductor chip section  116  are formed in the semiconductor removal region  52 . The semiconductor removal region  52  is all regions including the portion where the respective connection wirings  67  of the semiconductor integrated circuits are formed, and is formed in the peripheral section of the semiconductor chip section  101 . 
         [0212]    In the first semiconductor chip section  101 , the first semiconductor integrated circuit the logic circuit  102  is formed in a thinned first semiconductor substrate  103 . That is, a plurality of MOS transistors Tr 11 , Tr 12  and Tr 13  are formed in a semiconductor well region  104  formed in the semiconductor substrate (such as, but not limited to, a silicon substrate)  103 . The MOS transistors Tr 11  to Tr 13  each include a pair of source/drain regions  105  and gate electrodes  106  formed via an insulation film. The MOS transistors Tr 11  to Tr 13  are isolated from each other by device isolation regions  107 . 
         [0213]    The MOS transistors Tr 11  to Tr 13  are representative transistors. The logic circuit  102  may include CMOS transistors. Therefore, the plurality of MOS transistors may be configured as n-channel MOS transistors or p-channel MOS transistors. Therefore, when the n-channel MOS transistors are formed, source/drain regions are formed in the p-type semiconductor well region. When the p-channel MOS transistors are formed, p-type source/drain regions are formed in the n-type semiconductor well region. 
         [0214]    A multi wiring layer  111  in which wirings  109  formed by a plurality of metals triple layered metals are stacked via an inter-layer insulation film  108  is formed on the semiconductor substrate  103 . The wirings  109  can be formed by a material such as, but not limited to, Cu wirings. The MOS transistors Tr 11  to Tr 13  are connected with the necessary first-layer wiring  109  and a connection conductor  112  interposed therebetween. The three-layer wirings  109  are connected to each other through a connection conductor. 
         [0215]    In the second semiconductor chip section  116 , the second semiconductor integrated circuit the logic circuit  117  is formed in a second semiconductor substrate  118 . That is, a plurality of MOS transistors Tr 21 , Tr 22 , Tr 23  are formed in a semiconductor well region  119  formed in the semiconductor substrate (such as, but not limited to, a silicon substrate)  118 . The MOS transistors Tr 21  to Tr 23  each include a pair of source/drain regions  121  and gate electrodes  122  formed via an insulation film. The MOS transistors Tr 21  to Tr 23  are isolated from each other by device isolation regions  123 . 
         [0216]    The MOS transistors Tr 21  to Tr 23  are representative transistors. The logic circuit  117  may include CMOS transistors. Therefore, the plurality of MOS transistors may be configured as n-channel MOS transistors or p-channel MOS transistors. Therefore, when the n-channel MOS transistors are formed, source/drain regions are formed in the p-type semiconductor well region. When the p-channel MOS transistors are formed, p-type source/drain regions are formed in the n-type semiconductor well region. 
         [0217]    A multi wiring layer  126  in which wirings  125  formed by a plurality of metals triple layered metals are stacked via an inter-layer insulation film  124  is formed on the semiconductor substrate  118 . The wirings  125  can be formed by a material including, but not limited to, Cu wirings. The MOS transistors Tr 21  to Tr 23  are connected with the necessary first-layer wiring  125  and a connection conductor  120  interposed therebetween. The three-layer wirings  125  are connected to each other through a connection conductor  120 . The semiconductor substrate  118  of the second chip section  116  also serves as a support substrate of the thinned first semiconductor chip section  101 . 
         [0218]    As the first semiconductor integrated circuit a semiconductor memory circuit may be used instead of the logic circuit  102 . In this case, the logic circuit  117  serving as the second semiconductor integrated circuit is provided to process signals of the semiconductor memory circuit. 
         [0219]    In the semiconductor removal region  52 , the entire first semiconductor substrate  118  is removed by etching. The stacked insulation film  61  including a silicon oxide (SiO 2 ) film  58  and a silicon nitride (SiN) film  59  is formed to extend from the bottom surface and the side surface of the semiconductor removal region  52  to the front surface of the semiconductor substrate  118 . The stacked insulation film  61  protects the semiconductor substrate  118  exposed to the front surface of the semiconductor substrate  118  and the side surface of the semiconductor removal region  52 . 
         [0220]    In the semiconductor removal region  52 , the connection hole  64 , which reaches from the silicon nitride film  59  to the first connection pad  65  electrically connected to a necessary wiring in the multi wiring layer  111  the wiring  109   d  of the third-layer metal in the first semiconductor chip section  101 , is formed. In addition, the through connection hole  62 , which is penetrated through the first semiconductor chip section  101  and reaches the second connection pad  63  electrically connected to a necessary wiring in the multi wiring layer  126  a wiring  125   d  formed by the third-layer metal in the second semiconductor chip section  116 , is formed. 
         [0221]    The connection wiring  67  includes the connection conductor  68  buried in the connection holes  64  and  62  and electrically connected to the first connection pad  65 , the through connection conductor  69  connected to the second connection pad  63 , and the link conductor  71  electrically connecting both of the conductors  68  and  69  to each other in the upper end of the conductors  68  and  69 . The link conductor  71  of the connection wiring  67  exposed to the outside serves as an electrode pad connected to an external wiring by a bonding wire. 
         [0222]    The semiconductor device according to the eighth embodiment can be manufactured by the manufacturing method described in the first embodiment. In this case, the pixel array and the control circuit of the first semiconductor chip section in the first embodiment is replaced by the first semiconductor integrated circuit and the logic circuit in the second embodiment chip section is replaced by the second semiconductor integrated circuit. 
         [0223]    In the semiconductor device according to the eighth embodiment, the first semiconductor chip section  101  and the second semiconductor chip  116  are bonded to each other. Therefore, the optimum processing techniques can be used when the first and second semiconductor integrated circuits are formed. Accordingly, the performances of the first and second semiconductor integrated circuits can be sufficiently achieved, thereby providing a high-performance semiconductor device. 
         [0224]    In this embodiment, the part of the first semiconductor chip section  101 , that is, the semiconductor portion of the region where the connection conductor  68  and the through connection conductor  69  are formed is completely removed. Since the connection conductor  68  and the through connection conductor  69  are formed in the semiconductor removal region  52 , parasitic capacitance between the semiconductor substrate  104  and the connection conductor  68  and the through connection conductor  69  can be reduced, thereby realizing high performance in the semiconductor device. 
         [0225]    In the eighth embodiment, the first semiconductor substrate  104  and the second semiconductor substrate  118  in a partly finished state are bonded to each other before formation of a chip, and then the first semiconductor substrate  104  is thinned in the manufacturing process. That is, the second semiconductor substrate  118  is used as the support substrate when the first semiconductor substrate  104  is thinned. Accordingly, the number of members can be reduced and the manufacturing process can be simplified. In this embodiment, the first semiconductor substrate  104  is thinned and the through connection hole  62  and the connection hole  64  are formed in the semiconductor removal region  52  where the semiconductor portion is removed. Therefore, the aspect ratio of the holes is reduced, thereby forming the connection holes with high precision. Accordingly, the high-performance semiconductor device can be manufactured with high precision. 
         [0226]      FIG. 41  is a diagram illustrating a semiconductor device according to a ninth embodiment of the invention. A semiconductor device  132  according to the ninth embodiment includes a stacked semiconductor chip  100  in which the first semiconductor chip section  101  including the first semiconductor integrated circuit and a multi wiring layer and the second semiconductor chip section  116  including the second semiconductor integrated circuit and a multi wiring layer are bonded to each other. The first semiconductor chip section  101  and the second semiconductor chip section  116  are bonded to each other so that multi wiring layers face each other. 
         [0227]    In this embodiment, the semiconductor removal region  52 , where a part of a semiconductor portion of the first semiconductor chip section  101  is entirely removed, is formed and the stacked insulation film  61  extending from the internal surface of the semiconductor removal region  52  to the rear surface of the semiconductor substrate  103  is formed. The insulation film  77  subjected to planarization and thus flush with the front surface of the stacked insulation film  61  on the semiconductor substrate  103  is formed in the semiconductor removal region  52 . Like the above description, the insulation film  77  is formed by an insulation film, such as a silicon oxide film, with an etching rate different from that of the silicon nitride film  59  on the front surface of the stacked insulation film  61 . 
         [0228]    Then, the connection hole  64  and the through connection hole  62  reaching the first connection pad  65  and the second connection pad  63 , respectively, through the insulation film  77  are formed. The connection wiring  67  connecting the first connection pad  65  to the second connection pad  63  is formed through both the connection holes  64  and  62 . The connection wiring  67  includes the connection conductor  68  buried in the connection holes  64  and  62  and electrically connected to the first connection pad  65 , the through connection conductor  69  electrically connected to the second connection pad  63 , and the link conductor  71  electrically connecting both of the conductors  68  and  69  to each other in the upper end. The connection conductor  68 , the through connection conductor  69 , and the link conductor  71  are integrally and necessarily formed of metal. The link conductor  71  is formed on the insulation film  77  subjected to planarization. 
         [0229]    The other configuration is the same as the above-described configuration of the eighth embodiment. Therefore, the same reference numerals are given to the corresponding members in  FIG. 40  and the repetition of the description thereof is omitted. 
         [0230]    The semiconductor device  132  according to the ninth embodiment can be manufactured by the manufacturing method described in the second embodiment. In this case, the pixel array and the control circuit of the first semiconductor chip section in the second embodiment is replaced by the first semiconductor integrated circuit and the logic circuit in the second embodiment chip section is replaced by the second semiconductor integrated circuit. 
         [0231]    In the semiconductor device  132  according to the ninth embodiment, the part of the first semiconductor chip section  101 , that is, the semiconductor portion of the region where the connection conductor  68  and the through connection conductor  69  are formed is completely removed, the insulation film  77  is buried in the removed semiconductor removal region  52 . Since the connection conductor  68  and the through connection conductor  69  are buried in the connection hole  64  and the through connection hole  62  formed in the insulation film  77 , the connection conductors  68  and  69  are distant from the side surface of the semiconductor substrate  103  by the insulation film  77 . Therefore, the parasitic capacitance between the connection conductors  68  and  69  and the semiconductor substrate  103  can be reduced. Since the inside of the semiconductor removal region  52  is buried by the insulation film  77 , the surface of the semiconductor substrate  103  facing the side wall of the semiconductor removal region  52  can be reliably protected mechanically in cooperation with the stacked insulation film  61 . Accordingly, high performance in the semiconductor device can be realized. 
         [0232]    In this embodiment, the first semiconductor substrate  103  is thinned and the through connection hole  62  and the connection hole  64  are formed. Therefore, the aspect ratio of the holes is reduced, thereby forming the connection holes  62  and  64  with high precision. Accordingly, the high-performance semiconductor device can be manufactured with high precision. 
         [0233]    Further description is omitted, but the same advantages as those of the eighth embodiment can be obtained. 
         [0234]      FIG. 42  is a diagram illustrating a semiconductor device according to a tenth embodiment of the invention. A semiconductor device  133  according to the tenth embodiment includes the stacked semiconductor chip  100  in which the first semiconductor chip section  101  including a first semiconductor integrated circuit and a multi wiring layer and the second semiconductor chip section  116  including a second semiconductor integrated circuit and a multi wiring layer are bonded to each other. The first semiconductor chip section  101  and the second semiconductor chip section  116  are bonded to each other so that multi wiring layers face each other. 
         [0235]    In this embodiment, the semiconductor removal region  52 , where a part of a semiconductor portion of the first semiconductor chip section  101  is entirely removed, is formed and the stacked insulation film  61  extending from the internal surface of the semiconductor removal region  52  to the rear surface of the semiconductor substrate  103  is formed. The insulation film  77  subjected to planarization and thus flush with the front surface of the stacked insulation film  61  on the semiconductor substrate  103  is buried in the semiconductor removal region  52 . The concave portion  81  with a necessary depth from the front surface is formed in the portion corresponding to the connection wiring  67  of the insulation film  77 . 
         [0236]    Then, the connection hole  64  and the through connection hole  62  reaching the first connection pad  65  and the second connection pad  63 , respectively, through the insulation film  77  below the concave portion  81  are formed. The connection wiring  67  connecting the first connection pad  65  to the second connection pad  63  through both the connection holes  64  and  62  is formed. The connection wiring  67  includes the connection conductor  68  buried in the connection holes  64  and  62  and electrically connected to the first connection pad  65 , the through connection conductor  69  electrically connected to the second connection pad  63 , and the link conductor  71  electrically connecting both of the conductors  68  and  69  to each other in the upper end. The connection conductor  68 , the through connection conductor  69 , and the link conductor  71  are integrally and necessarily formed of metal. The link conductor  71  is buried in the concave portion  81  of the insulation film  77 . The front surface of the link conductor  71  is flush with the front surface of the insulation film  77  subjected to planarization. 
         [0237]    The other configuration is the same as the above-described configuration of the eighth embodiment. Therefore, the same reference numerals are given to the corresponding members in  FIG. 40  and repetition of the description thereof is omitted. 
         [0238]    The semiconductor device  133  according to the tenth embodiment can be manufactured by the manufacturing method described in the third embodiment. In this case, the pixel array and the control circuit of the first semiconductor chip section in the third embodiment is replaced by the first semiconductor integrated circuit and the logic circuit in the second embodiment chip section is replaced by the second semiconductor integrated circuit. 
         [0239]    In the semiconductor device  133  according to the tenth embodiment, the part of the first semiconductor chip section  101 , that is, the semiconductor portion of the region where the connection conductor  68  and the through connection conductor  69  are formed is completely removed, the insulation film  77  is buried in the removed semiconductor removal region  52 . The concave portion  81  is formed in the insulation film  77 , and the connection conductor  68  and the through connection conductor  69  are penetrated through the connection hole  64  and the through connection hole  62  formed in the insulation film  77  below the concave portion  81 , respectively, to form the connection wiring  67 . Accordingly, both the connection conductors  68  and  69  are distant from the side surface of the semiconductor substrate  103  by the insulation film  77 , thereby reducing the parasitic capacitance between the connection conductors  68  and  69  and the semiconductor substrate  103 . Since the inside of the semiconductor removal region  52  is buried by the insulation film  77 , the surface of the semiconductor substrate  103  facing the side wall of the semiconductor removal region  52  can be reliably protected mechanically in cooperation with the stacked insulation film  61 . Accordingly, high performance in the solid-state imaging device can be realized. 
         [0240]    Since the link conductor  71  is buried in the concave portion  81  of the insulation film  77  and the link conductor  71  is subjected to planarization so as to be flush with the front surface of the insulation film  77 , the semiconductor device with a small uneven surface can be obtained. 
         [0241]    In the tenth embodiment, the first semiconductor substrate  103  is thinned, the concave portion  81  is formed in the insulation film  77 , and the through connection hole  62  and the connection hole  64  are formed. Therefore, the aspect ratio of the holes is reduced, thereby forming the connection holes  62  and  64  with high precision. Accordingly, a high-performance semiconductor device can be manufactured with high precision. 
         [0242]    Further description is omitted, but the same advantages as those of the eighth embodiment can be obtained. 
         [0243]    In the above-described eighth to tenth embodiments, two semiconductor chip sections are bonded to each other. In the semiconductor device according to the embodiments of the invention, three or more semiconductor chip sections may be bonded to each other. Even in a configuration in which three or more semiconductor chip sections are bonded to each other, the above-described configurations in which the semiconductor portion is completely removed are applicable to the connection portion between the first semiconductor chip section including the first semiconductor integrated circuit and the second semiconductor chip section including the second semiconductor integrated circuit. A memory circuit and other electric circuits excluding a logic circuit are applicable to the semiconductor integrated circuit. 
         [0244]    In the above embodiments, the layouts of the connection pad arrays  91 ,  91 A,  91 B, and  98  described in the fourth to seventh embodiments are applied to the solid-state imaging device in which the semiconductor portion in the region of the connection wirings  67  according to the first to third embodiments is completely removed. The layouts of the connection pad arrays  91 ,  91 A,  91 B, and  98  are applicable to the semiconductor device according to the eighth to tenth embodiments. The layouts of the connection pad arrays  91 ,  91 A,  91 B, and  98  are not limited thereto. When another wafer or chip is bonded to form connection wirings, the layouts of the connection pad arrays are applicable to a case where a semiconductor in the vicinity of the connection wirings is not removed. The layouts of the connection pad arrays are applicable to a semiconductor device, such as a solid-stage imaging device or a semiconductor device having the above semiconductor integrated circuit, in which the connection conductor  68  and the through connection conductor  69  are penetrated through the semiconductor substrate and are buried via an insulation film without removing the semiconductor portion. 
         [0245]      FIGS. 43 and 44  are diagrams illustrating an example of the solid-state imaging device in which the connection wirings are formed without removing the semiconductor portion and to which the connection pad layout is applied. In this example, a solid-state imaging device  135  has a configuration in which the semiconductor in the region of the connection wirings  67  shown in  FIG. 16  in the above-described second embodiment is not removed. In this example, the connection hole  64  penetrated through the first semiconductor substrate  31  and reaching the first connection pad  65  and the through connection hole  62  penetrated through the first semiconductor chip section  22  including the semiconductor substrate  31  and reaching the second connection pad  63  are formed in the connection wiring region. The semiconductor substrate  31  and an insulation film  136  for insulation are formed on the inner surface of each of the connection hole  64  and the through connection hole  62 . The connection wiring is formed in which the connection conductor  68  and the through connection conductor  69  are buried in the connection hole  65  and the through connection hole  62  and are connected to each other by the link conductor  71  so as to be connected to the first connection pad  65  and the second connection pad  63 , respectively. Since the other configuration is the same as that described in the second embodiment, the same reference numerals are given to the corresponding members in  FIG. 16  and repetition of the description thereof is omitted. 
         [0246]    On the other hand, as shown in  FIG. 44 , the layout of the wiring connection portion including the connection pads  63  and  65  in the solid-state imaging device  135  of this example has the same structure as that in  FIG. 31 . That is, the connection pad array  91  is formed in which the connection pad pairs  89  of the octagonal connection pads  63  and  65  are densely arranged in four stages. Since the other detailed configuration is the same as that in  FIG. 31 , the same reference numerals are given to the corresponding members in  FIG. 31  and repetition of the description thereof is omitted. 
         [0247]    In the solid-state imaging device  135  of this example, the distance between the adjacent laying wirings  40   d  and the distance between the laying wirings  53   d  are increased, like the above description in  FIG. 31 . Accordingly, the adjacent coupling capacitance can be reduced. 
         [0248]      FIGS. 45 and 46  are diagrams illustrating an example of the semiconductor device in which the connection wirings are formed without removing the semiconductor portion and which includes the semiconductor integrated circuit to which the connection pad layout is applied. In this example, a semiconductor device  137  has a configuration in which the semiconductor in the region, where the connection wirings  67  is formed, shown in  FIG. 41  in the above-described ninth embodiment is not removed. In this example, the connection hole  64  penetrated through the first semiconductor substrate  31  and reaching the first connection pad  65  and the through connection hole  62  penetrated through the first semiconductor chip section  22  including the semiconductor substrate  31  and reaching the second connection pad  63  are formed in the connection wiring region. The semiconductor substrate  31  and the insulation film  136  for insulation are formed on the inner surface of each of the connection hole  64  and the through connection hole  62 . The connection wiring is formed in which the connection conductor  68  and the through connection conductor  69  are buried in the connection hole  65  and the through connection hole  62  and are connected to each other by the link conductor  71  so as to be connected to the first connection pad  65  and the second connection pad  63 , respectively. Since the other configuration is the same as that described in the sixth embodiment, the same reference numerals are given to the corresponding members in  FIG. 41  and repetition of the description thereof is omitted. 
         [0249]    On the other hand, as shown in  FIG. 44 , the layout of the wiring connection portion including the connection pads  63  and  65  in this example has the same structure as that in  FIG. 31 . That is, the connection pad array  91  is formed in which the connection pad pairs  89  of the octagonal connection pads  63  and  65  are densely arranged in four stages. Since the other detailed configuration is the same as that in  FIG. 31 , the same reference numerals are given to the corresponding members in  FIG. 31  and repetition of the description thereof is omitted. 
         [0250]    In the solid-state imaging device  137  of this example, the distance between the adjacent laying wirings  40   d  and the distance between the laying wirings  53   d  are increased, like the above description in  FIG. 31 . Accordingly, the adjacent coupling capacitance can be reduced. 
         [0251]    In the solid-state imaging device in which the connection wirings are formed without removing the semiconductor portion and the semiconductor device having an integrated circuit, the layout according to the fifth embodiment ( FIG. 36 ), the sixth embodiment ( FIGS. 37 and 38 ), the seventh embodiment ( FIG. 39 ), or the like is applicable as the layout of the connection pad. 
         [0252]    In the above-described solid-state imaging devices according to the embodiments, it is necessary to stabilize the potential of the semiconductor substrate or the semiconductor well region where the pixel array  23  of the first semiconductor chip section  22  is formed. That is, it is necessary to stabilize variation in the potentials of the through connection conductor  69  and the connection conductor  68  when operating without variation in the potential (so-called substrate potential) of the semiconductor substrate or the semiconductor well region in the vicinities of the through connection conductor  69  and the connection conductor  68 . In order to stabilize the substrate potential, in this example, a contact portion is formed in the semiconductor well region  32  by an impurity diffusion layer and the contact portion is connected to an electrode pad portion formed in the vicinity of a portion on the first semiconductor chip section  22  via the connection conductor  44  and the wiring  40 . By supplying a fixed voltage such as a power voltage VDD or a ground voltage (0 V) to the electrode pad portion, the power voltage or the ground voltage (0 V) is applied to the semiconductor well region  32  via the contact portion, thereby stabilizing the substrate potential of the semiconductor well region. For example, when the semiconductor substrate or the semiconductor well region is of the n-type, the power voltage is supplied. When the semiconductor substrate or the semiconductor well region is of the p-type, the ground voltage is applied. 
         [0253]    In the above-described solid-state imaging devices according to the embodiments, when the connection wirings  67  including the through connection conductor  69  and the connection conductor  68  are processed to be formed, protective diodes are installed in order to protect the transistors of the logic circuit against plasma damage. When the connection wirings  67  are formed, the connection holes  62  and  65  reaching the pads  63  and  65  are formed by plasma etching. However, particularly, the connection pads  63  in the logic circuit are charged with excessive plasma ions at the time of the plasma processing. When the transistors in the logic circuit are charged with the excessive plasma ions via the wirings  53 , the transistors receive so-called plasma damage. The protective diodes serve as preventing the plasma damage. 
         [0254]    In this embodiment, the protective diodes are formed in each logic circuit of each column circuit section of the column signal processing circuit  5 . As described above, the laying wirings corresponding to the respective vertical signal lines are connected to the through connection conductor  69  and the connection conductor  68  of each connection wiring  67  via the connection pads  63  and  65 , respectively. In the second semiconductor chip section  26 , the protective diodes are formed in each column circuit section in the semiconductor substrate  45  in which the MOS transistors of the column circuit section are formed. The protective diodes are connected to the same laying wirings to which the gate electrodes of the MOS transistors of the column circuit section are connected. The protective diodes connected to the laying wirings are disposed closer to the connection pads  63  than the MOS transistors of the column circuit section. At the time of plasma processing, the charges caused by the excessive plasma ions charged in the connection pads  63  of the logic circuit flow to the protective diodes and thus do not damage the column circuit section. Accordingly, the plasma damage to the column circuit section can be prevented when the connection wirings  67  are processed. Moreover, the same protective diodes can be installed in order to prevent the plasma damage to the MOS transistors of another peripheral circuit as well as preventing the plasma damage to the column circuit section. 
         [0255]    The solid-state image devices according to the above-described embodiments are applicable to a camera system such as a digital camera or a video camera or electronic apparatuses such as a portable phone with an image capturing function and other apparatuses with an imaging capturing function. 
         [0256]      FIG. 47  is a diagram illustrating a camera as an example of an electronic apparatus according to an eleventh embodiment of the invention. The camera according to this embodiment is a video camera capable of capturing a still image or a moving image. A camera  141  according to this embodiment includes a solid-state imaging device  142 , an optical system  143  guiding incident light to a light-sensing portion of the solid-state imaging device  142 , and a shutter device  144 . The camera  141  further includes a driving circuit  145  driving the solid-state imaging device  142  and a signal processing circuit  146  processing signals output from the solid-state imaging device  142 . 
         [0257]    The solid-state imaging device  142  is one of the solid-state imaging devices according to the above-described embodiments. The optical system (optical lens)  143  forms an image on the image capturing surface of the solid-state imaging device  142  with image light (incident light) from a subject. Then, signal charges are accumulated in the solid-state imaging device  142  for a given time. The optical system  143  may be an optical lens system configured by a plurality of optical lenses. The shutter device  144  controls a light illumination time and a light block time for the solid-state imaging device  142 . The driving circuit  145  supplies a driving signal to control the transmission operation of the solid-state imaging device  142  and the shutter operation of the shutter device  144 . Based on the driving signal (timing signal) supplied from the driving circuit  145 , the signal of the solid-state imaging device  142  is transmitted. The signal processing circuit  146  processes various kinds of signals. An image signal subjected to the signal processing is stored in a storage medium such a memory or output to a monitor. 
         [0258]    In the electronic apparatus such as a camera according to the eleventh embodiment, the high-performance solid-state imaging device  142  can be realized. Accordingly, the electronic apparatus with a high reliability can be provided. 
         [0259]    While various embodiments of the present invention have been described, it will be apparent to those of skill in the art that many more embodiments and implementations are possible that are within the scope of this invention. Accordingly, the present invention is not to be restricted except in light of the attached claims and their equivalents.

Technology Category: 5