Patent Document

CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a divisional of U.S. patent application Ser. No. 14/796,050 filed on Jul. 10, 2015, which claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2014-0107936 filed on Aug. 19, 2014 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. 
     
    
     BACKGROUND 
       [0002]    1. Field 
         [0003]    The following description relates to a photo sensor and to a photo sensor module configuring a UV sensor using poly silicon formed on a semiconductor substrate, which minimizes size of a chip by forming a passive device processing sensing signal in a vertical direction with a UV sensor. 
         [0004]    2. Description of Related Art 
         [0005]    UV sensing has recently been incorporated in various portable products, such as, for example, smart phone and wearable devices, because of an increase in awareness of protecting people from UV exposure. Such products, which are equipped with a UV sensor, can signal alarm before an end-user harms his or her health during outdoor exercise by measuring accumulated UV exposure concentration. Moreover, a UV sensor in smart phones or wearable devices can operate functions such as, for example, proximity and motion control, and measure UV exposure concentration, heart rate, pulse frequency and blood oxygen level. 
         [0006]    Silicon photo diode is generally used as a UV sensor. U.S. Pat. No. 8,071,946 (Multi-function light sensor, registered on Dec. 6, 2011, hereinafter referred to as ‘prior document’) to Kita (“Kita”) is an example of a UV sensor which uses silicon photo diode. Kita is incorporated herein in its entirety by reference in the same manner as when each cited document is separately and specifically incorporated or incorporated in its entirety. 
         [0007]    Kita discloses a UV sensor manufactured based on a Silicon on Insulator (SOI) substrate structure. The UV sensor provides a SOI substrate 12 comprising a silicon oxide insulator film 16 and a silicon semiconductor layer 18 configured of single crystal silicon on a silicon substrate 14. An ultraviolet ray sensing UV sensor is formed on the silicon semiconductor layer 18 configuring the SOI substrate 12. A first photo diode and a second photo diode which sense other rays, are formed on a silicon substrate 14 to avoid overlap with a UV sensor. A silicon oxide insulator film separates a first photo diode, a second photo diode, and a UV sensor. 
         [0008]    A UV sensor with the above-mentioned structure has some problem. A UV sensor is manufactured formed on a silicon semiconductor layer of a SOI substrate. Moreover, any active device or passive device to process sensing signal is not formed on a lower UV sensor. 
         [0009]    This makes it difficult to reduce the size of an IC chip comprising a UV sensor and making it difficult to reduce the size of the smart phones or wearable devices smaller. 
         [0010]    Demand for a UV sensor, which can detect UV with high sensitivity while reducing manufacturing cost is increasing. The UV sensors known in the art are not capable of high sensitivity sensing function and being cheaper than a SOI substrate. 
       SUMMARY 
       [0011]    This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
         [0012]    The present disclosure provides a UV sensor which is based on poly silicon formed on a semiconductor substrate. 
         [0013]    The present disclosure minimizes size of an IC chip size by improving a structure forming a passive device perpendicular to a UV sensor. 
         [0014]    The present disclosure provides one senor module to sense both UV and non-UV. 
         [0015]    In one general aspect there is provided a photo senor module including a semiconductor substrate, a field oxide layer, formed on the semiconductor substrate, and a photo sensor including a photo diode formed on the field oxide layer. 
         [0016]    The photo sensor module may include a first WELL region and a second WELL region formed on the semiconductor substrate, a first source/drain region formed on the first WELL region and a second source/drain region formed on the second WELL region, an isolation layer formed between the first WELL region and the second WELL region, and a gate insulator film and a gate electrode formed on the first WELL region and another gate insulator film and another gate electrode formed on the second WELL region. 
         [0017]    The photo sensor module may include an insulator film formed on the field oxide layer and the gate electrodes, and a passivation layer formed on the insulator film. 
         [0018]    A part of the insulator film and the passivation layer may be removed, and a part of the photo diode is exposed to outside. 
         [0019]    The photo diode may include two or more doping region formed in a module form to sense UV. 
         [0020]    The photo diode may include a first doping region of high concentration, a second doping region of low concentration, doped in a different impurity from the first doping region, and a third doping region of high concentration, doped in an identical impurity as the second doping region. 
         [0021]    The photo diode may include a first doping region of high concentration, a second doping region of low concentration doped in an identical impurity as the first doping region, and a third doping region of high concentration doped in different impurity from the second doping region. 
         [0022]    The third doping region may be enlarged to contact the first source/drain region. 
         [0023]    In another general aspect there is provided a photo sensor module, including a semiconductor substrate, a field oxide layer, formed on the semiconductor substrate, a passive device, placed on the field oxide layer, at least one insulator film laminated on the field oxide layer, and a photo diode formed on the at least one insulator film above the passive device. 
         [0024]    The photo sensor module may include a WELL region, formed on the semiconductor substrate, and a doping region of high concentration, formed on the WELL region. 
         [0025]    The photo sensor module may include a metal wire formed on the insulator film, and a trench connecting the metal wire to the WELL region. 
         [0026]    The trench may be filled with one of tungsten (W), aluminum (Al), or copper (Cu). 
         [0027]    A doping region of the photo diode and a source/drain doping region of the WELL region may be connected with a trench. 
         [0028]    The metal wire may surround a portion of the photo diode and a barrier metal may be formed below the metal wire. 
         [0029]    The barrier metal may include one of titanium(Ti), titanium nitride layer(TiN), or a combination of titanium(Ti) and titanium nitride layer(TiN). 
         [0030]    The photo sensor may include a first insulator film laminated on the field oxide layer, a second insulator film laminated on the first insulator film, a third insulator film laminated on the second insulator film, and a fourth insulator film laminated on the third insulator film, at least one first metal wire formed in the second insulator film, at least one first trench formed in the first insulator film, and the at least one first trench connecting the at least one first metal wire to a source/drain doping region of a WELL region of the semiconductor substrate, at least one second metal wire is formed on the fourth insulator film insulator, and the photo diode and at least one second trench is formed in the fourth insulator film, and the at least one second trench connecting the at least second first metal wire to the photo diode. 
         [0031]    The third insulator film may be thinner than the other insulator films. 
         [0032]    In another general aspect there is provided a photo sensor module, including a semiconductor substrate, a sensor section formed in the semiconductor substrate, at least one insulator film laminated on the semiconductor substrate, a photo diode placed on an upper portion of the sensor section and formed on the insulator film, and a UV shield formed between the sensor section and the photo diode. 
         [0033]    The sensor section may be configured to sense non-UV, and the photo diode is configured to sense UV. 
         [0034]    In another general aspect there is provided a photo sensor module, including a semiconductor substrate, a doping region of high concentration formed on the semiconductor substrate, a first field oxide layer and a second field oxide layer formed on the semiconductor substrate, a first photo diode and a second photo diode formed on the first field oxide layer and the second field oxide layer, respectively, and a portion of the first photo diode and a portion of the second photo diode contacting with the doping region of high concentration. 
         [0035]    The photo sensor module of claim  20 , wherein the first photo diode and the second photo diode are back-to-back diode. 
         [0036]    A doping region of the first photo diode and a doping region of the second photo diode may be enlarged to reach a source/drain doping region of a WELL region of the semiconductor substrate. 
         [0037]    The following description discloses a UV sensor that senses UV and a logic section that processes the UV sensor sensed signal simultaneously, on a semiconductor substrate. For example, when forming a poly silicon layer by deposing poly silicon on a field oxide layer or when forming a photo diode by doping impurity on the poly silicon layer, devices can be comprised under the identical process as the identical process is also applied together on a logic section. Therefore, the following description discloses a UV sensor that not only reduces the manufacture cost but also simplifies the manufacture process. 
         [0038]    The photo sensor module of the following description discloses a photo diode, which has a predetermined doping region on a semiconductor substrate. Hence, thickness of a semiconductor substrate maybe reducible compared to a manufacture, using a traditional SOI substrate. 
         [0039]    Additionally, the following description discloses a UV sensor that can not only place an active device or a passive device on a lower UV sensor but can also improved a structure by placing a sensor section that can sense non-UV. Thus, a UV sensor can reduce an equipped IC chip size. 
         [0040]    Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         [0041]      FIG. 1  is a diagram illustrating an example of a photo sensor module. 
           [0042]      FIG. 2  is a diagram illustrating another example of a photo sensor module. 
           [0043]      FIG. 3  is a diagram illustrating another example of a photo sensor module. 
           [0044]      FIG. 4  is a diagram illustrating another example of a photo sensor module. 
           [0045]      FIG. 5  is a diagram illustrating another example of a photo sensor module. 
           [0046]      FIG. 6  is a diagram illustrating another example of a photo sensor module. 
           [0047]      FIG. 7  is a diagram illustrating another example of a photo sensor module. 
           [0048]      FIG. 8  is a diagram illustrating another example of a photo sensor module according to the eighth embodiment of the present invention. 
           [0049]      FIG. 9  is a diagram illustrating another example of a photo sensor module. 
           [0050]      FIG. 10  is a diagram illustrating another example of a photo sensor module. 
           [0051]      FIG. 11  is a diagram illustrating another example of a photo sensor module. 
           [0052]      FIG. 12  is a diagram illustrating another example of a photo sensor module. 
           [0053]      FIG. 13  is a diagram illustrating another example of a photo sensor module. 
       
    
    
       [0054]    Throughout the drawings and the detailed description, unless otherwise described or provided, the same drawing reference numerals will be understood to refer to the same elements, features, and structures. The drawings may not be to scale, and the relative size, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience. 
       DETAILED DESCRIPTION 
       [0055]    The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. However, various changes, modifications, and equivalents of the systems, apparatuses and/or methods described herein will be apparent to one of ordinary skill in the art. The progression of processing steps and/or operations described is an example; however, the sequence of operations is not limited to that set forth herein and may be changed as is known in the art, with the exception of steps and/or operations necessarily occurring in a certain order. Also, descriptions of functions and constructions that are well known to one of ordinary skill in the art may be omitted for increased clarity and conciseness. 
         [0056]    The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided so that this disclosure will be thorough and complete, and will convey the full scope of the disclosure to one of ordinary skill in the art. 
         [0057]    The following description provides a photo sensor module, comprising a UV sensor which is a photo sensor, combatable with general silicon technology wherein, a ploy silicon layer, which is horizontally formed on a semiconductor substrate surface, a passive device formed on a lower UV sensor. Hence, the following description provides a photo sensor module at lower cost and having higher sensitivity sensing. 
         [0058]    Unless indicated otherwise, a statement that a first layer is “on” a second layer or a substrate is to be interpreted as covering both a case where the first layer directly contacts the second layer or the substrate, and a case where one or more other layers are disposed between the first layer and the second layer or the substrate. 
         [0059]    Words describing relative spatial relationships, such as “below”, “beneath”, “under”, “lower”, “bottom”, “above”, “over”, “upper”, “top”, “left”, and “right”, may be used to conveniently describe spatial relationships of one device or elements with other devices or elements. Such words are to be interpreted as encompassing a device oriented as illustrated in the drawings, and in other orientations in use or operation. For example, an example in which a device includes a second layer disposed above a first layer based on the orientation of the device illustrated in the drawings also encompasses the device when the device is flipped upside down in use or operation. 
         [0060]    Expressions such as “first conductivity type” and “second conductivity type” as used herein may refer to opposite conductivity types such as N and P conductivity types, and examples described herein using such expressions encompass complementary examples as well. For example, an example in which a first conductivity type is N and a second conductivity type is P encompasses an example in which the first conductivity type is P and the second conductivity type is N. 
         [0061]      FIG. 1  is a diagram illustrating an example of a photo sensor module. In  FIG. 1 , a semiconductor substrate  100  is a P type substrate doped with a P type impurity of low concentration. Other P type substrate, such as, for example, a P type substrate formed with a P-epi region, and the like may be used without departing from the spirit and scope of the illustrative examples described. 
         [0062]    For separation among devices of a semiconductor substrate ( 100 ), Local Oxidation of Silicon (LOCOS), Shallow Trench Isolation (STI) and Deep Trench Isolation (DTI) or an isolation layer of a combination of, STI and DTI may be used. An isolation layer can be differentiated with a first isolation layer to a third isolation layer  110 ,  112 ,  114  and a first isolation layer to a third isolation layer  110 ,  112 ,  114  are formed of a field oxide layer. A photo diode is formed on the first field oxide layer  110 , which is explained below. 
         [0063]    A first WELL region (PWELL)  120  and a second WELL region (NWELL)  130  are formed on a semiconductor substrate  100 . A first WELL region  120  is formed between a first isolation layer  110  and a second isolation layer  112 , and a second WELL region  130  is formed between a second isolation layer  112  and a third isolation layer  114 . A junction isolation well  140  can be formed on a side of a second WELL region  130  for separation among devices. When forming the WELL regions  120 ,  130 , and  140  a drive-in annealing method can be processed in a high temperature of approximately over 1000° C., for dopant diffusion. Source/drain regions  122  and  132  of high concentration are formed on a first WELL region  120  and a second WELL region  130 , respectively. Moreover, Lightly Doped Drain (LDD) regions  124  and  134  of low concentration are formed on source/drain regions  122  and  132  of high concentration, respectively. LDD regions  124  and  134  are formed by a blanket ion injection method. A blanket ion injection method is processed during or after a deposition of a gate electrode  154 . 
         [0064]    A gate insulator film  152  and a gate electrode  154  are formed on a first WELL region  120  and a second WELL region  130 . Thickness of a gate insulator film  152  formed on the first WELL region  120  and the second WELL region  130  can be identical or different. Spacers  156  are formed on both sides of a gate electrode  154 . 
         [0065]    A photo diode  160  is formed on a first isolation layer  110  as a UV sensor. Element  160  is referred to as a UV sensor or a photo diode in the following description. A UV sensor  160  is formed by deposing poly silicon on a field oxide layer, i.e., a first isolation layer  110  that is formed on a semiconductor substrate  100 . A poly silicon layer  160  senses UV when impurity is doped. In a non-exhaustive example, a UV sensor  160  includes, an N+ region  161  injected with N type impurity of high concentration, a P region (P−, P−− region)  162  injected with P type impurity of low concentration, and a P+ region  163  injected with P type impurity of high concentration. Moreover, an N+ region  161  is type N, a P region  162  and a P+ region  163  are type P, and a PN junction is formed between type N and type P. Thus, a depletion layer is formed on the P region  162  of low concentration impurity, between an N+ region and a P+ region. Electromotive force leading to a flow of electric current is generated by a light absorbed by the depletion layer. Accordingly, UV is sensed through the generation of electric current. Thickness of the N+ region  161 , the P region (P−, P−− region)  162  and the P+ region  163  can be identical or different. 
         [0066]    The UV sensor  160  in the example described above is formed in a form of a photo diode on a field oxide layer  110 , which is formed on a semiconductor substrate  100  and senses UV. The manufacture process can be simplified and thickness of the IC chip can be reduced as compared to applying UV sensor on a SOI substrate. 
         [0067]    In other examples described same reference numbers may be used in regards to identical structure but redundant explanation will be omitted. 
         [0068]      FIG. 2  is a diagram of another example of a photo sensor module. 
         [0069]    The photo sensor module shown in the example of  FIG. 2  has a structure that is similar to the photo sensor module shown in  FIG. 1 . The above description of  FIG. 1 , is also applicable to  FIG. 2 , and is incorporated herein by reference. Thus, the above description may not be repeated here. A doping region of a UV sensor formed on a field oxide layer in  FIG. 2  is different than the doping region of a UV sensor formed on a field oxide layer in  FIG. 1 .  FIG. 2  comprises an N+ region  164  injected of N type impurity of high concentration, an N region (N−, N−− region)  165  injected of N type impurity of low concentration, and a P+ region  166  injected of P type impurity of high concentration. Thus, a depletion layer is formed in an N region  165  of low impurity concentration, between N+ region and P+ region and an electromotive force is generated by light absorbed by the depletion layer. 
         [0070]    Like  FIGS. 1   2 , a UV sensor  160  photo diode can be applied in various ways, such as, for example, N+/P/P+ or N+/N/P+, although it is not limited to the doping region. A UV sensor can be formed with a photo diode of other doping regions, which are shown in the other examples. 
         [0071]      FIG. 3  is a diagram of another example of a photo sensor module. 
         [0072]    The photo sensor module shown in the example of  FIG. 3  has an structure that is similar to the photo sensor modules shown in  FIGS. 1 and 2 . The above description of  FIGS. 1-2 , is also applicable to  FIG. 3 , and is incorporated herein by reference. Thus, the above description may not be repeated here. In  FIG. 3 , a semiconductor substrate  100  is provided, a first isolation layer to a third isolation layer  110 ,  112 ,  114  are formed on a semiconductor substrate  100 . A first WELL region (PWELL) to a third WELL region (NWELL)  120 ,  130 ,  140  are formed on a semiconductor substrate  100 . A source/drain region  122  and  132  of high concentration are formed on a first WELL region  120  and a second WELL region  130 . A gate insulator film  152 , a gate electrode  154 , and spacers  156  are formed on both sides of a gate electrode  154 . 
         [0073]    In the example shown in  FIG. 3 , doping region of a photo diode which forms a UV sensor  170 , comprises a P+ region, a P/P−/P−− region, and a N+ region. Among a P+ region, a P/P−/P−− region, and an N+ region, the N+ doping region  171  adjoins a semiconductor substrate  100 . The N+ doping region  171  of a photo diode is extended and contacts with a source/drain region (N+)  122  of a first WELL region  120 . The N+ doping region  171  of a photo diode is formed together, generally in a deposition method, when other doping region P+ region and P/P−/P−− region are formed. Thickness of the doping regions can all be identical or different. Likewise, a photo diode formed in a deposition method is identically applied on other examples of the photo sensor module. 
         [0074]    Thus, electromotive power is generated between a P+ region and an N+ region, in a P region of low impurity concentration and in an extended region. 
         [0075]      FIG. 4  is a diagram of another example of a photo sensor module and  FIG. 5  is a diagram of yet another example of a photo sensor module. 
         [0076]    In  FIG. 4 , a first field oxide layer  210  and a second field oxide layer  220  are symmetrically formed on a semiconductor substrate  200 . A semiconductor substrate  200  is a P type substrate doped of P type impurity. 
         [0077]    An N+ region  250  doped of N type impurity of high concentration is formed adjacent to a central part where a first field oxide layer  210  and a second field oxide layer  220  adjoin. 
         [0078]    Photo diodes  230 ,  240  are symmetrically formed on the first field oxide layer  210  and on the second field oxide layer  220 , respectively. A photo diode  230  formed on a first field oxide layer  210  forms an N+ doping region  231  by contacting with an N+ region  250 , doped of high concentration. A P (P−, P−−) doping region and a P+ doping region are formed in order, adjacent to the N+ doping region  231 . Moreover, a photo diode formed on a second field oxide layer  210  forms an N+ doping region  241  by contacting with an N+ region  250 , doped of high concentration. A P (P−, P−−) doping region and a P+ doping region are formed in order, adjacent to a N+ doping region  241 . In other words, N+ doping regions  231 ,  241  are extended and contacts with an N+ region  250 . Photo diodes  230 ,  240  are all formed in a deposition method on a first field oxide layer  210  and the field oxide layer  220 , and thickness of photo diodes  230 ,  240  can be identical or different. 
         [0079]    In the example shown in  FIG. 4 , a doping region of photo diodes  230 ,  240 , which comprises a UV sensor is a structure that is in contact with a semiconductor substrate  200 . 
         [0080]    Meanwhile, an example of a doping region of a UV sensor, which is formed different but with an identical structure with  FIG. 4  is shown in  FIG. 5 .  FIG. 5  shows that a first field oxide layer  210  and a second field oxide layer  220  are formed identically on a P type semiconductor substrate  200 . Photo diodes  230 ,  240 , which is a UV sensor, are formed and on a first field oxide layer  210  and a second field oxide layer  220 . 
         [0081]    Photo diodes  230 ,  240  of  FIG. 5  comprise a different doping region from a doping region of  FIG. 4 . A P+ doping region, an N− doping region and an N+ doping region are formed in order on a first field oxide layer  210  and a second field oxide layer  220  according to a P+ region  250  doped of high concentration on a P type semiconductor substrate  200 . P+ doping regions  231 ,  241  is extended to contact with the P+ region  250  doped of high concentration. A P+ region  250  is a region, doped of high concentration compared to a P type semiconductor substrate  200 . 
         [0082]      FIG. 6  is a cross sectional diagram of another example of a photo sensor module. 
         [0083]    The photo sensor module of  FIG. 6  is a structure of two photo diodes  330 ,  340  formed symmetrically. In  FIG. 6 , photo diodes  330 ,  340  have a P+/N−/P+ doping region using a Back-to-Back diode. 
         [0084]    A P type semiconductor substrate  300  is provided. A first field oxide layer  310  and a second field oxide layer  320  are symmetrically formed on a semiconductor substrate  300 . In a central part adjacent a first field oxide layer  310  and a second field oxide layer  320 , a P+ region  350  doped of P type impurity of high concentration is formed. 
         [0085]    Doping region of photo diodes  330 ,  340 , which is an UV sensor with P+/N−/P+ doping region is formed on the first field oxide layer  310  and the second field oxide layer  320 , respectively. A side of photo diodes  330  and  340  facing each other is extended and forms P+ doing regions  331  and  341  respectively. The P+ doing regions  331  and  341  contacts with a P+ region  350 . The doping regions  331  and  341  of photo diodes  330  and  340  comprise a UV sensor and contacts with a semiconductor substrate  300 . 
         [0086]    In another example, a photo diode of an N+/P/N+ doping region, different from the P+/N−/P+ doping region can be provided. In this example, an N+ doping region is formed on a P type semiconductor substrate. The extended section of photo diode contacts with an N+ doping region of a semiconductor substrate. 
         [0087]      FIG. 7  is a diagram illustrating another example of a photo sensor module. 
         [0088]    Referring to a photo sensor module of  FIG. 7 , semiconductor substrate  400  doped in a first P type impurity is formed. 
         [0089]    On a semiconductor substrate  400  surface, isolation layers  410 ,  412 , and  414  of a combination of LOCOS, STI and DTI are formed for separation of devices. In a non-exhaustive example, a first isolation layer to third isolation layer  410 ,  412 , and  414  are field oxide layer. 
         [0090]    A first WELL region PWELL  420  and a second WELL region NWELL  430  are formed between the first isolation layer to the third isolation layers  410 ,  412 , and  414 . A first WELL region  420  is formed between a first isolation layer  410  and a second isolation layer  412 , and a second WELL region  430  is formed between a second isolation layer  412  and a third isolation layer  414 . On a side of a second WELL region  430 , a junction isolation well  440  can be formed for separation of devices. When forming the WELL regions  420 ,  430 , and  440  a drive-in annealing can be processed in a high temperature of approximately over 1000° C. for dopant diffusion. On the first WELL region  420  and the second WELL region  430 , source/drain regions  421  and  431  of high concentration are formed. On lower spacers  505 , LDD regions  422  and  432 , which are doping region of low concentration, are formed. LDD regions  422  and  432  can be formed in a blanket ion injection method. 
         [0091]    A first insulator film to a fourth insulator film  500 ,  510 ,  520 , and  530  are formed in order on a semiconductor substrate  400 . 
         [0092]    A first layer insulator film  500  is formed on a semiconductor substrate  400 . A resistor  502 , a gate insulator film  503 , and a gate electrode  504  are formed in a first layer insulator film  500 . A gate insulator film  503  and a gate electrode  504  are formed on a first WELL region  420  and a second WELL region  430 . Spacers  505  are formed on both sides of a gate electrode  504 . Multiple trenches  506  are formed on a first layer insulator film  500 . A trench  506  connects the source/drain region  421  with a metal wire  511 , which is formed on a second layer insulator film  510 . A conductor is filled in a trench  506 . Conductors, such as, for example, Tungsten (W), Aluminum (Al), and Copper (Cu) so on are used as a filling material. A trench  506  formed on the first layer insulator film  500  is called a ‘first trench.’ 
         [0093]    A second layer insulator film  510  is formed on a first layer insulator film  500 . A metal wire  511  is formed on a second layer insulator film  510 . A part of a metal wire  511  is connected with a first trench  506 . 
         [0094]    A third layer insulator film  520  is formed on a second layer insulator film  520 . Thickness of a third layer insulator film  520  is comparatively thinner than other layer insulator films  500 ,  510 , and  530 . This is because no structure is formed on a third layer insulator film  520  but it only serves an insulation function. 
         [0095]    A fourth layer insulator film  530  is formed on a third layer insulator film  520 . A photo diode  531 , which is a UV sensor, is formed on a fourth layer insulator film  530 . A photo diode  531  has a P+ region, a P (or P−, P−−) region, and a N+ doping region. A P+ region and a N+ region, herein, should be connected with a source/drain region  421 ,  431 . For this, a metal wire  550  is formed on a fourth layer insulator film  550 . A trench  532   a , which connects a photo diode  531  and a metal wire  550  is formed on a fourth layer insulator film  530 . A trench  532   b  that connects a metal wire  550  and a metal wire  511  of a second layer insulator film  510  is also formed. Trench  532   b  connects the metal wire  550  to the metal wire  511  via a third layer insulator film  520  and a fourth layer insulator film  530 . Trenches  532   a  and  532   b  formed on a fourth layer insulator film  530  is called a ‘second trench.’ Trenches  532   a  and  532   b , unlike a form of a first trench, can be formed in a via form according to thickness of a layer insulator film. 
         [0096]    In this example shown in  FIG. 7 , a photo diode  531  is absorbed in a P region of low concentration that is formed between a P+ region and an N+ region when the light is irradiated from above. Electromotive power is generated by absorbed light, and the photo diode  531  senses UV, using change of electromotive power. In this example, a photo diode  531 , which is a UV sensor is formed on a fourth layer insulator film  530 , separated from a semiconductor substrate  400 . A register  502 , which is a passive device, is formed on a first isolation layer  410 , thus, a passive device and a UV sensor are placed vertically. 
         [0097]      FIG. 8  is a cross sectional diagram of another example of a photo sensor module. The example of  FIG. 8  is different from the example shown in  FIG. 7  because a second layer insulator film and a third layer insulator film are not formed in the example shown in  FIG. 8 . 
         [0098]    A photo diode  531 , which is a UV sensor, is a structure of source/drain regions  421 ,  431 , metal wires  533 ,  550 , and trenches  506 ,  532  that are connected with each other. An N+ doping region of a photo diode  531  is directly connected with a source/drain region  421  of a first WELL region  420  via a trench  506 . 
         [0099]    In the case of the eighth embodiment, a UV sensor is placed on an upper passive device. 
         [0100]      FIG. 9  is a cross sectional diagram of another example of a photo sensor module. 
         [0101]    Referring to the photo sensor module of  FIG. 9 , a first layer insulator film  500  and a second layer insulator film  530  are included on a semiconductor substrate  400 . 
         [0102]    A first WELL region  420  and a second WELL region  430  are formed on a semiconductor substrate  400 . A source/drain region  505  is formed on a first WELL region  420  and a second WELL region  430 . Moreover, with reference to  FIG. 7 , a second isolation layer  412  is formed on a semiconductor substrate  400 , between a first isolation layer  410 , the first WELL region  420 , and a second WELL region  430 . 
         [0103]    On a first layer insulator film  500 , a register  502 , a gate electrode  504 , and a gate insulator film  503  are formed. A plurality of a first trench  506  are formed. This is identical to the other recited examples, the description of which are incorporated herein by reference. Thus, the above description may not be repeated here. 
         [0104]    A photo diode  531 , which is a UV sensor, is formed on a second layer insulator film  530 . A photo diode  531  comprises N+/P (P−, P−−) N+ doping region. In a second layer insulator film  530 , metal wires  533   a ,  533   b ,  533   c  are provided, and a part of metal wires  533   b ,  533   c  are placed on an N+ region of a photo diode  531 . A metal wire  533   c  is formed in a stair shape and surrounds an N+ doping region. On lower side of a metal wire  533   c , a barrier metal  534  is formed of titanium (Ti), titanium nitride layer (TiN) or a combination (TiN) of titanium (Ti) and titanium nitride layer (TiN). 
         [0105]    An N+ doping region of a UV sensor is directly connected with a source/drain region  505  of a first WELL region  420 . 
         [0106]    Since a second trench  532  is also formed on a second layer insulator film  530 , a second layer insulator film  530  is connected with a metal wire  550 , formed on upper portion of the second layer insulator film  530 , or with a first trench  506 . 
         [0107]      FIG. 10  is a cross sectional diagram of another example of a photo sensor module. 
         [0108]    The photo sensor module of  FIG. 10  provides a semiconductor substrate  600 . WELL regions  602 ,  604 , and  606  and isolation layers  610 ,  612 , and  614  are formed on the semiconductor substrate  600 . A photo diode  630 , a UV sensor, which has a N+/P/P+ doping region is formed on a first insolation layer  610 . 
         [0109]    On a upper semiconductor substrate  600 , a layer insulator film  620  is formed. A layer insulator film  620  can be thicker than thickness of a semiconductor substrate  600 . A part of a layer insulator film  620  has a region  625  that is removed. A part of a P doping region of a photo diode  530  is exposed by the removed region  625 . 
         [0110]    A passivation layer  640  is formed on a layer insulator film  620 . 
         [0111]      FIG. 11  is a cross sectional diagram of another example of a photo sensor module. Compared to the example of  FIG. 10 , a part of a layer insulator film  620  is not removed in  FIG. 11 . 
         [0112]    Isolation layers  610 ,  612 ,  614  are formed on a semiconductor substrate  600  wherein WELL regions  602 ,  604 ,  606  are formed. A photo diode  630  is formed on an isolation layer  610  of a semiconductor substrate  600 . A gate electrode  632  and a gate insulator film  633  are formed on a semiconductor substrate  600 . A layer insulator film  620  is formed on the semiconductor substrate  600 , including a photo diode  630 , a gate electrode  632  and a gate insulator film  633 . A passivation layer  640  is laminated on a layer insulator film  620 . A passivation layer  640  maximizes UV transmissivity. 
         [0113]      FIG. 12  is a cross sectional diagram of another example of a photo sensor module. 
         [0114]      FIG. 12  also has a similar structure in some parts compared to the other examples, for example,  FIG. 12  has similar structure as that of  FIG. 7 . The above description of the similar structures of  FIG. 7  is incorporated herein by reference in  FIG. 12 . Thus, the above description may not be repeated here. 
         [0115]    Referring to  FIG. 12 , a first layer insulator film to a fourth layer insulator film  710 ,  720 ,  730 ,  740  are laminated in order on a semiconductor substrate  700 . 
         [0116]    On a semiconductor substrate  700 , a first insulator film to a third insulator film  701 ,  702 ,  703  are formed and WELL regions  704 ,  705 ,  706  are formed according to the insulator films  701 ,  702 ,  703 . A register  711 , a gate electrode  712 , and a first trench  713  are formed on a first layer insulator film  710 . Metal wires  721  are formed on a second layer insulator film  720 . A photo diode  732  and second trenches  731  are formed on a third layer insulator film  730 . Metal wires  741  connected with second trenches  731  are formed on a fourth layer insulator film  740 . A passivation layer  750  is formed on a fourth layer insulator film  740 . 
         [0117]      FIG. 12  provides a structure that exposes a sensing region of a photo diode  732  to the outside. This is because a part of region  760  of a third layer insulator film  730 , a fourth layer insulator film  740 , and a passivation layer  740  is removed by an etching process. A photo sensor module can also be manufactured in this structure. 
         [0118]    With reference to  FIG. 13 , a photo sensor module can provide sensing function, which simultaneously senses UV and non-UV. 
         [0119]      FIG. 13  is a drawing of another example of a photo sensor module. A semiconductor substrate  800  is shown in  FIG. 13 . 
         [0120]    To separate the devices, isolation layers of LOCS, STI DTI or a combination of LOCS, STI and DTI are formed on a semiconductor substrate  800 . An isolation layer can be differentiated with a first isolation layer to a fourth isolation layer  801 ,  802 ,  803 ,  804 . A sensor section  810 , sensing non-UV, is formed between a first isolation layer  801  and a second isolation layer  802 ; a first WELL region (PWELL)  812  is formed between a second isolation layer  802  and a third isolation layer  803 ; a second WELL region (NWELL)  814  is formed between a third isolation layer  803  and a fourth isolation layer  804 . A source/drain region  812   a  of high concentration and a LDD region  812   b  of low concentration doping region, are formed on a first WELL region  812  and a second WELL region  814 . Further, a junction isolation well  816  is formed on a side of a second WELL region  814 . 
         [0121]    A first layer insulator layer (IMD: Inter metal dielectric)  820  is formed on a semiconductor substrate  800 . A gate insulator film  821  and a gate electrode  822  are formed on a first layer insulator film  820  in a corresponding region of a first WELL region  812  and a second WELL region  814 . Spacers  823  are formed on each side of a gate electrode  822 . First trenches  824  are formed corresponding with a source/drain region  812   a  on a first layer insulator film  820 . Conductor such as, for example, tungsten (W), aluminum (Al), and copper (Cu) is filled in a first trench  824 . 
         [0122]    A second layer insulator film (ILD: Inter layer dielectric)  830  is formed on a first layer insulator film  820 . Metal wire  831  is formed corresponding with a first trench  824  on a second layer insulator film  830 . 
         [0123]    A third layer insulator film (ILD: Inter layer dielectric)  840  is formed on a second layer insulator film  830 . A photo diode  850  and a UV sensor is formed on a third layer insulator film  840 . A photo diode  850  comprises P+/P/N+ doping region and is placed on a section corresponding to the upper sensor section  810  formed on the semiconductor substrate  800 . Second trenches  841  are also formed on a third layer insulator film  840 . 
         [0124]    A UV Block layer  860  is formed between a second layer insulator film  830  and a third layer insulator film  840 . A UV Block layer  860  blocks UV and only transmits non-UV. A sensor section  810 , which is formed on a semiconductor substrate  800 , senses non-UV. 
         [0125]    A fourth layer insulator film  870  is formed on a third layer insulator film  840  and a metal wire  871  is formed on the fourth layer insulator film  870 . A metal wire  871  is connected with a photo diode  850  using second trenches  841  or is connected with a metal wire  831  of a second layer insulator film  830 . 
         [0126]    A passivation layer  880  is formed on a fourth layer insulator film  870 . In the example shown in  FIG. 13 , a photo diode  850  senses UV and a sensor section  810  formed on lower photo diode  850  senses non-UV. 
         [0127]    The examples disclosed in the description above use poly silicon layer grown on a semiconductor substrate as a UV sensor and provides a photo sensor module of improved structure of other sensor section or a passive device that can sense non-UV, placed on a lower section of a UV sensor. 
         [0128]    While this disclosure includes specific examples, it will be apparent to one of ordinary skill in the art that various changes in form and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed in a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.

Technology Category: h