Patent Publication Number: US-2023154951-A1

Title: Solid-state imaging device and imaging apparatus

Description:
RELATED APPLICATION DATA 
     This application is a continuation of U.S. Pat. Application No. 14/348992 filed Mar. 1, 2014, which is the Section 371 National Stage of PCT/JP2012/075041 filed Sep. 28, 2012, the entireties of which are incorporated herein by reference to the extent permitted by law. The present application claims the benefit of priority to Japanese Patent Application No. JP 2011-223856 filed on Oct. 11, 2011, in the Japan Patent Office, the entirety of which is incorporated by reference herein to the extent permitted by law. 
    
    
     TECHNICAL FIELD 
     The present technique relates to a solid-state imaging device suitable for a longitudinal spectroscopic image sensor and an imaging apparatus including the solid-state imaging device. 
     BACKGROUND ART 
     In an image sensor according to the related art, color filters are generally formed in a Bayer array. 
     However, in the Bayer array, because light absorbed by each color filter cannot be used for photoelectric conversion, use efficiency of the light may be degraded by an amount corresponding to the color filters. 
     Therefore, for the purpose of raising use efficiency of light more than the color filters of the Bayer array to achieve high sensitivity or high resolution, a longitudinal spectroscopic image sensor in which a plurality of photodiodes are stacked in the same pixel has been suggested (for example, refer to Patent Documents 1 to 3). 
     In the longitudinal spectroscopic image sensor using a silicon substrate, the photodiodes are stacked at different depths in silicon to perform a color separation using that an absorption wavelength of light is different depending on a depth of the silicon substrate. 
     In addition, the charge is transferred to a surface of the silicon substrate through a charge transfer path (hereinafter, referred to as an “implantation plug”) formed by impurity implantation and having a charge gradient to read the charge from the photodiode formed in a deep portion of the silicon substrate. 
     Meanwhile, the charge that is accumulated in the photodiode near the surface of the silicon substrate is read to a floating diffusion using a transfer gate. 
     In the longitudinal spectroscopic image sensor having the above-described structure, when light leaks into the implantation plug or a field accumulation region near the surface, photoelectric conversion is generated by the leaked light. 
     However, because a wavelength component of the leaked light is different from a wavelength component of light on which photoelectric conversion is executed by a photodiode connected to the implantation plug, the charge by the light of the different wavelength components is mixed and color mixture is generated. 
     Therefore, a light shielding film needs to be formed on the implantation plug to perform superior color separation by preventing the color mixture from being generated. 
     Meanwhile, if the light shielding film is formed on the implantation plug, an aperture ratio on the photodiode decreases by an amount corresponding to the implantation plug and sensitivity decreases, as compared with a configuration of a photodiode of a single layer in which the implantation plug is not formed. 
     That is, in the structure of the longitudinal spectroscopic image sensor according to the related art, the merit of the superior use efficiency of the light cannot be utilized. In addition, because the aperture ratio decreases and the sensitivity decrease, the merit of the longitudinal spectrum cannot be utilized. 
     CITATION LIST 
     Patent Document 
     
         
         Patent Document 1: JP 2005-12007 A 
         Patent Document 2: JP 2005-151077 A 
         Patent Document 3: JP 2006-278446 A 
       
    
     SUMMARY OF THE INVENTION 
     Problems to Be Solved by the Invention 
     In order to utilize the merits of the longitudinal spectroscopic image sensor, it is desirable to realize a structure in which the color mixture can be prevented from being generated, without decreasing the aperture ratio on the photodiode. 
     An object of the present technique is to provide a solid-state imaging device having superior color separation and high sensitivity and an imaging apparatus including the solid-state imaging device. 
     Solutions to Problems 
     A solid-state imaging device of the present technique includes: a semiconductor layer in which a surface side becomes a circuit formation surface; photoelectric conversion units of two layers or more that are stacked and formed in the semiconductor layer; and a longitudinal transistor in which a gate electrode is formed to be embedded in the semiconductor layer from a surface of the semiconductor layer. 
     The photoelectric conversion unit of one layer in the photoelectric conversion units of the two layers or more is formed over a portion of the gate electrode of the longitudinal transistor embedded in the semiconductor layer and is connected to the channel formed by the longitudinal transistor. 
     An imaging apparatus according to the present technique includes an optical system, the solid-state imaging device according to the present technique, and a signal processing circuit that processes an output signal of the solid-state imaging device. 
      According to a configuration of the solid-state imaging device according to the present technique described above, the photoelectric conversion unit of one layer in the photoelectric conversion units of the two layers or more is formed over a portion of the gate electrode of the longitudinal transistor embedded in the semiconductor layer and is connected to the channel formed by the longitudinal transistor. 
     Thereby, if the longitudinal transistor is turned on, the signal charge on which photoelectric conversion has been executed by the photoelectric conversion unit connected to the channel of the longitudinal transistor can be read to the surface side of the semiconductor layer to be the circuit formation surface. 
     In addition, during a charge accumulation period during which the longitudinal transistor is turned off, because the channel is not formed around the photoelectric conversion unit and the longitudinal transistor, the charge by light having the different wavelengths is not mixed and the color mixture is not generated. For this reason, even though a portion of the gate electrode is not covered with a light shielding film, the color mixture can be prevented from being generated. Thereby, as compared with a structure in which a portion of an implantation plug is covered with the light shielding film, an aperture ratio can be increased by widening an opening of the light shielding film. 
     In addition, because the photoelectric conversion unit is formed over the portion of the gate electrode embedded in the semiconductor layer, sensitivity can be improved by increasing an area of the photoelectric conversion unit, as compared with a structure in which the implantation plug is formed. 
     According to the configuration of the imaging apparatus according to the present technique described above, the imaging apparatus includes the solid-state imaging device according to the present technique. Therefore, in the solid-state imaging device, even though the portion of the gate electrode is not covered with the light shielding film, the color mixture can be prevented from being generated. In addition, the sensitivity can be improved by increasing the area of the photoelectric conversion unit. 
     Effects of the Invention 
     According to the present technique described above, because the color mixture is not generated, color separation is superior and an image having a superior image quality is obtained. 
     In addition, according to the present technique, because sensitivity can be improved by increasing an area of a photoelectric conversion unit, the high sensitivity is obtained. 
     Therefore, a solid-state imaging device having a superior image quality and high sensitivity and an imaging apparatus can be realized. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a schematic structural view (plan view) of a solid-state imaging device according to a first embodiment. 
         FIG.  2    is a cross-sectional view of a main portion of the solid-state imaging device according to the first embodiment. 
         FIG.  3    is a cross-sectional view of a main portion of a solid-state imaging device according to a second embodiment. 
         FIG.  4    is a cross-sectional view of a main portion of a solid-state imaging device according to a third embodiment. 
         FIG.  5    is a cross-sectional view of a main portion of a solid-state imaging device according to a fourth embodiment. 
         FIG.  6    is a cross-sectional view of a main portion of a solid-state imaging device according to a fifth embodiment. 
         FIG.  7    is a cross-sectional view of a main portion of a solid-state imaging device according to a sixth embodiment. 
         FIG.  8    is a diagram illustrating a planar array of color filters according to the sixth embodiment. 
         FIG.  9    is a schematic structural view (block diagram) of an imaging apparatus according to a seventh embodiment. 
         FIGS.  10 A and  10 B  are cross-sectional views of a structure according to the related art in which a plurality of photoelectric conversion units are stacked in a semiconductor substrate. 
         FIG.  11    is a diagram illustrating the case in which light is obliquely incident in a configuration of  FIG.  10 A . 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, best modes (hereinafter, referred to as embodiments) to carry out the present technique will be described. 
     The description will be made in the following order.
     1. First embodiment (solid-state imaging device)   2. Second embodiment (solid-state imaging device)   3. Third embodiment (solid-state imaging device)   4. Fourth embodiment (solid-state imaging device)   5. Fifth embodiment (solid-state imaging device)   6. Sixth embodiment (solid-state imaging device)   7. Modification of solid-state imaging device   8. Seventh embodiment (Imaging apparatus)   

     1. First Embodiment (Solid-State Imaging Device) 
     A schematic structural view (plan view) of a solid-state imaging device according to a first embodiment is illustrated in  FIG.  1   . 
     In addition, a cross-sectional view of a main portion of the solid-state imaging device according to the first embodiment is illustrated in  FIG.  2   . 
     This embodiment is obtained by applying the present technique to a CMOS type solid-state imaging device (CMOS image sensor). 
     A solid-state imaging device  1  according to this embodiment includes a solid-state imaging element obtained by forming a pixel unit (so-called imaging region)  3  in which a plurality of pixels  2  each including a photoelectric conversion unit are arranged regularly and two-dimensionally and a peripheral circuit unit including a driving circuit and the like in a semiconductor substrate  11 , for example, a silicon substrate, as illustrated in  FIG.  1   . 
     The pixel  2  has a photoelectric conversion unit and a pixel transistor composed of a MOS transistor. 
     As the pixel transistor, the pixel has at least one of, for example, a transfer transistor, a reset transistor, an amplification transistor, and a selection transistor. 
     The peripheral circuit unit has a vertical driving circuit  4 , a column signal processing circuit  5 , a horizontal driving circuit  6 , an output circuit  7 , a control circuit  8 , and the like. 
     The vertical driving circuit  4  is configured by, for example, a shift register and selects a pixel driving wiring line, supplies pulses to drive the pixels to the selected pixel driving wiring line, and drives the pixels in a row unit. That is, the vertical driving circuit  4  selectively scans the pixels  2  of the pixel unit  3  sequentially in the row unit in a vertical direction and supplies a pixel signal based on a signal charge generated according to a light reception amount in the photoelectric conversion element (for example, a photodiode) of each pixel  2  through a vertical signal line  9  to the column signal processing circuit  5 . 
     The column signal processing circuit  5  is arranged for each column of the pixels  2  and executes a signal process such as noise removal on signals output from the pixels of one row, for each pixel column. That is, the column processing circuit  5  executes a signal process such as CDS to remove fixed pattern noise peculiar to the pixels  2 , signal amplification, and AD conversion. A horizontal selection switch (not illustrated in the drawings) is connected between an output step of the column signal processing circuit  5  and a horizontal signal line  10 . 
     The output circuit  7  executes a signal process on a signal supplied sequentially from each column signal processing circuit  5  through the horizontal signal line  10  and outputs the signal. 
     An input/output terminal  12  exchanges a signal with the outside. 
       FIG.  2    illustrates a cross-sectional view of one pixel  2  of the solid-state imaging device  1  of  FIG.  1   . 
     The solid-state imaging device according to this embodiment has a so-called back surface radiation type structure in which light is made to be incident from the side opposite to a circuit or a wiring line to the semiconductor substrate in which a light receiving unit is formed. 
     In this embodiment, as illustrated in  FIG.  2   , two photoelectric conversion units PD 1  and PD 2  stacked in a depth direction of the semiconductor substrate  11  are formed in one pixel. 
     Each of the photoelectric conversion units PD 1  and PD 2  is composed of a photodiode formed in the semiconductor substrate  11 . 
     In addition, a light reception surface on which light is incident is formed at the side of a back surface  16  of the semiconductor substrate  11 . 
     Meanwhile, although not illustrated in the drawings, a circuit including a so-called read circuit and the like is formed at the side of a surface  15  of the semiconductor substrate  11 . 
      The first photoelectric conversion unit PD 1  of the side of the back surface  16  of the semiconductor substrate  11  in the two photoelectric conversion units PD 1  and PD 2  executes photoelectric conversion on blue B light having a short wavelength. The second photoelectric conversion unit PD 2  of the side of the surface  15  executes photoelectric conversion on read R light having a long wavelength. Thereby, a longitudinal spectroscopic image sensor is configured. 
     In the second photoelectric conversion unit PD 2  of the side of the surface  15  of the semiconductor substrate  11 , a floating diffusion (FD)  24  is provided at the left side through a transfer gate  23 . 
     In this embodiment, particularly, a longitudinal transistor T r   1  is connected to the first photoelectric conversion unit PD 1  of the side of the back surface  16  of the semiconductor substrate  11 . 
     The longitudinal transistor T r   1  is configured to have a gate electrode  21  formed to be embedded to an inner portion of the semiconductor substrate  11  from the side of the surface  15  of the semiconductor substrate  11 . 
     Thereby, the first photoelectric conversion unit PD 1  is connected to a channel formed by the longitudinal transistor T r   1 . 
     In addition, a floating diffusion (FD)  22  is provided in the surface  15  of the semiconductor substrate  11  of the right side of the gate electrode  21  of the longitudinal transistor T r   1 . 
     In addition, the first photoelectric conversion unit PD 1  is formed over the side of the back surface  16  of a portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . 
     In addition, a light shielding film  25  is formed to cover a portion of the back surface (light incident surface)  16  of the semiconductor substrate  11  in which the first photoelectric conversion unit PD 1  is not formed. 
     Here, a solid-state imaging device having a structure according to the related art in which a plurality of photoelectric conversion units are stacked in a semiconductor substrate will be described with reference to  FIGS.  10 A,  10 B and  11   , for comparison with the present technique. 
     Cross-sectional views of the solid-state imaging device having the structure according to the related art are illustrated in  FIGS.  10 A and  10 B . 
     As illustrated in  FIG.  10 A , in the solid-state imaging device, an implantation plug  60  formed to extend in a vertical direction of a semiconductor substrate  51  is used in charge transferring from a second photoelectric conversion unit PD 2  for red R formed in a deep place of the semiconductor substrate  51 . 
     The implantation plug  60  is configured by an impurity region formed to extend in the vertical direction of the semiconductor substrate  51  continuously from an impurity region of the second photoelectric conversion unit PD 2 , by ion implantation of impurity. 
     In addition, the charge obtained by the second photoelectric conversion unit PD 2  passes through the implantation plug  60  and is accumulated in a portion where reading is enabled at a field of a transfer gate  52  on a surface of the semiconductor substrate  51 . 
     Meanwhile, a transfer gate  54  on the surface of the semiconductor substrate  51  is used in charge transferring from a first photoelectric conversion unit PD 1  for blue B formed in a shallow place of the semiconductor substrate  51 . 
     In addition, a light shielding film  56  is formed above the semiconductor substrate  51  to cover a portion other than the first photoelectric conversion unit PD 1 . 
     Next, an operation when the charge is read is illustrated in  FIG.  10 B . 
     When the charge is read, the left transfer gate  54  is turned on and the charge of the first photoelectric conversion unit PD 1  is read to a left floating diffusion (FD)  55 , as shown by an arrow in  FIG.  10 B . 
     In addition, the right transfer gate  52  is turned on and the charge of the implantation plug  60  of the second photoelectric conversion unit PD 2  is read to a right floating diffusion (FD)  53 , as shown by an arrow in  FIG.  10 B . 
     Because the implantation plug  60  is formed to extend from the deep place to the shallow place of the semiconductor substrate  51 , as the implantation plug  60  advances toward the shallow place, a wavelength of light to be absorbed becomes short. 
     For this reason, if light leaks into the implantation plug  60  during the charge accumulation, a signal of the photoelectric conversion unit PD 2  of red R may be mixed with a signal of a short wavelength of blue or the like. 
     Therefore, an upper side of the implantation plug  60  is covered with the light shielding film  56  to perform superior color separation. 
     However, if the size of the solid-state imaging element decreases or the number of pixels of the solid-state imaging element increases and a pixel size decreases, an amount of light to be obliquely incident increases. 
     If the amount of light to be obliquely incident increases, as illustrated in  FIG.  11   , the light to be obliquely incident is incident on the implantation plug  60  of the lower side of the light shielding film  56  and the charge generated from the red R light and the charge generated from the blue B light or the like having the short wavelength may be mixed in the implantation plug  60 . Thereby, color mixture is generated in the signal charge and a color separation characteristic is degraded. 
     In addition, because the light shielding film  56  is formed to cover the upper side of the implantation plug  60 , an opening of the light shielding film  56  is narrowed by an amount corresponding to the implantation plug  60  and an aperture ratio decreases. According to the decrease in the aperture ratio, sensitivity decreases. 
     In the structure according to the related art illustrated in  FIGS.  10 A,  10 B and  11   , the implantation plug  60  is formed from the second photoelectric conversion unit PD 2  formed in the deep place of the semiconductor substrate  51  to the vicinity of the surface of the semiconductor substrate  51  and a structure having a different absorption wavelength band is connected. For this reason, it is necessary to form the light shielding film  56  becoming the cause of the decrease in the aperture ratio on the implantation plug  60 . 
     Meanwhile, in the structure according to this embodiment, the charge generated in the first photoelectric conversion unit PD 1  formed in the deep place of the semiconductor substrate  11  is read by the longitudinal transistor T r   1 . 
     Because the structure according to this embodiment is a back surface radiation type structure, the first photoelectric conversion unit PD 1  formed at the side of the back surface (light incident surface)  16  of the semiconductor substrate  11  is formed at the side opposite to the surface  15  to be a circuit formation surface. 
     Because a transfer gate is not provided at the side of the back surface  16  to be the light incident surface, a ratio of an opening width with respect to the aperture ratio, that is, the pixel size can be maximized by forming the first photoelectric conversion unit PD 1  widely. Thereby, the sensitivity can be maximized. 
     In addition, an area of the second photoelectric conversion unit PD 2  formed at the side of the surface  15  of the semiconductor substrate  11  can be increased, because the implantation plug  60  of the structure according to the related art is not provided. 
     In addition, because the longitudinal transistor T r   1  is used in reading, the depth of the first photoelectric conversion unit PD 1  formed in the deep portion of the semiconductor substrate  11  can be made to be constant and the first photoelectric conversion unit PD 1  can only have a constant wavelength absorption band. Thereby, the color mixture that is generated by the implantation plug  60  of the structure according to the related art illustrated in  FIGS.  10 A and  10 B  can be prevented from being generated. 
     However, in actuality, during a charge transfer period during which the charge is transferred to the floating diffusion  21  using the longitudinal transistor T r   1 , the first photoelectric conversion unit PD 1  formed in the deep portion of the semiconductor substrate  11  and the channel portion formed around the longitudinal transistor T r   1  are connected. For this reason, during the charge transfer period, photoelectric conversion components of portions having the different depths in the semiconductor substrate  11  are added, similarly to the structure according to the related art. 
     However, because the charge transfer period during which the longitudinal transistor T r   1  is turned on is sufficiently shorter than the charge accumulation period, a mixture color component during the charge transfer period can be ignored. 
     During the charge accumulation period, the longitudinal transistor T r   1  is turned off and the channel is not formed around the first photoelectric conversion unit PD 1  and the longitudinal transistor T r   1 . Therefore, the photoelectric conversion components of the portions having the different depths in the semiconductor substrate  11  are not added. 
     In addition, the longitudinal transistor T r   1  is used, so that the photoelectric conversion unit can be extended to a region not helpful for the photoelectric conversion by the formation of the implantation plug  60  in the structure according to the related art illustrated in  FIGS.  10 A and  10 B . 
     In addition, because it is not necessary to form the light shielding film  25  to suppress the color mixture in the portion of the longitudinal transistor T r   1 , the aperture ratio can be improved. 
     According to the configuration of the solid-state imaging device according to this embodiment described above, the signal charge on which the photoelectric conversion has been executed by the first photoelectric conversion unit PD 1  formed at the side of the back surface  16  of the semiconductor substrate  11  is read using the longitudinal transistor T r   1 . 
     Thereby, during the charge accumulation period during which the longitudinal transistor T r   1  is turned off, because the channel is not formed around the first photoelectric conversion unit PD 1  and the longitudinal transistor T r   1 , the signal charge by the light having the different wavelengths is not mixed. That is, the color mixture is not generated. 
     In addition, because the color mixture is not generated even though the portion of the gate electrode  21  of the longitudinal transistor T r   1  is not covered with the light shielding film  25 , the sensitivity can be improved by increasing the aperture ratio of the light shielding film  25 . 
     In addition, the first photoelectric conversion unit PD 1  is formed over the side of the back surface  16  of the portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . 
     Thereby, as compared with the structure in which the implantation plug is formed, the sensitivity can be improved by increasing the area of the first photoelectric conversion unit PD 1 . 
     Therefore, because the color mixture is not generated by the configuration according to this embodiment, a solid-state imaging device having superior color separation and high sensitivity can be realized. 
     2. Second Embodiment (Solid-State Imaging Device) 
     A schematic structural view (a cross-sectional view of a main portion) of a solid-state imaging device according to a second embodiment is illustrated in  FIG.  3   .  FIG.  3    illustrates a cross-sectional view of one pixel of the solid-state imaging device, similarly to  FIG.  2   . 
     In the solid-state imaging device according to this embodiment, a structure of a solid-state imaging element is set as a so-called surface radiation type structure in which light is made to be incident from the same side as a circuit or a wiring line to a semiconductor substrate in which a light receiving unit is formed. 
     In this embodiment, as illustrated in  FIG.  3   , a first photoelectric conversion unit PD 1  to execute photoelectric conversion on blue B light is formed in a portion of the side of a surface  15  in a semiconductor substrate  11  and a second photoelectric conversion unit PD 2  to execute photoelectric conversion on red R light is formed in a portion of the side of a back surface  16  in the semiconductor substrate  11 . That is, an array of the first photoelectric conversion unit PD 1  and the second photoelectric conversion unit PD 2  at the side of the surface  15  and the side of the back surface  16  of the semiconductor substrate  11  is opposite to the case of  FIG.  2   . 
     In addition, a light reception surface on which light is incident is formed at the side of the surface  15  of the semiconductor substrate  11 . 
     In addition, although not illustrated in the drawings, a circuit including a so-called read circuit and the like is formed at the side of the surface  15  of the semiconductor substrate  11 . 
     In the first photoelectric conversion unit PD 1  of the side of the surface  15  of the semiconductor substrate  11 , a floating diffusion (FD)  24  is provided at the left side through a transfer gate  23 . 
     In this embodiment, particularly, a longitudinal transistor T r   1  is connected to the second photoelectric conversion unit PD 2  of the side of the back surface  16  of the semiconductor substrate  11 . 
     The longitudinal transistor T r   1  is configured to have a gate electrode  21  formed to be embedded to an inner portion of the semiconductor substrate  11  from the side of the surface  15  of the semiconductor substrate  11 . 
     Thereby, the second photoelectric conversion unit PD 2  is connected to a channel formed by the longitudinal transistor T r   1 . 
     In addition, a floating diffusion (FD)  22  is provided in the surface  15  of the semiconductor substrate  11  of the right side of the gate electrode  21  of the longitudinal transistor T r   1 . 
     In addition, the second photoelectric conversion unit PD 2  is formed over the side of the back surface  16  of a portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . 
     In addition, a light shielding film  25  is formed to cover a portion of the surface (a light incident surface and a circuit formation surface)  15  of the semiconductor substrate  11  in which the first photoelectric conversion unit PD 1  is not formed. 
     In the structure according to this embodiment, the charge generated in the second photoelectric conversion unit PD 2  formed in a deep place of the semiconductor substrate  11  is read by the longitudinal transistor T r   1 . 
     By this structure, areas of the first photoelectric conversion unit PD 1  and the second photoelectric conversion unit PD 2  can be increased as compared with the structure according to the related art illustrated in  FIGS.  10 A and  10 B . 
     That is, because the implantation plug  60  of the structure according to the related art illustrated in  FIG.  10   a    and B is not provided, a region of the first photoelectric conversion unit PD 1  formed at the side of the surface  15  of the semiconductor substrate  11  can be increased and an area thereof can be increased, as compared with the structure according to the related art. 
     Meanwhile, the second photoelectric conversion unit PD 2  formed at the side of the back surface  16  is formed over the side of the back surface  16  of the portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11  and is extended to almost the same area as an opening of the light shielding film  25 . Thereby, a ratio of a width of the photoelectric conversion unit with respect to a pixel size can be maximized and high sensitivity can be obtained. 
     The other configuration is the same as the configuration of the first embodiment and the structure illustrated in the plan view of  FIG.  1    can be adopted. 
     According to the configuration of the solid-state imaging device according to this embodiment described above, the signal charge on which the photoelectric conversion has been executed by the second photoelectric conversion unit PD 2  formed at the side of the back surface  16  of the semiconductor substrate  11  is read using the longitudinal transistor T r   1 . 
     Thereby, during a charge accumulation period during which the longitudinal transistor T r   1  is turned off, because a channel is not formed around the second photoelectric conversion unit PD 2  and the longitudinal transistor T r   1 , the color mixture is not generated. 
     In addition, because the color mixture is not generated even though the portion of the gate electrode  21  of the longitudinal transistor T r   1  is not covered with the light shielding film  25 , the sensitivity can be improved by increasing the aperture ratio of the light shielding film  25 . 
     In addition, the second photoelectric conversion unit PD 2  is formed over the side of the back surface  16  of the portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . 
     Thereby, as compared with the structure in which the implantation plug is formed, the sensitivity can be improved by increasing the area of the second photoelectric conversion unit PD 2 . 
     Therefore, because the color mixture is not generated by the configuration according to this embodiment, a solid-state imaging device having superior color separation and high sensitivity can be realized. 
     3. Third Embodiment (Solid-State Imaging Device) 
     A schematic structural view (a cross-sectional view of a main portion) of a solid-state imaging device according to a third embodiment is illustrated in  FIG.  4   .  FIG.  4    illustrates a cross-sectional view of one pixel of the solid-state imaging device, similarly to  FIGS.  2  and  3   . 
     The solid-state imaging device according to this embodiment has a back surface radiation type structure in which photoelectric conversion units of three layers are stacked in a semiconductor substrate. 
     In this embodiment, as illustrated in  FIG.  4   , the photoelectric conversion units of the three layers are stacked from the side of a back surface (light incident surface)  16  of a semiconductor substrate  11  and a third photoelectric conversion unit PD 3  of green G is provided between the two photoelectric conversion units PD 1  and PD 2  according to the first embodiment. 
     Similarly to the first embodiment, a longitudinal transistor T r   1  is used in reading the charge from the first photoelectric conversion unit PD 1 . 
     In this embodiment, a second longitudinal transistor T r   2  is used in charge reading from the third photoelectric conversion unit PD 3 . That is, the third photoelectric conversion unit PD 3  is connected to a channel formed by the second longitudinal transistor T r   2 . 
     The length of a portion  26 A of a gate electrode  26  of the second longitudinal transistor T r   2  to be embedded in a semiconductor substrate  11  is shorter than the length of a portion  21 A of a gate electrode  21  of the first longitudinal transistor T r   1  to be embedded in the semiconductor substrate  11 . 
     In addition, a transfer gate formed on a portion not illustrated in the drawings on a surface  15  of the semiconductor substrate  11  is used in charge reading from the second photoelectric conversion unit PD 2 . The transfer gate has the same configuration as the transfer gate  23  of  FIG.  2    and reads the signal charge from the second photoelectric conversion unit PD 2  to a floating diffusion (FD) not illustrated in the drawings. 
     The third photoelectric conversion unit PD 3  is formed over the side of the back surface  16  of the portion  26 A of the gate electrode  26  of the second longitudinal transistor T r   2  embedded in the semiconductor substrate. 
     The first photoelectric conversion unit PD 1  is formed from the side of the back surface  16  of the portion  26 A of the gate electrode  26  of the second longitudinal transistor T r   2  embedded in the semiconductor substrate to the side of the back surface  16  of the portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . 
     Because the other configuration is the same as the configuration of the first embodiment illustrated in  FIGS.  1  and  2   , overlapped description is omitted. 
     According to the configuration of the solid-state imaging device according to this embodiment described above, the signal charge on which the photoelectric conversion has been executed by the first photoelectric conversion unit PD 1  and the third photoelectric conversion unit PD 3  formed in the semiconductor substrate  11  is read using the longitudinal transistors T r   1  and T r   2 . 
     Thereby, during a charge accumulation period during which the longitudinal transistors T r   1  and T r   2  are turned off, because a channel is not formed around the first photoelectric conversion unit PD 1  or the third photoelectric conversion unit PD 3  and the longitudinal transistor T r   1 , the color mixture is not generated. 
     In addition, because the color mixture is not generated even though the portion of the gate electrode  21  of the longitudinal transistor T r   1  is not covered with a light shielding film  25 , sensitivity can be improved by increasing an aperture ratio of the light shielding film  25 . 
     In addition, the first photoelectric conversion unit PD 1  is formed over the side of the back surface  16  of the portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . In addition, the third photoelectric conversion unit PD 3  is formed over the side of the back surface  16  of the portion  26 A of the gate electrode  26  of the second longitudinal transistor T r   2  embedded in the semiconductor substrate  11 . 
     Thereby, as compared with the structure in which the implantation plug is formed, the sensitivity can be improved by increasing the areas of the first photoelectric conversion unit PD 1  and the third photoelectric conversion unit PD 3 . 
     Therefore, because the color mixture is not generated by the configuration according to this embodiment, a solid-state imaging device having superior color separation and high sensitivity can be realized. 
     4. Fourth Embodiment (Solid-State Imaging Device) 
     A schematic structural view (a cross-sectional view of a main portion) of a solid-state imaging device according to a fourth embodiment is illustrated in  FIG.  5   .  FIG.  5    illustrates a cross-sectional view of one pixel of the solid-state imaging device, similarly to  FIGS.  2  to  4   . 
     The solid-state imaging device according to this embodiment has a back surface radiation type structure in which photoelectric conversion units of three layers are stacked in a semiconductor substrate, similarly to the third embodiment illustrated in  FIG.  4   . 
     In this embodiment, almost an entire portion has the same configuration as the configuration of the third embodiment illustrated in  FIG.  4   . However, a partial configuration is different from the configuration of the third embodiment. 
     That is, in this embodiment, as illustrated in  FIG.  5   , the length of a portion  26 A of a gate electrode  26  of a second longitudinal transistor T r   2  embedded in a semiconductor substrate  11  is almost the same as the length of a portion  21 A of a gate electrode  21  of a first longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . 
     In addition, a first photoelectric conversion unit PD 1   is formed not to overlap the portion  26 A of the gate electrode  26  of the second longitudinal transistor T r   2  embedded in the semiconductor substrate  11 . 
     According to the configuration of the solid-state imaging device according to this embodiment described above, the signal charge on which the photoelectric conversion has been executed by the first photoelectric conversion unit PD 1  and a third photoelectric conversion unit PD 3  formed in the semiconductor substrate  11  is read using the longitudinal transistors T r   1  and T r   2 . 
     Thereby, during a charge accumulation period during which the longitudinal transistors T r   1  and T r   2  are turned off, because a channel is not formed around the first photoelectric conversion unit PD 1  or the third photoelectric conversion unit PD 3  and the longitudinal transistor T r   1 , the color mixture is not generated. 
     In addition, because the color mixture is not generated even though the portion of the gate electrode  21  of the longitudinal transistor T r   1  is not covered with a light shielding film  25 , sensitivity can be improved by increasing an aperture ratio of the light shielding film  25 . 
     In addition, the first photoelectric conversion unit PD 1  is formed over the side of a back surface  16  of the portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . In addition, the third photoelectric conversion unit PD 3  is formed over the portion  26 A of the gate electrode  26  of the second longitudinal transistor T r   2  embedded in the semiconductor substrate  11 . 
     Thereby, as compared with the structure in which the implantation plug is formed, the sensitivity can be improved by increasing the areas of the first photoelectric conversion unit PD 1  and the third photoelectric conversion unit PD 3 . 
     Therefore, because the color mixture is not generated by the configuration according to this embodiment, a solid-state imaging device having superior color separation and high sensitivity can be realized. 
     Here, if the configuration of the third embodiment and the configuration of the fourth embodiment are compared with each other, advantages of the configurations are as follows. 
     In the third embodiment, because the area of the first photoelectric conversion unit PD 1  is large, sensitivity of read R light can be improved. 
     In the fourth embodiment, because the depths of the gate electrodes  21  and  26  of the two longitudinal transistors T r   1  and T r   2  in the semiconductor substrate are almost the same, holes to bury the gate electrodes  21  and  26  in the semiconductor substrate  11  can be simultaneously formed. Thereby, it is necessary to sequentially form the holes having the different depths in the semiconductor substrate  11 . As compared with the structure of the third embodiment, the number of manufacturing processes can be decreased. 
     The configuration in which the photoelectric conversion units of the three layers are stacked in the semiconductor substrate is not limited to the back surface radiation type structure like the third embodiment or the fourth embodiment and can be applied to a surface radiation type structure. 
     5. Fifth Embodiment (Solid-State Imaging Device) 
     A schematic structural view (a cross-sectional view of a main portion) of a solid-state imaging device according to a fifth embodiment is illustrated in  FIG.  6   .  FIG.  6    illustrates a cross-sectional view of one pixel of the solid-state imaging device, similarly to  FIGS.  2  to  5   . 
     The solid-state imaging device according to this embodiment has a combination configuration of a structure in which photoelectric conversion units of two layers are stacked in a semiconductor substrate and the charge is read using a longitudinal transistor and a stacked type photoelectric conversion layer having a color filter function and a photoelectric conversion function arranged at the side of a light incident surface. 
     In this embodiment, as illustrated in  FIG.  6   , a first photoelectric conversion unit PD 1  and a second photoelectric conversion unit PD 2  are formed in a semiconductor substrate  11  and a gate electrode  21  of a longitudinal transistor T r   1  is formed to be embedded in the semiconductor substrate  11  from the side of a surface  15  of the semiconductor substrate  11 . 
     In addition, the first photoelectric conversion unit PD 1  of blue B is formed at the side of a back surface  16  of the semiconductor substrate  11  and the second photoelectric conversion unit PD 2  of red R is formed at the side of the surface  15  of the semiconductor substrate  11 . 
     The first photoelectric conversion unit PD 1  is formed over the side of the back surface  16  of a portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . 
     This configuration is almost the same as the configuration according to the first embodiment illustrated in  FIG.  2   . 
     In this embodiment, one organic photoelectric conversion unit that receives green G light and detects the light is provided at the side of the back surface  16  of the semiconductor substrate  11 . 
     The organic photoelectric conversion unit is configured by sandwiching an organic photoelectric conversion layer  32  made of an organic photoelectric conversion material between a first electrode  31  of the light incident side and a second electrode  33  of the side of the semiconductor substrate  11 . 
     The organic photoelectric conversion layer  32  has a function of a color filter that absorbs green G light, executes photoelectric conversion, and transmits blue B and red R light. 
     The first electrode  31  and the second electrode  33  are formed of a transparent conductive material. 
     As the transparent conductive material of the first electrode  31  and the second electrode  33 , for example, indium tin oxide (ITO), indium zinc oxide, and the like can be used. 
     As an organic photoelectric conversion material of the organic photoelectric conversion layer  32  that executes photoelectric conversion with green G light, for example, organic photoelectric conversion materials including a rhodamine pigment, a merocyanine pigment, quinacridone, and the like can be used. 
     The second electrode  33  of the organic photoelectric conversion unit is electrically connected to the semiconductor substrate  11  through a wiring layer  34  having a section of a cross shape. 
     In a portion of the side of the back surface  16  of the semiconductor substrate  11  connected to the wiring layer  34 , a contact region  30  is formed. 
     In addition, a charge accumulation region  29  is formed in the semiconductor substrate  11  to be connected to the contact region  30 . 
     The charge on which the photoelectric conversion has been executed by the organic photoelectric conversion layer  32  passes the contact region  30  via the second electrode  33  and the wiring layer  34  and is accumulated in the charge accumulation region  29  in the semiconductor substrate  11 . 
     The charge that is accumulated in the charge accumulation region  29  is read to a floating diffusion (FD)  28  formed at the side of the surface  15  of the semiconductor substrate  11 , by a transfer gate  27 . 
     The wiring layer  34  is preferably formed of a metal material having a light shielding property such as tungsten, such that the wiring layer  34  functions as a light shielding film for the charge accumulation region  29 . 
     The organic photoelectric conversion layer  32  of the organic photoelectric conversion unit is formed to include a portion of the side of the back surface  16  of the gate electrode  21  of the longitudinal transistor T r   1  and a portion of the side of the back surface  16  of the charge accumulation region  29  and have an area larger than the area of the first photoelectric conversion unit PD 1 . Thereby, as compared with the configuration in which the organic photoelectric conversion layer is formed to have almost the same area as the area of the photoelectric conversion unit in the semiconductor substrate, sensitivity of green G light in the organic photoelectric conversion layer  32  can be improved. 
     According to the configuration of the solid-state imaging device according to this embodiment described above, the signal charge on which the photoelectric conversion has been executed by the first photoelectric conversion unit PD 1  formed at the side of the back surface  16  of the semiconductor substrate  11  is read using the longitudinal transistor T r   1 . 
     Thereby, during a charge accumulation period during which the longitudinal transistor T r   1  is turned off, because a channel is not formed around the first photoelectric conversion unit PD 1  and the longitudinal transistor T r   1 , the color mixture is not generated. 
     In addition, the first photoelectric conversion unit PD 1  is formed over the side of the back surface  16  of the portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . 
     Thereby, as compared with the structure in which the implantation plug is formed, the sensitivity can be improved by increasing the area of the first photoelectric conversion unit PD 1 . 
     In addition, the organic photoelectric conversion layer  32  of the organic photoelectric conversion unit is formed to have the area larger than the area of the first photoelectric conversion unit PD 1 . Thereby, as compared with the configuration in which the organic photoelectric conversion layer is formed to have almost the same area as the area of the first photoelectric conversion unit, sensitivity of green G light in the organic photoelectric conversion layer  32  can be improved. 
     Therefore, because the color mixture is not generated by the configuration according to this embodiment, a solid-state imaging device having superior color separation and high sensitivity can be realized. 
     In the embodiment described above, as the combination of the colors, the organic photoelectric conversion unit is set as green G, the first photoelectric conversion unit is set as blue B, and the second photoelectric conversion unit is set as red R. However, other color combinations can be used. 
     For example, the organic photoelectric conversion unit can be set as red R or blue B and the two photoelectric conversion units in the semiconductor substrate can be set as other corresponding colors. 
     As the organic photoelectric conversion material to execute the photoelectric conversion with red R light, organic photoelectric conversion materials including a phthalocyanine pigment can be used. 
     As the organic photoelectric conversion material to execute the photoelectric conversion with blue B light, organic photoelectric conversion materials including a coumarin pigment, a merocyanine pigment, and the like can be used. 
     In addition, a combination of the organic photoelectric conversion layer and the photoelectric conversion unit according to the present technique can be applied to a surface radiation type structure. 
     In this case, as the photoelectric conversion units formed in the semiconductor substrate, the first photoelectric conversion unit PD 1  of the blue B and the second photoelectric conversion unit PD 2  of the red R are arranged from the side of the light incident surface and the charge generated in the second photoelectric conversion unit PD 2  of the red R is read using the longitudinal transistor, similarly to the second embodiment. 
     6. Sixth Embodiment (Solid-State Imaging Device) 
     A schematic structural view (a cross-sectional view of a main portion) of a solid-state imaging device according to a sixth embodiment is illustrated in  FIG.  7   .  FIG.  7    illustrates a cross-sectional view of two adjacent pixels of the solid-state imaging device. 
     The solid-state imaging device according to this embodiment has a combination configuration of a structure in which photoelectric conversion units of two layers are stacked in a semiconductor substrate and the charge is read using a longitudinal transistor and a structure in which a photoelectric conversion unit of one layer is formed in the semiconductor substrate according to the related art and the charge is read using a transfer gate. 
      In this embodiment, as illustrated in  FIG.  7   , a first photoelectric conversion unit PD 1  and a second photoelectric conversion unit PD 2  are formed in a semiconductor substrate  11  and a gate electrode  21  of a longitudinal transistor T r   1  is formed to be embedded in the semiconductor substrate  11  from the side of a surface  15  of the semiconductor substrate  11 . 
     In addition, the first photoelectric conversion unit PD 1  of blue B is formed at the side of a back surface  16  of the semiconductor substrate  11  and the second photoelectric conversion unit PD 2  of red R is formed at the side of the surface  15  of the semiconductor substrate  11 . 
     The first photoelectric conversion unit PD 1  is also formed over the side of the back surface  16  of a portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . 
     In addition, a light shielding film  25  is formed to cover a portion other than the first photoelectric conversion unit PD 1  of the side of the back surface  16  of the semiconductor substrate  11 . 
     This configuration is almost the same as the configuration according to the first embodiment illustrated in  FIG.  2   . 
     In this embodiment, in a first pixel in which the first photoelectric conversion unit PD 1  and the second photoelectric conversion unit PD 2  are formed, a color filter  35  of Magenta (Mg) is provided to be closer to the light incident side than the light shielding film  25 . 
     In addition, in a second pixel adjacent to the first pixel, a third photoelectric conversion unit PD 3  of green G is formed in the semiconductor substrate  11  and a color filter  36  of green (G) is provided to be closer to the light incident side than the light shielding film  25 . In addition, a transfer gate  27  to transfer the charge on which the photoelectric conversion has been executed by the third photoelectric conversion unit PD 3  and a floating diffusion (FD)  28  to which the charge transferred by the transfer gate  27  is transferred are provided at the side of a surface  15  of the semiconductor substrate  11 . 
     In addition, a planar array of color filters in this embodiment is illustrated in  FIG.  8   . 
     As illustrated in  FIG.  8   , color filters of magenta (Mg) and color filters of green (G) are arranged in a checkered pattern. 
     The planar array of the color filters is not limited to a checkered array illustrated in  FIG.  8    and other planar array can be used. 
     In addition, kinds of colors of used color filters are not limited to two kinds of magenta and green and other combination can be used. 
     According to the configuration of the solid-state imaging device according to this embodiment described above, the signal charge on which the photoelectric conversion has been executed by the first photoelectric conversion unit PD 1  formed at the side of the back surface  16  of the semiconductor substrate  11  is read using the longitudinal transistor T r   1 . 
     Thereby, during a charge accumulation period during which the longitudinal transistor T r   1  is turned off, because a channel is not formed around the first photoelectric conversion unit PD 1  and the longitudinal transistor T r   1 , the color mixture is not generated. 
     In addition, the first photoelectric conversion unit PD 1  is formed over the side of the back surface  16  of the portion  21 A of the gate electrode  21  of the longitudinal transistor T r   1  embedded in the semiconductor substrate  11 . 
     Thereby, as compared with the structure in which the implantation plug is formed, the sensitivity can be improved by increasing the area of the first photoelectric conversion unit PD 1 . 
     Therefore, because the color mixture is not generated by the configuration according to this embodiment, a solid-state imaging device having superior color separation and high sensitivity can be realized. 
     7. Modification of Solid-State Imaging Device 
     In the solid-state imaging device according to the present technique, the configurations of the pixel unit and the peripheral circuit unit are not limited to the configurations illustrated in  FIG.  1    and other configurations can be used. 
     In each embodiment described above, the photoelectric conversion units PD 1 , PD 2 , and PD 3  composed of the photodiodes are formed in the semiconductor substrate such as the silicon substrate. 
     In the present technique, the semiconductor layer to form the photoelectric conversion units of the plurality of layers to be stacked is not limited to the semiconductor substrate and a semiconductor substrate in which a semiconductor epitaxial layer is formed, a silicon layer on an oxide film of an SOI substrate, or the like can be used. 
     In addition, in the present technique, in addition to silicon, a semiconductor such as Ge or a compound semiconductor can be used as a material of the semiconductor layer. 
     The solid-state imaging device according to the present technique can be applied to a camera system such as a digital camera or a video camera, a mobile phone having an imaging function, and other apparatuses having an imaging function. 
     8. Seventh Embodiment (Imaging Apparatus) 
     A schematic structural diagram (block diagram) of an imaging apparatus according to a seventh embodiment is illustrated in  FIG.  9   . 
     As illustrated in  FIG.  9   , an imaging apparatus  121  has a solid-state imaging device  122 , an optical system  123 , a shutter device  124 , a driving circuit  125 , and a signal processing circuit  126 . 
     The optical system  123  is composed of an optical lens and the like and forms image light (incident light) from a subject on a pixel unit of the solid-state imaging device  122 . Thereby, a signal charge is accumulated in the solid-state imaging device  122  during a constant period. The optical system  123  may be an optical lens system including a plurality of optical lenses. 
     As the solid-state imaging device  122 , the solid-state imaging device according to the present technique such as the solid-state imaging device according to each embodiment described above is used. 
     The shutter device  124  controls a light radiation period and a light shielding period for the solid-state imaging device  122 . 
     The driving circuit  125  supplies a driving signal to control a transmission operation of the solid-state imaging device  122  and a shutter operation of the shutter device  124 . The signal transmission of the solid-state imaging device  122  is performed by the driving signal (timing signal) supplied from the driving circuit  125 . 
     The signal processing circuit  126  executes various signal processes. A video signal on which the signal processes have been executed is stored in a storage medium such as a memory or is output to a monitor. 
     According to the configuration of the imaging apparatus  121  according to this embodiment described above, the solid-state imaging device according to the present technique such as the solid-state imaging device according to each embodiment described above is used as the solid-state imaging device  122 , so that the color mixture can be prevented from being generated and the sensitivity can be improved. 
     In the present technique, the configuration of the imaging apparatus is not limited to the configuration illustrated in  FIG.  9    and any configuration other than the configuration illustrated in  FIG.  9    in which the solid-state imaging device according to the present technique is used can be used. 
     Note that the present disclosure may include the following configurations. 
     (1) A solid-state imaging device including: a semiconductor layer in which a surface side becomes a circuit formation surface; photoelectric conversion units of two layers or more that are stacked and formed in the semiconductor layer; and a longitudinal transistor in which a gate electrode is formed to be embedded in the semiconductor layer from a surface of the semiconductor layer, wherein the photoelectric conversion unit of one layer in the photoelectric conversion units of the two layers or more is formed over a portion of the gate electrode of the longitudinal transistor embedded in the semiconductor layer and is connected to the channel formed by the longitudinal transistor.   (2) The solid-state imaging device according to (1), wherein the solid-state imaging device has a back surface radiation type structure in which a back surface side of the semiconductor layer becomes a light incident surface.   (3) The solid-state imaging device according to (1) or (2), wherein, during a charge accumulation period, the longitudinal transistor is turned off, the channel of the longitudinal transistor is not formed, and a floating diffusion and the photoelectric conversion units are not connected.   (4) The solid-state imaging device according to any of (1) to (3), wherein the photoelectric conversion units of three layers are stacked in the semiconductor layer and one longitudinal transistor is provided for each of the photoelectric conversion unit of the first layer and the photoelectric conversion unit of the second layer from the back surface side of the semiconductor layer, among the photoelectric conversion units of the three layers.   (5) The solid-state imaging device according to any of (1) to (3), further including: a photoelectric conversion unit that is arranged at a light incident surface side of the semiconductor layer and is configured from an organic photoelectric conversion layer.   (6) The solid-state imaging device according to (5), wherein the organic photoelectric conversion layer is formed over the light incident surface side of the gate electrode of the longitudinal transistor.   (7) The solid-state imaging device according to any of (1) to (3), wherein a first pixel having the photoelectric conversion units of two layers that are stacked and formed and a second pixel having a photoelectric conversion unit to execute photoelectric conversion on light of a color different from colors in the photoelectric conversion units of the two layers of the first pixel are included, a pixel unit is configured by regularly arranging the first pixel and the second pixel two-dimensionally, and color filters having different absorption wavelengths are provided on the first pixel and the second pixel, respectively.   (8) An imaging apparatus including: an optical system; a solid-state imaging device according to any of (1) to (7) ; and a signal processing circuit that processes an output signal of the solid-state imaging device.   

     The present technique is not limited to the embodiments described above and other various configurations can be taken without departing from the gist of the present technique. 
     Reference Signs List 
     
         
           1 ,  122  Solid-state imaging device 
           2  Pixel 
           3  Pixel unit 
           4  Vertical driving circuit 
           5  Column signal processing circuit 
           6  Horizontal driving circuit 
           7  Output circuit 
           8  Control circuit 
           9  Vertical signal line 
           10  Horizontal signal line 
           11  Semiconductor substrate 
           12  Input/output terminal 
           15  Surface 
           16  Back surface 
           21 ,  26  Gate electrode 
           22 ,  24 ,  28  Floating diffusion 
           23 ,  27  Transfer gate 
           25  Light shielding film 
           29  Charge accumulation region 
           30  Contact region 
           31  First electrode 
           32  Organic photoelectric conversion layer 
           33  Second electrode 
           34  Wiring layer 
           35 ,  36  Color filter 
           121  Imaging apparatus 
           123  Optical system 
           124  Shutter device 
           125  Driving circuit 
           126  Signal processing circuit 
         PD 1  First photoelectric conversion unit 
         PD 2  Second photoelectric conversion unit 
         PD 3  Third photoelectric conversion unit 
         T r   1  Longitudinal transistor 
         T r   2  Second longitudinal transistor