Patent Publication Number: US-2016247860-A1

Title: Solid-state image sensing device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2015-033097, filed Feb. 23, 2015; the entire contents of which are incorporated herein by reference. 
     FIELD 
     Embodiments described herein relate generally to a solid-state image sensing device. 
     BACKGROUND 
     Solid-state image sensing devices are widely used in various fields in, for example, digital cameras, mobile terminals such as portable telephones (including smartphones), monitoring cameras, web cameras utilizing the internet, and the like. In such solid-state image sensing devices, in order to realize all of high image quality, downsizing, and weight saving, image-sensing devices are proposed which uses an organic photoelectric conversion layer in a photoelectric converter. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cross-sectional view schematically showing the configuration of a solid-state image sensing device according to a first embodiment. 
         FIG. 2  is a cross-sectional view schematically showing a relevant part of the configuration of the solid-state image sensing device according to the first embodiment. 
         FIG. 3  is a cross-sectional view schematically showing a relevant part the configuration of the solid-state image sensing device according to the first embodiment. 
         FIG. 4  is a perspective view showing an example of a CMOS image sensor to which the solid-state image sensing device according to the first embodiment is applied. 
         FIG. 5  is a perspective view showing another example of a CMOS image sensor to which the solid-state image sensing device according to the first embodiment is applied. 
         FIG. 6  is a plan view showing a smartphone serving as an imaging device provided with a CMOS image sensor built therein. 
         FIG. 7  is a plan view showing a tablet terminal device serving as an imaging device provided with a CMOS image sensor built therein. 
         FIG. 8  is a plan view showing an example of an automobile provided with a car-mounted camera and an on-board image display device. 
         FIG. 9  is a plan view showing another example of an automobile provided with a car-mounted camera and an on-board image display device. 
         FIG. 10  is a cross-sectional view schematically showing the configuration of a solid-state image sensing device according to a second embodiment. 
         FIG. 11  is a schematic cross-sectional view showing a configuration of a photoelectric conversion device including a green-light organic photoelectric conversion layer and a red-light organic photoelectric conversion layer which are adjacent to each other. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, a solid-state image sensing device according to the embodiment will be described with reference to drawings. 
     In the drawings used in the below description, in order for the respective components to be of understandable size in the drawings, the dimensions and the proportions of the components are modified as needed compared with the real components. 
     First Embodiment 
       FIG. 1  is a cross-sectional view schematically showing the configuration of a solid-state image sensing device according to a first embodiment. As shown in  FIG. 1 , the solid-state image sensing device  1  according to the embodiment includes a blue-light photoelectric converter  2  (first photoelectric converter), a green-light photoelectric converter  3  (second photoelectric converter), a red-light photoelectric converter  4  (third photoelectric converter), and a substrate  5 . Particularly,  FIG. 1  only shows one pixel of the solid-state image sensing device  1  according to the embodiment including a vertical layered structure in which the photoelectric converters  2 ,  3 , and  4  used for the respective colors are sequentially stacked in layers in the thickness direction on one surface  5   a  of the substrate  5  with insulating layers  6 ,  7 , and  8  interposed therebetween; and the description regarding the other components thereof is omitted. 
     The blue-light photoelectric converter  2  includes an upper transparent electrode  9  (may be referred to as a transparent counter electrode), a lower transparent electrode  10  (may be referred to as a base electrode or a pixel electrode), and a blue-light organic photoelectric conversion layer  11  (first organic photoelectric conversion layer). The blue-light photoelectric converter  2  is provided so that the blue-light organic photoelectric conversion layer  11  is sandwiched between the paired transparent electrodes  9  and  10 . 
     The upper transparent electrode  9  is used to apply a bias voltage supplied from the outside thereof to the blue-light organic photoelectric conversion layer  11 . The upper transparent electrode  9  is provided so as to cover the surface which is located on the opposite side of the substrate  5  and serves as a light-receiving face of the blue-light organic photoelectric conversion layer  11 . As long as a material used to form the upper transparent electrode  9  is a transparent electroconductive material, it is not particularly limited. As such transparent electroconductive material, specifically, for example, indium tin oxide (ITO) or the like is adopted. 
     The lower transparent electrode  10  is used to collect an electrical charge that is generated due to photoelectric conversion by the blue-light organic photoelectric conversion layer  1 . The lower transparent electrode  10  is provided for each pixel on the surface of the blue-light organic photoelectric conversion layer  11  which faces the substrate  5 . As long as a material used to form the lower transparent electrode  10  is a transparent electroconductive material, it is not particularly limited. As such transparent electroconductive material, specifically, for example, indium tin oxide (ITO) or the like is adopted. 
     The blue-light organic photoelectric conversion layer  11  is an organic photoelectric conversion film including a blue-light organic semiconductor material  12  (first organic semiconductor material) and a first organic dye  13 . Of blue light, green light, and red light which are three primary colors of light, the blue-light organic semiconductor material  12  selectively absorbs blue light and allows the other two primary colors of light (i.e., green and red) to be transmitted therethrough. The first organic dye  13  is dispersed in the blue-light organic semiconductor material  12 . 
     Particularly, the blue light of three primary colors of light means light having a wavelength-band of 400 to 500 nm. The green light means light having a wavelength-band of 500 to 600 nm. The red light means light having a wavelength-band of 600 to 700 nm. 
     Moreover, based on a transmission spectrum and a reflection spectrum of visible light of a photoelectric converter, it is possible to determine whether or not each wavelength of light can be selectively absorbed. Furthermore, based on a spectral sensitivity (photoelectric conversion efficiency with respect to irradiation wavelength) of the photoelectric converter during applying voltage thereto, it is possible to evaluate the wavelength selectivity thereof. 
     As the blue-light organic semiconductor material  12 , specifically, a porphyrincobalt complex, a coumarin derivative, fullerene, derivatives thereof, a florene compound, a pyrazole derivative, or the like, for example, can be adopted. As a material used to form the blue-light organic semiconductor material  12 , any one selected from the group consisting of the aforementioned compounds may be used, and a material including two or more selected therefrom may be used. 
     The first organic dye  13  is an organic dye used to receive a lower level of energy than the excitation energy of the blue-light organic semiconductor material  12 . Particularly, the first organic dye is an organic dye which is dispersed in the blue-light organic photoelectric conversion layer  11  (i.e., the blue-light organic semiconductor material  12 ) and absorbs energy corresponding to that of green light. As the above-described organic dye, specifically, a quinacridone derivative, a perylene bisimide derivative, an oligothiophene derivative, a subphthalocyanine derivative, a rhodamine compound, a ketocyanine derivative, or the like, for example, can be adopted. As a material used to form the first organic dye  13 , any one selected from the group consisting of the aforementioned compounds may be used, and a material including two or more selected therefrom may be used together. 
     As long as the blue-light organic photoelectric conversion layer  11  has a layer thickness which can sufficiently absorb the blue light in the blue-light photoelectric converter  2  when the solid-state image sensing device  1  receives light, the thickness thereof is not particularly limited. Specifically, for example, it is only necessary that the thickness be in a range of 30 to 300 nm, and a range of 50 to 200 nm is preferable. 
     In the blue-light organic photoelectric conversion layer  11 , it is preferable that the mass content of the first organic dye  13  be lower than the mass content of the blue-light organic semiconductor material  12 . Particularly, it is preferable that the contained amount (concentration) of the first organic dye  13  contained in the blue-light organic photoelectric conversion layer  11  be 0.75/(N A ·R 3 )(mol/m 3 ) where an energy transfer radius of the blue-light organic semiconductor material  12  is defined as R (m) and Avogadro&#39;s constant is defined as N A  (mol −1 ). 
     Here, the energy transfer radius R of the organic semiconductor material can be determined by the following Formula (1). 
       (Formula 1) 
         R= 0.2108[κ 2 φ a   n   −4   ∫f   a (λ)ε b (λ)λ 4   dλ]   1/6   (1)
 
     In the above-mentioned Formula (1), κ represents an orientation factor and is a value determined from an angle between the transition dipole moment of a donor transmitting energy and an acceptor (organic dye) receiving energy. The φ a  represents a radiative quantum yield when energy transfer is not present. The n represents a refractive index of a medium. The f a  represents a shape function of an emission spectrum of a donor, and the ε b  represents the molar absorptivity of the acceptor (organic dye). 
     The contained amount of the first organic dye  13  in the blue-light organic photoelectric conversion layer  11  may very due to measurement of the aforementioned energy transfer radius R of the organic semiconductor material; and it is preferable that the upper limit thereof be lower than or equal to 46/(ε b ·L) (mol/m 3 ) (Σ b : molar absorptivity of an organic dye, L: film thickness of organic photoelectric conversion layer). As a result of setting the contained amount of the first organic dye  13  in the blue-light organic photoelectric conversion layer  11  to be lower than or equal to the above-mentioned upper limit, it is possible to reduce a transmittance loss (%) due to absorption of an organic dye so as to be within 10% which is substantially the same range as that of color filters. 
     The mass content of the first organic dye  13  in the blue-light organic photoelectric conversion layer  11  can be calculated by, for example, dissolving the blue-light organic photoelectric conversion layer  11 , thereafter carrying out separation thereof by use of high performance liquid chromatography (HPLC) or the like, and then examining the absorbance at each wavelength. 
     Furthermore, by analyzing the first organic dye  13  in the blue-light organic photoelectric conversion layer  11  in the thickness direction by use of secondary ion mass spectrometry (SIMS), it can be determined that the first organic dye  13  is uniformly distributed in the blue-light organic photoelectric conversion layer  11  without being eccentrically-located in the layer thickness direction thereof. 
     Regarding the light received by the solid-state image sensing device  1 , the blue-light photoelectric converter  2  having the above-described configuration absorbs all of the light (i.e., blue light) having a wavelength corresponding to that of the excitation energy of the blue-light organic semiconductor material  12 , the blue-light photoelectric converter absorbs some of the light (i.e., green light) having a wavelength corresponding to a lower level of energy than the excitation energy thereof, and the blue-light photoelectric converter allows the remaining light (remaining portion) to be transmitted therethrough. 
     The insulating layers  6 ,  7 , and  8  are provided to electrically isolate the photoelectric converters constituting the solid-state image sensing device  1  from the photoelectric converter and from the substrate. Specifically, the insulating layer  6  is provided between the blue-light photoelectric converter  2  and the green-light photoelectric converter  3 , the insulating layer  7  is provided between the green-light photoelectric converter  3  and the red-light photoelectric converter  4 , and the insulating layer  8  is provided between the red-light photoelectric converter  4  and the substrate  5 . As long as a material used to form the insulating layers  6 ,  7 , and  8  has an excellent insulation property and an excellent optical transparency, the material is not particularly limited. As such material, for example, silicon oxide (SiO 2 ) can be used. 
     The green-light photoelectric converter  3  includes an upper transparent electrode  14  (transparent counter electrode), a lower transparent electrode  15  (base electrode or a pixel electrode), and a green-light organic photoelectric conversion layer  16  (second organic photoelectric conversion layer). The green-light photoelectric converter  3  is provided so that the green-light organic photoelectric conversion layer  16  is sandwiched between the paired transparent electrodes  14  and  15 . 
     The upper transparent electrode  14  has the same configuration as that of the above-described upper transparent electrode  9 , the lower transparent electrode  15  has the same configuration as that of the above-described lower transparent electrode  10 , and therefore an explanation thereof will be omitted. 
     The green-light organic photoelectric conversion layer  16  is an organic photoelectric conversion film including a green-light organic semiconductor material  17  (second organic semiconductor material) and a second organic dye  18 . Of blue light, green light, and red light which are three primary colors of light, the green-light organic semiconductor material  17  selectively absorbs green light and allows the other two primary colors (i.e., blue and red) of light to be transmitted therethrough. The second organic dye  18  is dispersed in the green-light organic semiconductor material  17 . 
     As the green-light organic semiconductor material  17 , specifically, a quinacridone derivative, a perylene bisimide derivative, an oligothiophene derivative, a subphthalocyanine derivative, a rhodamine compound, a ketocyanine derivative, or the like, for example, can be adopted. As a material used to form the green-light organic semiconductor material  17 , any one selected from the group consisting of the aforementioned compounds may be used, and a material including two or more selected therefrom may be used. 
     The second organic dye  18  is an organic dye used to receive a lower level of energy than the excitation energy of the green-light organic semiconductor material  17 . Particularly, the second organic dye is an organic dye which is dispersed in the green-light organic photoelectric conversion layer  16  (i.e., the green-light organic semiconductor material  17 ) and absorbs energy corresponding to that of red light. As the above-described organic dye, specifically, a phthalocyanine derivative, a squarylium derivative, a subnaphthalocyanine derivative, or the like, for example, can be adopted. As a material used to form the second organic dye  18 , any one selected from the group consisting of the aforementioned compounds may be used, and a material including two or more selected therefrom may be used together. 
     As long as the green-light organic photoelectric conversion layer  16  has a layer thickness which can sufficiently absorb the green light in the green-light photoelectric converter  3  when the solid-state image sensing device  1  receives light, the thickness thereof is not particularly limited. Specifically, for example, it is only necessary that the thickness be in a range of 30 to 300 nm, and a range of 50 to 200 nm is preferable. 
     In the green-light organic photoelectric conversion layer  16 , it is preferable that the mass content of the second organic dye  18  be lower than the mass content of the green-light organic semiconductor material  17 . Particularly, it is preferable that the contained amount of the second organic dye  18  in the green-light organic photoelectric conversion layer  16  be 0.75/(N A ·R 3 )(mol/m 3 ) where an energy transfer radius of the green-light organic semiconductor material  17  is defined as R (m) and Avogadro&#39;s constant is defined as N A  (mol −1 ). 
     Particularly, the energy transfer radius R of the organic semiconductor material and the upper limit of the contained amount of the organic dye in the organic photoelectric conversion layer is the same as in the case of the above-mentioned blue-light organic photoelectric conversion layer  11 . 
     The mass content of the second organic dye  18  in the green-light organic photoelectric conversion layer  16  can be calculated by, for example, dissolving the green-light organic photoelectric conversion layer  16 , thereafter carrying out separation thereof by use of high performance liquid chromatography (HPLC) or the like, and then examining the absorbance at each wavelength. 
     Furthermore, by analyzing the second organic dye  18  in the green-light organic photoelectric conversion layer  16  in the thickness direction by use of secondary ion mass spectrometry (SIMS), it can be determined that the second organic dye  18  is uniformly distributed in the green-light organic photoelectric conversion layer  16  without being eccentrically-located in the layer thickness direction thereof. 
     Regarding the lights (i.e., green light and red light) which are received by the solid-state image sensing device  1  and are passed through the above-described blue-light photoelectric converter  2 , the green-light photoelectric converter  3  having the above-described configuration absorbs all of the light (i.e., green light) having a wavelength corresponding to that of the excitation energy of the green-light organic semiconductor material  17 , the green-light photoelectric converter absorbs some of the light (i.e., red light) having a wavelength corresponding to a lower level of energy than the excitation energy thereof, and the green-light photoelectric converter allows the remaining light to be transmitted therethrough. 
     The red-light photoelectric converter  4  includes an upper transparent electrode  19  (transparent counter electrode), a lower transparent electrode  20  (base electrode or a pixel electrode), and a red-light organic photoelectric conversion layer  21  (third organic photoelectric conversion layer). The red-light photoelectric converter  4  is provided so that the red-light organic photoelectric conversion layer  21  is sandwiched between the paired transparent electrodes  19  and  20 . 
     The upper transparent electrode  19  has the same configuration as that of the above-described upper transparent electrodes  9  and  14 , the lower transparent electrode  20  has the same configuration as that of the above-described lower transparent electrodes  10  and  15 , and therefore an explanation thereof will be omitted. 
     The red-light organic photoelectric conversion layer  21  is an organic photoelectric conversion film including a red-light organic semiconductor material  22  (third organic semiconductor material). Of blue light, green light, and red light which are three primary colors of light, the red-light organic semiconductor material  22  selectively absorbs red light and allows the other two primary colors of light (i.e., blue and green) to be transmitted therethrough. 
     As the red-light organic semiconductor material  22 , specifically, a phthalocyanine derivative, a squarylium derivative, a subnaphthalocyanine derivative or the like, for example, can be adopted. As a material used to form the red-light organic semiconductor material  22 , any one selected from the group consisting of the aforementioned compounds may be used, and a material including two or more selected therefrom may be used. 
     As long as the red-light organic photoelectric conversion layer  21  has a layer thickness which can sufficiently absorb the red light in the red-light photoelectric converter  4  when the solid-state image sensing device  1  receives light, the thickness thereof is not particularly limited. Specifically, for example, it is only necessary that the thickness be in a range of 30 to 300 nm, and a range of 50 to 200 nm is preferable. 
     The red-light photoelectric converter  4  having the above-described configuration absorbs the red light that is received by the solid-state image sensing device  1  and passes through the aforementioned blue-light photoelectric converter  2  and the green-light photoelectric converter  3 . 
     The substrate  5  includes a semiconductor substrate  23 , a charge storage diodes  24 ,  25 , and  26  (hereinbelow, referred to as “SI)”), contact plugs  27 ,  28 , and  29 , and charge transfer lines (for example, CCD system or CMOS system; not shown in the figure) used for reading out a signal charge. 
     The semiconductor substrate  23  is a substrate having a reduced thickness and has a top surface and a back surface which are flat. The semiconductor substrate  23  is not particularly limited to this, for example, a P-type single-crystalline silicon substrate can be used. Hereinafter, the case of using a P-type single-crystalline silicon substrate as the semiconductor substrate  23  will be described an example. 
     The SDs  24 ,  25 , and  26  are provided so that one ends thereof are exposed at the top surface of the semiconductor substrate  23  and the other ends are directed toward the inside of the semiconductor substrate  23 . That is, one end of each of the SDs  24 ,  25 , and  26  is exposed at the top surface of the semiconductor substrate  23 , and the other end of each of the SDs  24 ,  25 , and  26  is directed toward the inside of the semiconductor substrate  23 . Additionally, the SDs  24 ,  25 , and  26  are provided in the semiconductor substrate  23  so as to be separated from each other. As the SDs  24 ,  25 , and  26 , for example, a high concentration N-type impurity diffusion region can be used. 
     Particularly, the SD  24  is electrically connected through the contact plug  27  to the lower transparent electrode  10  forming the blue-light photoelectric converter  2 . The SD  24  has a function of cumulatively storing an electrical charge that is generated from the blue-light organic photoelectric conversion layer  11  sandwiched between the upper transparent electrode  9  and the lower transparent electrode  10 . That is, the SD  24  cumulatively stores an electrical charge corresponding to the blue light that is received by the blue-light organic photoelectric conversion layer  11 . 
     Moreover, the SD  25  is electrically connected through the contact plug  28  to the lower transparent electrode  15  forming the green-light photoelectric converter  3 . The SD  25  has a function of cumulatively storing an electrical charge that is generated from the green-light organic photoelectric conversion layer  16  sandwiched between the upper transparent electrode  14  and the lower transparent electrode  15 . That is, the SD  25  cumulatively stores an electrical charge corresponding to the green light that is received by the green-light organic photoelectric conversion layer  16 . 
     Moreover, the SD  26  is electrically connected through the contact plug  29  to the lower transparent electrode  20  forming the red-light photoelectric converter  4 . The SD  26  has a function of cumulatively storing an electrical charge that is generated from the red-light organic photoelectric conversion layer  21  sandwiched between the upper transparent electrode  19  and the lower transparent electrode  20 . That is, the SD  26  cumulatively stores an electrical charge corresponding to the red light that is received by the red-light organic photoelectric conversion layer  21 . 
     One ends of the contact plugs  27 ,  28 , and  29  are in contact with the SDs  24 ,  25 , and  26 , respectively, and the other ends of the contact plugs  27 ,  28 , and  29  are in contact with the lower transparent electrodes  10 ,  15 , and  20 , respectively. Consequently, the contact plugs  27 ,  28 , and  29  are electrically connected to the SDs  24 ,  25 , and  26  and the lower transparent electrodes  10 ,  15 , and  20 , respectively. As the contact plugs  27 ,  28 , and  29 , for example, a metal material or a high concentration N-type impurity diffusion region can be used. 
     Next, a method of manufacturing the solid-state image sensing device  1  according to the embodiment will be described. 
     First of all, a P-type single-crystalline silicon substrate is prepared as a semiconductor substrate which is not thinned. 
     Subsequently, the SDs  24 ,  25 , and  26  are formed by well-known methods. Specifically, the semiconductor substrate is subjected to ion implantation with N-type impurities (for example, phosphorus), and thereafter the SDs  24 ,  25 , and  26  are thereby formed by annealing. Next, a multilayer wiring structure (not shown in the figure) including a gate insulator film, an insulating film, wiring, and via holes; and transmission transistors (not shown in the figure) are sequentially formed on the top surface of the semiconductor substrate by well-known methods. After that, the semiconductor substrate is thinned so that the SDs  24 ,  25 , and  26  are exposed at the top surface thereof by well-known methods, and the substrate  5  is thereby formed. 
     Subsequently, an insulating film is formed on one surface  5   a  of the substrate  5  by well-known methods. Subsequently, openings are formed on the insulating film so that the surface of the SD  26  is exposed thereto by well-known methods, the openings are filled with an electroconductive material, thereafter the formed layer is subjected to planarization, and the insulating layer  8  and the contact plug  29  are thereby formed. 
     After that, after a transparent-electroconductive film such as ITO is formed on the insulating layer  8  by well-known methods, the transparent-electroconductive film is patterned so as to have a predetermined pixel size, and the lower transparent electrode  20  is thereby formed. Next, after an organic photoelectric conversion film made of the red-light organic semiconductor material  22  is formed by well-known methods such as a vapor-deposition method so as to implant the lower transparent electrode  20  thereinto, the formed layer is subjected to planarization, and the red-light organic photoelectric conversion layer  21  is thereby formed. Subsequently, a transparent-electroconductive film such as ITO is formed on the red-light organic photoelectric conversion layer  21  by well-known methods, the formed layer is subjected to planarization, and the upper transparent electrode  19  is thereby formed. 
     After that, an insulating film is formed by well-known methods so as to cover the top surface of the upper transparent electrode  19 . Next, by well-known methods, through hole are formed on the insulating film so that the surface of the SD  25  is exposed thereto, the through holes are filled with an electroconductive material, thereafter the formed layer is subjected to planarization, and the insulating layer  7  and the contact plug  28  are thereby formed. 
     After that, after a transparent-electroconductive film such as ITO is formed on the insulating layer  7  by well-known methods, the transparent-electroconductive film is patterned so as to have a predetermined pixel size, and the lower transparent electrode  15  is thereby formed. Next, after an organic photoelectric conversion film made of the green-light organic semiconductor material  17  and the second organic dye  18  is formed by well-known methods such as a vapor-deposition method (a multi-source deposition method) so as to implant the lower transparent electrode  15  thereinto, the formed layer is subjected to planarization, and the green-light organic photoelectric conversion layer  16  is thereby formed. Subsequently, a transparent-electroconductive film such as ITO is formed on the green-light organic photoelectric conversion layer  16  by well-known methods, the formed layer is subjected to planarization, and the upper transparent electrode  14  is thereby formed. 
     The method of forming the organic photoelectric conversion film is not particularly limited to this. Not only the above-mentioned vapor-deposition method but also a method of applying a solution containing an organic semiconductor material and an organic dye which are mixed therein at a required ratio of concentration, particularly, for example, a spin coating method, various printing methods (offset printing, inkjet printing, or the like) is adopted as a method of forming an organic photoelectric conversion film. 
     After that, an insulating film is formed by well-known methods so as to cover the top surface of the upper transparent electrode  14 . Next, by well-known methods, through hole are formed on the insulating film so that the surface of the SD  24  is exposed thereto, the through holes are filled with an electroconductive material, thereafter the formed layer is subjected to planarization, and the insulating layer  6  and the contact plug  27  are thereby formed. 
     After that, after a transparent-electroconductive film such as ITO is formed on the insulating layer  6  by well-known methods, the transparent-electroconductive film is patterned so as to have a predetermined pixel size, and the lower transparent electrode  10  is thereby formed. Next, after an organic photoelectric conversion film made of the blue-light organic semiconductor material  12  and the first organic dye  13  is formed by well-known methods such as a vapor-deposition method (a multi-source deposition method) or various solution application methods so as to implant the lower transparent electrode  10  thereinto, the formed layer is subjected to planarization, and the blue-light organic photoelectric conversion layer  11  is thereby formed. Subsequently, a transparent-electroconductive film such as ITO is formed on the blue-light organic photoelectric conversion layer  11  by well-known methods, the formed layer is subjected to planarization, and the upper transparent electrode  9  is thereby formed. 
     As a result of carrying out the above-described step, it is possible to manufacture, on the substrate  5 , the solid-state image sensing device  1  according to the embodiment in which the photoelectric converters corresponding to the three primary colors of light are stacked in layers. 
     Next, an action of the solid-state image sensing device  1  according to the embodiment will be described. 
     In the solid-state image sensing device  1  according to the embodiment, of the light received by the solid-state image sensing device, blue light is only absorbed by the blue-light organic photoelectric conversion layer  11  and is photoelectrically converted into power. Specifically, a bias voltage is applied between the paired transparent electrodes  9  and  10  in the blue-light photoelectric converter  2 . Subsequently, the blue-light organic photoelectric conversion layer  11  absorbs blue light and photoelectrically converts the light into power, and an electrical charge is generated therefrom. At this time, the amount of the generated electrical charge varies depending on the intensity of the light incident to the organic photoelectric conversion layer. The generated electrical charge is accumulated in the SD  24 . 
     Next, regarding the light that is passed through the blue-light organic photoelectric conversion layer  11 , green light is only absorbed by the green-light organic photoelectric conversion layer  16  and is photoelectrically converted into power. Furthermore, of the light that is passed through the blue-light organic photoelectric conversion layer  11  and the green-light organic photoelectric conversion layer  16 , red light is only absorbed by the red-light organic photoelectric conversion layer  21  and is photoelectrically converted into power. At this time, the amount of the generated electrical charge varies depending on the intensity of the light incident to the organic photoelectric conversion layer. Moreover, the electrical charges which are generated from the green-light organic photoelectric conversion layer  16  and the red-light organic photoelectric conversion layer  21  are accumulated in the SDs  25  and  26 , respectively. 
     However, the color separation characteristics of the photoelectric converters  2 ,  3 , and  4  depends on the optical absorption properties of the organic photoelectric conversion layers  11 ,  16 , and  21 , respectively. 
     Particularly, it is known that, in the photoelectric converter using an organic photoelectric conversion layer, part of exciton that is generated due to absorption of light by an organic semiconductor material forming the organic photoelectric conversion layer is inactivated before charge separation thereof. In the inactivation, there are the cases where thermal radiationless deactivation occurs and emission of light from a lowest excited state occurs. Particularly, in the case of the emission of light, light having a wavelength that is shifted to the longer wavelength side than the wavelength of the absorbed light is emitted from the organic photoelectric conversion layer. Here, in the vertical layered structure in which two or more organic photoelectric conversion layers are stacked in layers in the thickness direction thereof, the light emitted from the organic photoelectric conversion layer serving as the upper layer passes through the other organic photoelectric conversion layer that is located near the above-described organic photoelectric conversion layer, and there is a case where the color separation characteristics becomes degraded. 
     As an example, a case will be described where, as shown in  FIG. 11 , green light G only enters through a green-light organic photoelectric conversion layer  116  to a photoelectric conversion device including a vertical layered structure in which the green-light organic photoelectric conversion layer  116  and the red-light organic photoelectric conversion layer  121  are stacked in layers and located adjacent to each other. Firstly, the green-light organic photoelectric conversion layer  116  absorbs the green light G and thereby generates an exciton. Part of the generated exciton is separated due to charge separation, is transferred to an electrode, and is extracted therefrom as a signal E. 
     On the other hand, the green-light organic photoelectric conversion layer  116  has an exciton whose excitation energy lessens and becomes in a lowest excited state before occurrence of charge separation. This exciton is inactivated by light emission. Red light R 0  that is generated by light emission reaches the near red-light organic photoelectric conversion layer  121  while being unmodified, and the red light is detected as a red light signal. Here, since the red light is not incident to the photoelectric conversion device, the signal obtained by detection of the red light becomes an erroneous signal, and the signal makes the function of the photoelectric conversion device degraded. 
     Particularly, with reference to  FIG. 11 , the case is described as an example where the green light enters through the green-light organic photoelectric conversion layer to the vertical layered body in which the green-light organic photoelectric conversion layer  116  and the red-light organic photoelectric conversion layer  121  are stacked in layers. However, even in the case where the green light enters thereinto through the red-light organic photoelectric conversion layer  121  thereto, the same action as the above-mentioned action occurs. 
     That is, the green light that enters to the vertical layered body through the red-light organic photoelectric conversion layer  121  is transmitted through the red-light organic photoelectric conversion layer  121  and is absorbed by the green-light organic photoelectric conversion layer  116 . Furthermore, since the red light R 0  generated in the green-light organic photoelectric conversion layer  116  is also scattered in the directions other than the incident direction of the green light, the red light R 0  reaches the near red-light organic photoelectric conversion layer  121 , and red light R 0  is detected as a red light signal. 
     In  FIGS. 2 and 3 , the green-light organic photoelectric conversion layer  16  and the red-light organic photoelectric conversion layer  21  of the solid-state image sensing device  1  according to the embodiment are only shown. 
     As shown in  FIG. 2 , in the solid-state image sensing device  1  according to the embodiment, the second organic dye  18  is present in the green-light organic photoelectric conversion layer  16 . When green light enters through the green-light organic photoelectric conversion layer  16  to the solid-state image sensing device  1 , the green-light organic photoelectric conversion layer  16  absorbs the green light, an exciton is generated therefrom. Thereafter, the generated exciton is categorized into two excitons, one of the excitons is separated due to charge separation, is transferred to an electrode, and is extracted therefrom as a signal E, and the other of the excitons whose energy lessens to be in a lowest excited state is inactivated by light emission. 
     Here, in the solid-state image sensing device  1  according to the embodiment, since the exciton gives the excitation energy thereof to the second organic dye  18  before the exciton emits red light and the exciton is inactivated, emission of red light does not occur. After that, the second organic dye  18  that receives the excitation energy and is thereby in an excitation state emits light IR in an infrared region or is inactivated by thermal vibration. 
     According to the solid-state image sensing device  1  according to the embodiment, since the red light does not reach the near red-light organic photoelectric conversion layer  21 , an erroneous signal also does not occur, and it is possible to improve the color separation characteristics while reducing color mixture. 
     Particularly, with reference to  FIG. 2 , the case is described as an example where the green light enters through the green-light organic photoelectric conversion layer  16  to the vertical layered body in which the green-light organic photoelectric conversion layer  16  and the red-light organic photoelectric conversion layer  21  are stacked in layers. However, even in the case where the green light enters thereinto through the red-light organic photoelectric conversion layer  21 , the same action as the above-mentioned action occurs. 
     Additionally, the energy difference of the green-light organic semiconductor material  17  between the lowest excited state and the ground state often corresponds to a wavelength of a red region, and the second organic dye  18  that is added to the green-light organic semiconductor material in order to absorb the energy often absorbs the red light. 
     Here, the case will be described where green light and red light simultaneously enter to the solid-state image sensing device  1  according to the embodiment. 
     Regarding the green light G that is incident to the green-light organic photoelectric conversion layer  16  shown in  FIG. 3 , photoelectric conversion is carried out in the green-light organic photoelectric conversion layer  16  as described above, and red light is simultaneously prevented from being emitted therefrom. 
     On the other hand, regarding the red light R 0 , since the second organic dye  18  that absorbs the red light exists, part of the red light is absorbed during transmission of the red light through the green-light organic photoelectric conversion layer  16 . However, since the concentration thereof is extremely low, most of the red light is not absorbed by the second organic dye and the red light reaches the red-light organic photoelectric conversion layer  21 . The reason for this is that the excitation energy is transferable in a large radius range of approximately 10 nm and, in contrast, absorption of light only occurs at substantially the molecular radius of the organic dye. 
     The concentration of the second organic dye  18  which sufficiently receives the excitation energy generated from the green-light organic semiconductor material  17  is significantly low as compared with the concentration that effects the transmittance even in the case of absorbing the red light R 0 . In the case where the radius at which energy is transferable represents R (m), the required concentration of the second organic dye  18  for preventing the red light from being emitted is 0.75/(N A ·R 3 ) (mol/m 3 ). Moreover, the radius R at which energy is transferable varies depending on a photoelectric conversion material and an organic dye. 
     Particularly, in  FIG. 3 , in the case where the radius R at which energy is transferable is, for example, 10 nm, the required mol concentration of the second organic dye  18  is 4×10 −4  mol/dm 3 . Furthermore, in the case where the molar absorptivity of the second organic dye  18  is 3×10 4  dm 3 /mol cm and thickness of the green-light organic photoelectric conversion layer is 100 nm, the transmittance of the red light R 0  is 99.97%, it is possible to say that, even in the case of absorbing part of the incident red light R 0 , the amount of loss thereof is slight. 
     Particularly, with reference to  FIG. 3 , the case is described as an example where the green light and the red light are simultaneously enter through the green-light organic photoelectric conversion layer  16  to the vertical layered body in which the green-light organic photoelectric conversion layer  16  and the red-light organic photoelectric conversion layer  21  are stacked in layers. However, regarding the incident green light, in the case where the green light and the red light simultaneously enter thereto through the red-light organic photoelectric conversion layer  21 , the same action as the above-mentioned action occurs. That is, in the green-light organic photoelectric conversion layer  16 , since the exciton gives the excitation energy thereof to the second organic dye  18  before the exciton emits red light and the exciton is inactivated, emission of red light does not occur. 
     On the other hand, in the case where the green light and the red light simultaneously enter to the red-light organic photoelectric conversion layer  21 , since all of the incident red light is photoelectrically converted into power by the red-light organic photoelectric conversion layer  21 , the incident red light is not absorbed by the second organic dye  18  in the green-light organic photoelectric conversion layer  16 . 
     Moreover, with reference to  FIGS. 2 and 3 , the case is described as an example where the green light and the red light are simultaneously enter to the solid-state image sensing device  1  according to the embodiment; however, the concentration of the first organic dye  13  and the effect due to the first organic dye in the case where blue light and green light simultaneously enter thereto are the same as the above-mentioned embodiment. 
     The solid-state image sensing device  1  according to the embodiment includes the photoelectric converters  2 ,  3 , and  4  which are stacked in layers in the thickness direction and are provided with the organic photoelectric conversion layers  11 ,  16 , and  21 , respectively. The organic photoelectric conversion layers  11 ,  16 , and  21  selectively absorb three primary colors of light consisting of blue light, green light, and red light which are different from each other, respectively. According to the configuration of the solid-state image sensing device  1  according to the embodiment, since the incident light can be color-separated into the above-described colors and it is possible to photoelectrically convert the incident light into power, it is possible to effectively utilize 100% of three primary colors of light in principle, and it is possible to increase the effective imaging region of each pixel to be substantially 100%. 
     Furthermore, in the solid-state image sensing device  1  according to the embodiment, it is not necessary to provide a color separation prism or a color filter which are required for carrying out color imaging in conventional image-sensing devices, and it is possible to realize a downsized and lightweight solid-state image sensing device. 
     Since the solid-state image sensing device  1  according to the embodiment is configured so that the blue-light organic photoelectric conversion layer  11  includes the first organic dye  13 , the blue-light organic photoelectric conversion layer  11  absorbs blue light and photoelectrically converts the light into power, the exciton gives the excitation energy thereof to the first organic dye  13  before the exciton emits green light and the exciton is inactivated, and emission of green light does not occur. Thereafter, the first organic dye  13 , which receives the excitation energy and is thereby in an excitation state, slightly emits red light or is inactivated by thermal vibration. According to the solid-state image sensing device  1  according to the embodiment, since the green light does not reach the near green-light organic photoelectric conversion layer  16 , an erroneous signal also does not occur, and it is possible to improve the color separation characteristics while reducing color mixture. 
     Particularly, it is conceivable that, since the additive amount of the first organic dye  13  to the blue-light organic photoelectric conversion layer  11  is low, the emission of red light from the first organic dye  13  does not effect the red-light organic photoelectric conversion layer  21 . On the other hand, in order to prevent the influence of the emission of red light due to the aforementioned first organic dye  13 , an organic dye that can absorb red light may be additionally introduced into the blue-light organic photoelectric conversion layer  11 . Moreover, as the first organic dye  13  that is to be introduced into the blue-light organic photoelectric conversion layer  11 , it is preferable to select an organic dye having a low level of light emission efficiency. 
     Since the solid-state image sensing device  1  according to the embodiment is configured so that the green-light organic photoelectric conversion layer  16  includes the second organic dye  18 , the green-light organic photoelectric conversion layer  16  absorbs green light and photoelectrically converts the light into power, the exciton gives the excitation energy thereof to the second organic dye  18  before the exciton emits red light and the exciton is inactivated, and emission of red light does not occur. After that, the second organic dye  18  that receives the excitation energy and is thereby in an excitation state emits light IR in an infrared region or is inactivated by thermal vibration. According to the solid-state image sensing device  1  according to the embodiment, since the red light does not reach the near red-light organic photoelectric conversion layer  21 , an erroneous signal also does not occur, and it is possible to improve the color separation characteristics while reducing color mixture. 
     The configuration of the solid-state image sensing device  1  according to the embodiment is an example. 
     In the first embodiment, as an example of the solid-state image sensing device  1 , a backside-illumination solid-state image sensing device is described. However, the above-described configuration is applicable to a frontside-illumination solid-state image sensing device. In this case in which the configuration is applied to the frontside-illumination solid-state image sensing device, it is possible to obtain the same effect as that of the solid-state image sensing device  1  according to the first embodiment. 
     Additionally, the solid-state image sensing device  1  including the red-light photoelectric converter  4 , the green-light photoelectric converter  3 , and the blue-light photoelectric converter  2  which are stacked on the substrate  5  in layers in this order is described as an example in the first embodiment. However, a three-layered configuration in which photoelectric converters are stacked in layers in an order other than the above-described order is applicable to the solid-state image sensing device. In this case in which the photoelectric converters that are stacked in layers in the other order described above is applied to the solid-state image sensing device, it is possible to obtain the same effect as that of the solid-state image sensing device  1  according to the first embodiment. 
     Particularly, in this case of applying, to the solid-state image sensing device, the three-layered configuration in which the blue-light photoelectric converter  2 , the green-light photoelectric converter  3 , and the red-light photoelectric converter  4  which are stacked on the substrate in layers in this order, it is possible to prevent absorption of incident light due to the first organic dye  13  and the second organic dye  18 . 
     Moreover, the solid-state image sensing device  1  including the first organic dye  13  dispersed in the blue-light organic photoelectric conversion layer  11  and the second organic dye  18  dispersed in the green-light organic photoelectric conversion layer  16  is described as an example in the first embodiment. However, any one of the organic photoelectric conversion layers in which an organic dye is dispersed may be used in the solid-state image sensing device. 
       FIG. 4  is a perspective view showing an example of a CMOS image sensor  41  to which the solid-state image sensing device  1  according to the first embodiment is applied. The CMOS image sensor  41  is a Full-HD (1080p) CMOS image sensor. The CMOS image sensor  41  includes the solid-state image sensing device  1  and a molded resin  42 . 
     The molded resin  42  is provided so as to cover the portions other than a light-receiving face of the solid-state image sensing device  1 . As a result of integrating the solid-state image sensing device  1  and the molded resin  42  into one body, it is possible to protect the solid-state image sensing device  1  from moisture, contaminant, and stress applied from the outside of the solid-state image sensing device. 
     The CMOS image sensor  41  is used in an imaging device, for example, digital cameras, mobile terminals such as portable telephones (including smartphones), monitoring cameras, web cameras utilizing the internet, and the like. 
       FIG. 5  is a perspective view showing another example of a CMOS image sensor to which the solid-state image sensing device according to the first embodiment is applied. The CMOS image sensor  51  is a VGA CMOS image sensor. The CMOS image sensor  51  includes the solid-state image sensing device  1  and a molded resin  52 . 
     The molded resin  52  is provided so as to cover the portions other than a light-receiving face of the solid-state image sensing device  1 . As a result of integrating the solid-state image sensing device  1  and the molded resin  52  into one body, it is possible to protect the solid-state image sensing device  1  from moisture, contaminant, and stress applied from the outside of the solid-state image sensing device. 
     The CMOS image sensor  51  is used in an imaging device, for example, digital cameras, mobile terminals such as portable telephones (including smartphones), monitoring cameras, web cameras utilizing the internet, and the like. 
       FIG. 6  is a plan view showing a smartphone  61  provided with a camera on which the above-mentioned CMOS image sensor  41  or CMOS image sensor  51  is mounted. The smartphone  61  includes a camera (not shown in the figure) and a touch panel  62 . In the case where the camera is provided at, for example, the upper front side of the smartphone  61 , it is possible to image-capture the front side of the smartphone  61 . Furthermore, the touch panel  62  is provided at the center of the smartphone and can display the image that is image-captured by the camera. 
       FIG. 7  is a plan view showing a tablet terminal  71  provided with a camera on which the above-mentioned CMOS image sensor  41  or CMOS image sensor  51  is mounted. The tablet terminal  71  includes a camera (not shown in the figure) and a touch panel  72 . In the case where the camera is provided at, for example, the upper front side of the tablet terminal  71 , it is possible to image-capture the front side of the tablet terminal  71 . Furthermore, the touch panel  72  is provided at the center of the camera and can display the image that is image-captured by the camera. 
       FIG. 8  is a perspective view showing an example of an automobile  81  provided with a camera  82  on which the above-mentioned CMOS image sensor  41  or CMOS image sensor  51  is mounted. The automobile  81  is provided with the camera  82  and a display  83 . The camera  82  is provided on the front end of the automobile  81  and can image-capture the front side of the automobile  81 . Moreover, the display  83  is provided in front of driver&#39;s seat front of the automobile  81  and can display the image that is image-captured by the camera  82 . The driver can check the image that is image-captured by the camera  82  and displayed on the display  83 . For example, the driver can check blind spots of the automobile when the driver parks the automobile. 
       FIG. 9  is a plan view showing another example of an automobile  91  provided with a camera  92  on which the above-mentioned CMOS image sensor  41  or CMOS image sensor  51  is mounted. The automobile  91  is provided with the camera  92  and a display  93 . The camera  92  is provided on the rearward end of the automobile  91  and can image-capture the rear side of the automobile  91 . Moreover, the display  93  is provided in front of driver&#39;s seat front of the automobile  91  and can display the image that is image-captured by the camera  92 . The driver can check the image that is image-captured by the camera  92  and displayed on the display  93  and can thereby check the rear side of the automobile  91 . 
     Second Embodiment 
       FIG. 10  is a cross-sectional view showing a major part of a solid-state image sensing device according to a second embodiment. 
     As shown in  FIG. 10 , a solid-state image sensing device  31  according to the second embodiment includes a substrate  35 , color filters  36  and  37  (two color filters), the photodiodes  38  and  39  serving as a photoelectric converter, and the green-light photoelectric converter  3 . The solid-state image sensing device  31  according to the embodiment is common to the solid-state image sensing device  1  according to the first embodiment in that both the solid-state image sensing devices include the green-light photoelectric converter  3 . The solid-state image sensing device  31  has the structure that is different from that of the solid-state image sensing device  1  in that the solid-state image sensing device  31  includes the color filters  36  and  37  and the photodiodes  38  and  39 . Therefore, identical reference numerals are used for the elements which are common to those of the solid-state image sensing device  1  according to the first embodiment, and explanations thereof are omitted here. 
     The substrate  35  includes the semiconductor substrate  23 , the photodiodes  38  and  39  serving as a photoelectric converter, and the SD  25 . 
     The photodiode  38  is provided inside the semiconductor substrate  23  that is located under the color filter  36 . The photodiode  38  is configured to include: a first impurity region (not shown in the figure) that is exposed at the top surface of the semiconductor substrate  23 ; and a second impurity diffusion region (not shown in the figure) connected to the upper of the first impurity diffusion region. 
     As the first impurity diffusion region, for example, a high concentration P-type impurity diffusion region can be used. In this case, as the second impurity diffusion region, a high concentration N-type impurity diffusion region can be used. 
     The photodiode  38  is disposed so as to face the color filter  36  so that an insulating layer  33  provided on the semiconductor substrate  23  is sandwiched between the photodiode  38  and the color filter  36 . For example, in the case where the color filter  36  is a filter that allows red light to be transmitted therethrough, when the photodiode  38  receives red light, the photodiode photoelectrically converts the red light into power, and generates an electrical charge corresponding to the red light. 
     The photodiode  39  is provided inside the semiconductor substrate  23  that is located under the color filter  37 . The photodiode  39  has the same configuration as that of the aforementioned photodiode  38 . 
     The photodiode  39  is disposed so as to face the color filter  37  so that the insulating layer  33  provided on the semiconductor substrate  23  is sandwiched between the photodiode  39  and the color filter  37 . For example, in the case where the color filter  37  is a filter that allows blue light to be transmitted therethrough, when the photodiode  39  receives blue light, the photodiode photoelectrically converts the blue light into power, and generates an electrical charge corresponding to the blue light. 
     Insulating layers  32  and  33  are insulating films provided between the substrate and the green-light photoelectric converter  3 . As long as the insulating films are made of a material having optical transparency, it is not particularly limited to this. 
     In the insulating layer  32 , the color filters  36  and  37  are provided near the insulating layer  33 . The color filters  36  and  37  allows light, which has a color (i.e., red or blue) different from green that is to be photoelectrically converted by the green-light organic photoelectric conversion layer  16 , to be transmitted therethrough. For example, a color filter that allows red light to be transmitted therethrough can be used as the color filter  36 , and a color filter that allows blue light to be transmitted therethrough can be used as the color filter  37 . 
     Next, an action of the solid-state image sensing device  31  according to the embodiment will be described. 
     Regarding light incident to the solid-state image sensing device  31  according to the embodiment, the green-light photoelectric converter  3  absorbs green light and allows blue light and red light to be transmitted therethrough. Subsequently, the green-light organic photoelectric conversion layer  16  absorbs the green light and photoelectrically converts the light into power, and an electrical charge is generated therefrom in the green-light photoelectric converter  3 . At this time, the amount of the generated electrical charge varies depending on the intensity of the light incident to the organic photoelectric conversion layer. The generated electrical charge is accumulated in the SD  25 . 
     Next, regarding the light that is passed through the green-light organic photoelectric conversion layer  16 , red light passes through the color filter  36 . Furthermore, when the photodiode  38  receives the transmitted red light, the photodiode photoelectrically converts the red light into power and generates an electrical charge corresponding to the red light. 
     Next, regarding the light that is passed through the green-light organic photoelectric conversion layer  16 , blue light passes through the color filter  37 . Furthermore, when the photodiode  39  receives the transmitted blue light, the photodiode photoelectrically converts the blue light into power and generates an electrical charge corresponding to the blue light. 
     After that, an electrical charge that is accumulated in the SD  25  and the photodiodes  38  and  39  serving as a photoelectric conversion device is transmitted to floating diffusion (not shown in the figure). The electrical charge that is transmitted to the floating diffusion is converted into an electrical signal, and is transmitted to a peripheral circuit (not shown in the figure) through a multi-layer interconnection or the like. As stated above, the pixels of the solid-state image sensing device  31  according to the embodiment can independently detect lights having wavelength-bands of three kinds of colors. 
     In the solid-state image sensing device  31  according to the second embodiment, since the green-light organic photoelectric conversion layer  16  is configured to include the second organic dye  18  which is similar to that of the solid-state image sensing device  1  according to the first embodiment, the green-light organic photoelectric conversion layer absorbs the green light and photoelectrically converts the light into power, the exciton gives the excitation energy thereof to the second organic dye  18  before the exciton emits red light, the exciton is inactivated, and emission of red light does not occur. 
     Particularly, in the solid-state image sensing device  31  according to the embodiment, the red light emitted from the green-light organic photoelectric conversion layer  16  does not reach the photodiode  38  (serving as a photoelectric conversion device corresponding to red light), and an erroneous signal also does not occur. As a result, it is possible to improve the color separation characteristics while reducing color mixture. 
     Here, as described above, the wavelength of the red light is longest and the wavelength of the blue light is shortest in the green light, the red light. Additionally, the wavelength of the green light is located between the wavelength of the red light and the wavelength of the blue light. 
     For this reason, in the solid-state image sensing device  31  according to the second embodiment, as a result of: providing, near the light incident side (the portion to which light is to be incident), the green-light photoelectric converter  3  including the green-light organic photoelectric conversion layer  16 ; and providing, under the green-light photoelectric converter, the color filters  36  and  37  that allow the red light and blue light to be transmitted therethrough, respectively, it is possible to carry out color separation of the red light from the blue light with a high level of accuracy. 
     The configuration of the solid-state image sensing device  31  according to the embodiment is an example, and it is not limited to this. 
     In the second embodiment, in the case is described where the green-light organic photoelectric conversion layer  16  including the second organic dye  18  is used as an organic photoelectric conversion layer that is provide near the light incident side, a configuration in which the blue-light organic photoelectric conversion layer  11  including the first organic dye  13  is used therefor may be adopted. In this case, the color filter  37  is replaced with a filter that allows green light to be transmitted therethrough. According to the foregoing configuration, it is possible to prevent occurrence of color mixture due to green light. 
     The configuration in which one kind of or three kinds of photoelectric converters including an organic photoelectric conversion layer are stacked in layers is adopted in the above-described embodiments. However, a configuration in which two kinds of photoelectric converters are stacked in layers may be adopted. That is, in this case, two or more photoelectric converters, each of which includes an organic photoelectric conversion layer, are provided in the solid-state image sensing device; the organic photoelectric conversion layers of the photoelectric converters selectively absorb lights which are selected from three primary colors of light consisting of blue light, green light, and red light and are different from each other; and it is only necessary that one or more organic photoelectric conversion layers include an organic dye. 
     According to at least one of the above-described embodiments, the solid-state image sensing device is configured to include at least one organic photoelectric conversion layer including the organic dye that receives the excitation energy of an exciton before the exciton emits light and causes the exciton to be inactivated. Specifically, since the green-light organic photoelectric conversion layer  16  is configured to include the green-light organic semiconductor material  17  and the second organic dye  18 , the green-light organic semiconductor material  17  absorbs green light and photoelectrically converts the green light into power. Moreover, in the green-light organic photoelectric conversion layer  16 , since the exciton gives the excitation energy thereof to the second organic dye  18  before the exciton emits red light and the exciton is inactivated, emission of red light does not occur. Consequently, the red light due to light emission from the green-light organic photoelectric conversion layer  16  does not reach a red-light photoelectric conversion device that is located near the green-light organic photoelectric conversion layer, and an erroneous signal does not occur. Because of this, it is possible to improve the color separation characteristics while reducing color mixture due to red light. 
     Moreover, in the configuration using the blue-light organic photoelectric conversion layer  11  including the first organic dye  13  instead of the green-light organic photoelectric conversion layer  16 , it is possible to improve the color separation characteristics while reducing color mixture due to green light. 
     Examples 
     Hereinafter, Example 1 will be described. 
     The organic photoelectric conversion film of Example 1 has the same configuration as that of the green-light organic photoelectric conversion layer  16  according to the first and second embodiments. 
     The organic photoelectric conversion film of Example 1 was produced under the following conditions. 
     A solution was prepared by adding, to a chlorobenzene solution containing polyvinyl carbazole used as a host material and rhodamine 6G used as a green-light organic semiconductor material, a small amount of 2,4-bis(4-(diethylamino)-2-hydroxyphenyl) squaraine used as an organic dye which absorbs the energy corresponding to that of red light. Next, the above-mentioned prepared solution was applied on a quartz substrate by spin coating, and the organic photoelectric conversion film of Example 1 was formed. 
     Hereinafter, Comparative Example 1 will be described. 
     The organic photoelectric conversion film of Comparative Example 1 is different from the organic photoelectric conversion film of Example 1 in that Comparative Example 1 does not include the organic dye (2,4-bis(4-(diethylamino)-2-hydroxyphenyl) squaraine) which absorbs the energy corresponding to that of red light. The other compositions of the organic photoelectric conversion film of Comparative Example 1 were the same as those of Example 1. 
     The organic photoelectric conversion film of Comparative Example 1 was produced under the following conditions. 
     A chlorobenzene solution containing polyvinyl carbazole used as a host material and rhodamine 6G used as a green-light organic semiconductor material was prepared. Next, the above-mentioned prepared chlorobenzene solution was applied on a quartz substrate by spin coating, and the organic photoelectric conversion film of Comparative Example 1 was formed. 
     After that, regarding the organic photoelectric conversion films of Example 1 and Comparative Example 1 which were formed on the aforementioned respective quartz substrates, the respective transmission spectrums thereof and the respective emission spectrums thereof were measured, comparison and evaluation thereof was carried out. 
     As a result of comparing the transmission spectrums of the organic photoelectric conversion films (including quartz substrate) of Example 1 and Comparative Example 1, the both transmittance ratios of red light (650 nm) to the transmittance of green light (540 nm) were 1.3. 
     Consequently, it can be determined that reduction in transmittance hardly occurs as a result of adding the organic dye that absorbs the energy corresponding to that of red light to the green-light organic photoelectric conversion film. 
     In contrast, as a result of comparing the emission spectrums of the organic photoelectric conversion films (including quartz substrate) of Example 1 and Comparative Example 1, the emission intensity of Example 1 at a wavelength of near 610 nm due to rhodamine 6G was substantially reduced by a half as compared with that of Comparative Example 1. 
     Therefore, it can be determined that the emission intensity of red light can be reduced by a substantially half as a result of adding the organic dye that absorbs the energy corresponding to that of red light to the green-light organic photoelectric conversion film. 
     From above-mentioned comparison and evaluation of Example 1 and Comparative Example 1, it can be determined that, as a result of adding the organic dye that absorbs the energy corresponding to that of red light to the green-light organic photoelectric conversion film, the emission of light from the green-light organic semiconductor material can be reduced (i.e., color mixture can be prevented) almost without modifying the transmittance characteristics of the green-light organic photoelectric conversion film. 
     While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.