Solid-state imaging device, method of manufacturing solid-state imaging device, and electronic apparatus
View Patent ↗There is provided a solid-state imaging device including: a semiconductor substrate that is formed with a photodiode for each pixel; a light shielding film that is laminated on the semiconductor substrate on a side of a light irradiated surface which is irradiated with light, and is formed to include an opening corresponding to a spot in which at least the photodiode is arranged; and a photoelectric conversion film that is laminated to cover the light irradiated surface of the semiconductor substrate and the light shielding film, and is configured to generate an electrical charge by absorbing light. The photoelectric conversion film is formed of a material which has higher light absorptivity than light absorptivity of the semiconductor substrate.
1. A solid-state imaging device comprising:
a semiconductor substrate that is formed with a photodiode for each pixel;
a light shielding film that is laminated on the semiconductor substrate on a side of a light irradiated surface which is irradiated with light, and is formed to include an opening corresponding to a spot in which at least the photodiode is arranged; and
a photoelectric conversion film that is laminated to cover the light irradiated surface of the semiconductor substrate and the light shielding film, and is configured to generate an electrical charge by absorbing light,
wherein the photoelectric conversion film is formed of a material which has higher light absorptivity than light absorptivity of the semiconductor substrate, and
wherein the light-irradiated surface is a back surface when it is assumed that a surface of the semiconductor substrate, on which a wiring layer is laminated, is a front surface.
2. The solid-state imaging device according to claim 1 ,
wherein a surface of the photoelectric conversion film is planarized.
3. The solid-state imaging device according to claim 1 ,
wherein a negative bias is applied to the light shielding film.
4. The solid-state imaging device according to claim 1 ,
wherein an arrangement location of the light shielding film is adjusted to move on a central side of the solid-state imaging device in the pixel which is arranged in the vicinity of an end section of the solid-state imaging device according to planar arrangement of the pixel.
5. The solid-state imaging device according to claim 1 ,
wherein the light shielding film is formed to cover at least a memory section that temporarily holds the electrical charge transmitted from the photodiode and an electrical charge detection section that converts the electrical charge transmitted from the photodiode into a voltage.
6. The solid-state imaging device according to claim 1 ,
wherein the light shielding film is formed to cover at least a memory section that temporarily holds the electrical charge transmitted from the photodiode.
7. The solid-state imaging device according to claim 1 ,
wherein a high reflection film that has high reflectance of light is formed to cover the light shielding film.
8. The solid-state imaging device according to claim 1 , further comprising:
a color filter layer that is laminated on the photoelectric conversion film and is configured to pass predetermined color light for each pixel,
wherein a thickness of the light shielding film, and a thickness of a film that is formed to cover the light shielding film, and reflectance are differently formed for each pixel according to a color of the color filter layer.
9. A method of manufacturing a solid-state imaging device, the method comprising:
laminating a light shielding film, formed to include an opening corresponding to a spot in which at least a photodiode is arranged, on a light irradiated surface, which is irradiated with light, of a semiconductor substrate that is formed with the photodiode for each pixel; and
laminating a photoelectric conversion film, configured to generate an electrical charge by absorbing light, to cover the light irradiated surface of the semiconductor substrate and the light shielding film,
wherein the photoelectric conversion film is formed of a material which has higher light absorptivity than light absorptivity of the semiconductor substrate, and
wherein the light-irradiated surface is a back surface when it is assumed that a surface of the semiconductor substrate, on which a wiring layer is laminated, is a front surface.
10. An electronic apparatus comprising a solid-state imaging device which includes:
a semiconductor substrate that is formed with a photodiode for each pixel;
a light shielding film that is laminated on the semiconductor substrate on a side of a light irradiated surface which is irradiated with light, and is formed to include an opening corresponding to a spot in which at least the photodiode is arranged; and
a photoelectric conversion film that is laminated to cover the light irradiated surface of the semiconductor substrate and the light shielding film, and is configured to generate an electrical charge by absorbing light,
wherein the photoelectric conversion film is formed of a material which has higher light absorptivity than light absorptivity of the semiconductor substrate, and
wherein the light-irradiated surface is a back surface when it is assumed that a surface of the semiconductor substrate, on which a wiring layer is laminated, is a front surface.
11. The electronic apparatus according to claim 10 ,
wherein a surface of the photoelectric conversion film is planarized.
12. The electronic apparatus according to claim 10 ,
wherein a negative bias is applied to the light shielding film.
13. The electronic apparatus according to claim 10 ,
wherein an arrangement location of the light shielding film is adjusted to move on a central side of the solid-state imaging device in the pixel which is arranged in the vicinity of an end section of the solid-state imaging device according to planar arrangement of the pixel.
14. The electronic apparatus according to claim 10 ,
wherein the light shielding film is formed to cover at least a memory section that temporarily holds the electrical charge transmitted from the photodiode and an electrical charge detection section that converts the electrical charge transmitted from the photodiode into a voltage.
15. The electronic apparatus according to claim 10 ,
wherein the light shielding film is formed to cover at least a memory section that temporarily holds the electrical charge transmitted from the photodiode.
16. The electronic apparatus according to claim 10 ,
wherein a high reflection film that has high reflectance of light is formed to cover the light shielding film.
17. The electronic apparatus according to claim 10 , further comprising:
a color filter layer that is laminated on the photoelectric conversion film and is configured to pass predetermined color light for each pixel,
wherein a thickness of the light shielding film, and a thickness of a film that is formed to cover the light shielding film, and reflectance are differently formed for each pixel according to a color of the color filter layer.