Photoelectric conversion device, imaging element, and imaging device

Patent metadata

Field	Value
Publication number	US-10367113-B2
Application number	US-201715647007-A
Country	US
Kind code	B2
Filing date	Jul 11, 2017
Priority date	Jul 15, 2016
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

A device uses a light-emitting material. The device includes an upper and a lower electrode, a first photoelectric conversion portion disposed between the upper electrode and the lower electrode, a second photoelectric conversion portion, a first readout circuit connected to the first photoelectric conversion portion, and a second readout circuit connected to the second photoelectric conversion portion. The second photoelectric conversion portion converts light emitted from the light-emitting material into electrical charges.

First claim

What is claimed is:

1. A device comprising a plurality of photoelectric conversion elements containing a light-emitting material disposed at light incident side of the photoelectric conversion element, the plurality of photoelectric conversion elements, which convert light having color different from each other, comprises:
an upper and a lower electrode;
at least one first photoelectric conversion portion between the upper electrode and the lower electrode, the first photoelectric conversion portion including a photoelectric conversion layer;
at least one second photoelectric conversion portion;
a first readout circuit connected to the first photoelectric conversion portion;
a second readout circuit connected to the second photoelectric conversion portion;
an incoming light-blocking member between the first photoelectric conversion portion and the second photoelectric conversion portion; and
a wavelength limiter disposed closer than the first photoelectric conversion portion to the light-incident side, the wavelength limiter limiting the wavelength of light in a range from a minimum wavelength λ L1 to a maximum wavelength λ L2 ,
wherein the incoming light-blocking member blocks light in a wavelength region from a minimum wavelength λ S1 to a maximum wavelength λ S2 , and the incoming light-blocking member and the wavelength limiter satisfy the following relationship (A):
λ S1 ≤λ L1 ≤λ L2 ≤λ S2   (A), and

wherein the second photoelectric conversion portion converts light emitted from the light-emitting material into electrical charges.

2. The device according to claim 1 , wherein the light-emitting material is contained in a light-emitting member disposed between the first photoelectric conversion portion and the second photoelectric conversion portion.

3. The device according to claim 1 , wherein the light-emitting material is contained in the first photoelectric conversion portion.

4. The device according to claim 1 , wherein the photoelectric conversion layer of the first photoelectric conversion portion comprises an organic compound, and the second photoelectric conversion portion comprises an inorganic compound.

5. The device according to claim 2 , wherein the first photoelectric conversion portion is disposed closer than the second photoelectric conversion portion to the light incident side.

6. The device according to claim 3 , wherein the light-emitting material is present closer than the photoelectric conversion layer to the lower electrode.

7. The device according to claim 1 , wherein a majority of the transition moments in the light-emitting material are parallel to a surface of the second photoelectric conversion portion, the surface being to receive light.

8. The device according to claim 1 , wherein the first photoelectric conversion portion has a higher photoelectric conversion sensitivity than the second photoelectric conversion portion.

9. The device according to claim 1 , wherein the second photoelectric conversion portion has a smaller light-receiving area than the first photoelectric conversion portion has.

10. The device according to claim 1 , wherein the light-emitting material emits light including light rays having a wavelength in a near-infrared region.

11. The device according to claim 1 ,
wherein the light emitting material emits light in a wavelength region up to a maximum wavelength λ P2 and satisfying the relationship (B):
λ L2 ≤λ S2 ≤λ P2   (B), and

wherein the second photoelectric conversion portion has a photoelectric conversion sensitivity to light having a wavelength in the range from λ S2 to λ P2 .

12. The device according to claim 1 , further comprising a light guide between the first photoelectric conversion portion and the second photoelectric conversion portion.

13. The device according to claim 1 , wherein further comprising a light diffusion suppressor between each of the first photoelectric conversion portions.

14. The device according to claim 1 , wherein the first photoelectric conversion portion has a light absorptance of 90% or more.

15. The device according to claim 1 , wherein the at least one first photoelectric conversion portion is defined by a plurality of first photoelectric conversion portions, and the at least one second photoelectric conversion portion is defined by a plurality of second photoelectric conversion portions,
wherein each of the plurality of first photoelectric conversion portions receives light in a different wavelength region from the others, and each of the plurality of second photoelectric conversion portions receives light in a different wavelength region from the others.

16. An imaging element comprising:
the device as set forth in claim 1 ; and
a signal processing circuit connected to the readout circuit of the photoelectric conversion device.

17. An imaging device comprising:
an imaging system including a plurality of lenses; and
an imaging element for receiving light that has passed through the imaging system, the imaging element being the imaging element as set forth in claim 16 .

18. The device according to claim 1 , wherein each of the plurality of photoelectric conversion elements further comprises a color filter.

Assignees

• Canon Kk

Inventors

• Takahashi Tetsuo
• Takahashi Hidekazu
• Yamada Naoki
• Matsuda Yojiro
• Itabashi Masumi
• Miyashita Hirokazu
• Tashiro Kazuaki

Classifications

• H01L31/102

  Electricity · mapped topic

• H01L31/153 Primary

  Electricity · mapped topic

• H01L31/02164

  Electricity · mapped topic

• H01L31/02327

  Electricity · mapped topic

• H01L33/38

  Electricity · mapped topic