Image sensors and electronic devices
An image sensor includes a color filter array, a first photoelectric conversion device configured to absorb first light passing through the color filter array and convert the absorbed first light into electrical signals, and a second photoelectric conversion device configured to absorb second light passing through both the color filter array and the first photoelectric conversion device and convert the absorbed second light into electrical signals. The first photoelectric conversion device includes a first photoelectric conversion layer configured to selectively absorb a mixed light of the first and second colors. The second photoelectric conversion device comprises a second photoelectric conversion layer configured to absorb light including a third color. Each of the first to third colors is one of three primary colors. The image sensor combines the electrical signals converted from the first and second photoelectric conversion devices to obtain electrical signals of the first to third colors.
1. An image sensor, comprising:
a color filter array;
a first photoelectric conversion device configured to absorb first light that is a portion of light passing through the color filter array and convert the absorbed first light into first electrical signals; and
a second photoelectric conversion device configured to absorb second light that is at least a portion of light passing through both the color filter array and the first photoelectric conversion device and convert the absorbed second light into second electrical signals,
wherein the first photoelectric conversion device includes
a first electrode and a second electrode facing each other, and
a first photoelectric conversion layer between the first electrode and the second electrode, the first photoelectric conversion layer configured to selectively absorb a first mixed light of a first color and a second color,
wherein the second photoelectric conversion device includes
a third electrode and a fourth electrode facing each other, and
a second photoelectric conversion layer between the third electrode and the fourth electrode, the second photoelectric conversion layer configured to absorb light including a third color,
wherein each color of the first color, the second color, and the third color is one of three primary colors,
wherein the first color, the second color, and the third color are different from each other, and
wherein the image sensor is configured to combine the first electrical signals converted from the first photoelectric conversion device and the second electrical signals converted from the second photoelectric conversion device to obtain electrical signals of the first color, the second color, and the third color.
2. The image sensor of claim 1 , further comprising:
a substrate supporting the first photoelectric conversion device and the second photoelectric conversion device,
wherein the substrate does not comprise any silicon-based photodiodes.
3. The image sensor of claim 2 , wherein the first photoelectric conversion layer is on an entire surface of the substrate.
4. The image sensor of claim 1 , wherein
the color filter array comprises a first color filter and a second color filter that are each a different one of a cyan filter, a yellow filter, or a magenta filter, and
the first color filter and the second color filter are configured to selectively transmit second mixed light and third mixed light, respectively, wherein both the second mixed light and the third mixed light include the third color.
5. The image sensor of claim 4 , wherein the first color filter and the second color filter are alternately arranged along rows and columns.
6. The image sensor of claim 1 , wherein
the first photoelectric conversion layer comprises a first light absorbing material configured to selectively absorb light of the first color and a second light absorbing material configured to selectively absorb light of the second color, or
the first photoelectric conversion layer comprises a light absorbing material configured to selectively absorb the first mixed light of the first color and the second color.
7. The image sensor of claim 6 , wherein the first light absorbing material configured to selectively absorb light of the first color and the second light absorbing material configured to selectively absorb light of the second color are mixed or stacked in the first photoelectric conversion layer.
8. The image sensor of claim 1 , wherein the second photoelectric conversion layer comprises:
a light absorbing material configured to selectively absorb the light including the third color;
a light absorbing material configured to selectively absorb a second mixed light of the third color and the first color;
a light absorbing material configured to selectively absorb a third mixed light of the third color and the second color;
a light absorbing material configured to selectively absorb a fourth mixed light of the first color, the second color, and the third color; or
any combination thereof.
9. The image sensor of claim 1 , further comprising a third color filter between the first photoelectric conversion device and the second photoelectric conversion device, the third color filter being configured to selectively transmit the light of the third color.
10. The image sensor of claim 1 , wherein
the color filter array comprises a cyan filter and a yellow filter,
the first color is blue,
the second color is red, and
the third color is green.
11. The image sensor of claim 10 , further comprising a green filter between the first photoelectric conversion device and the second photoelectric conversion device.
12. The image sensor of claim 1 , wherein
the color filter array comprises a magenta filter and a cyan filter,
the first color is red,
the second color is green, and
the third color is blue.
13. The image sensor of claim 12 , further comprising a blue filter between the first photoelectric conversion device and the second photoelectric conversion device.
14. The image sensor of claim 1 , wherein
the color filter array comprises a yellow filter and a magenta filter,
the first color is green,
the second color is blue, and
the third color is red.
15. The image sensor of claim 14 , further comprising a red filter between the first photoelectric conversion device and the second photoelectric conversion device.
16. The image sensor of claim 1 , further comprising a third photoelectric conversion device configured to absorb third light that is light of at least a portion of an infrared wavelength spectrum and to convert the absorbed third light into a third electrical signal.
17. An electronic device comprising the image sensor of claim 1 .