Patent ID: 11968848
Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An image sensor comprising:
a first light sensor layer comprising a first light sensing cell configured to sense first light of an incident light and generate a first electrical signal based on the sensed first light;
a color filter array layer disposed on the first light sensor layer, and comprising a first color filter facing the first light sensing cell;
a second light sensor layer disposed on the color filter array layer, and configured to sense second light of the incident light and generate a second electrical signal based on the sensed second light;
a wiring layer surrounding the first light sensing cell; and
a through-channel passing through the wiring layer, and electrical connected to the second light sensor layer,
wherein the first color filter comprises:
a nanostructure comprising a plurality of structures made of a first material having a first refractive index, and a second material having a second refractive index different from the first refractive index, each of the plurality of structures arranged in a direction parallel to an upper surface of the first color filter,
a first substrate disposed on the first light sensor layer and made of a material having a third refractive index lower than the first refractive index, the plurality of structures being disposed on the first substrate, and
a second substrate disposed between the plurality of structures and the second light sensor layer and made of a material having a fourth refractive index lower than the first refractive index,
wherein the plurality of structures comprise a plurality of through-holes formed between the first substrate and the second substrate and filled with the second material, the second refractive index of the second material being lower than the first refractive index of the first material.