Patent ID: 7755122

Claim:
A complementary metal-oxide semiconductor (CMOS) image sensor, comprising: a light-receiving element, disposed in a light sensing region of a substrate; at least one transistor, disposed inside a transistor region of the substrate, and the transistor and the light-receiving element are electrically coupled; a first dielectric layer, disposed on the substrate covering the transistor and the light-receiving element; a conductive reflective layer, disposed on the first dielectric layer inside the light sensing region and comprising copper or aluminum; a second dielectric layer, disposed on the first dielectric layer outside of the conductive reflective layer; a protective layer, disposed on the second dielectric layer; a material layer, disposed inside of the conductive reflective layer on the first dielectric layer; a transparent material layer, disposed above the material layer, the protective layer, and the conductive reflective layer; an optical filter, disposed on the transparent material layer; a converging element, disposed on the optical filter inside the light sensing region; and a metal interconnect line, disposed in the first dielectric layer and the second dielectric layer within the transistor region and electrically coupled to the transistor, wherein a material of the conductive reflective layer and a material of the metal interconnect line are the same.