Patent ID: 7560674

Claim:
A CMOS image sensor, comprising: a first, second, and third photo diodes doped with an N type dopant and a plurality of transistors spaced at a predetermined distance in a semiconductor substrate; a diffusion blocking layer on a surface of the substrate, wherein the diffusion blocking layer has an opening selectively exposing at least one of the photo diodes; an interlevel dielectric layer comprising a P-type dopant formed over the entire surface of the substrate, covering the diffusion blocking layer and directly connecting to the at least one of the photo diodes via the opening in the diffusion blocking layer; red, blue, and green filter layers over the interlevel dielectric layer, respectively corresponding to the first, second and third photo diodes, wherein the opening in the diffusion blocking layer corresponds to at least one of the blue and green color filter layers; a plurality of microlenses over the color filter layers, corresponding to each color filter layer; and a P+ diffusion region formed on a surface of at least one of the photo diodes via the opening in the diffusion blocking layer.