Patent ID: 8399946

Claim:
A solid-state imaging device comprising: a semiconductor substrate of a first conductive type; a first diffusion layer of a second conductive type provided on a surface of the semiconductor substrate; a pixel region in the first diffusion layer, the pixel region including a plurality of second diffusion layers of the first conductive type provided in the first diffusion layer, the plurality of the second diffusion layers comprising bottom portions contacting the surface of the semiconductor substrate, and a plurality of photodiodes provided in the first diffusion layer, the plurality of the photodiodes being separated from each other by the plurality of the second diffusion layers; and a first peripheral region in the first diffusion layer, the first peripheral region including a third diffusion layer of the first conductive type provided in the first diffusion layer, the third diffusion layer comprising a bottom portion contacting the surface of the semiconductor substrate, wherein the bottom portion of the third diffusion layer and the bottom portions of the plurality of the second diffusion layers have same concentration gradients.