Patent ID: 7898000

Claim:
A solid-state image pickup device in which a plurality of pixels including a photoelectric conversion part having a charge accumulation region is two-dimensionally arrayed in a well region provided in a semiconductor substrate, the solid-state image pickup device comprising: an element isolation insulating film that electrically isolates the pixels on the surface of the well region; a first isolation diffusion region that electrically isolates the pixels; and a second isolation diffusion region that than electrically isolates the pixels which is located under the first isolation diffusion region, and wherein a width of said second isolation diffusion region is smaller than that of said first isolation diffusion region and a part of the charge accumulation region corresponding to the boundary between the charge accumulation region and the second isolation diffusion layer is disposed under the first isolation diffusion region, and further wherein a portion of the charge accumulation region is mixed with the first isolation diffusion region.