Patent ID: 8652864

Claim:
A method for producing a solid-state image pickup device in which a plurality of pixels each including a photoelectric conversion part having a charge accumulation region are two-dimensionally arrayed in a well region of a semiconductor substrate, the method comprising the steps of: forming a first isolation diffusion region between the pixels and in the well region, the first isolation diffusion region electrically isolating the pixels, the first isolation diffusion region having a projecting region in which the inner peripheral part of the first isolation diffusion region corresponding to the boundary with the charge accumulation region projects in into the charge accumulation region; forming a second isolation diffusion region between the pixels in the well region under the first isolation diffusion region, the second isolation diffusion region also electrically isolating the pixels under the first isolation diffusion region; and forming the photoelectric conversion part for each pixel in the well region such that it is between the isolation diffusion regions, the photoelectric conversion parts are electrically isolated from each other at least by, the first isolation diffusion region, and the second isolation diffusion region, wherein the step of forming the photoelectric conversion part includes the steps of: implanting an impurity ion for forming the charge accumulation region in the well region surrounded by the first isolation diffusion region and the second isolation diffusion region but not in the projecting region of the first isolation diffusion region; and thermally diffusing the implanted impurity implanted in the well region so that a part of the charge accumulation region corresponding to the boundary between the charge accumulation region and the second isolation diffusion region is diffused to a region under the projecting region, and the projecting region of the first isolation diffusion region is formed in a state in which an impurity having the conductivity type of the first isolation diffusion region and an impurity having a conductivity type of the charge accumulation region are mixed.