Patent ID: 7329557

Claim:
A method of manufacturing a solid-state imaging device that comprises a plurality of pixels, each pixel having: a N-type photodiode region that is formed inside a P-type well of a Si substrate in order to photoelectrically convert incident light; a gate electrode having one edge portion positioned so as to overlap the photodiode region; a N-type drain region positioned adjacent to the other edge of the gate electrode; an element-isolating portion having a shallow trench isolation structure for isolating the respective photodiode regions of the pixels from the photodiode region of an adjacent pixel; and a gate oxide film having a thickness of not more than 10 nm, the method comprising: forming the photodiode region; forming a first region, a second region and a third region on a surface portion extending from the upper portion of the photodiode region to the drain region in each of the pixels; and forming the gate electrode so that the one edge portion overlaps the photodiode region, wherein the first region is disposed at a predetermined distance from one edge of the gate electrode and has a P-type first concentration C 1 , the second region is disposed with one edge positioned adjacent to the first region and the other edge overlapping the gate electrode in a certain region and has a P-type second concentration C 2 , in which a predetermined part of the second region does not overlap the photodiode region and a whole part of the P-type well under the predetermined part of the second region is of a P-type, the third region is disposed with one edge positioned adjacent to the second region and the other edge positioned adjacent to the drain region and has a P-type third concentration C 3 , with the respective concentrations being in a relationship of C 1 >C 2 >C 3 or C 1 ≈C 2 >C 3 , and the respective concentrations are adjusted by controlling a dose of ion implantation for forming the P-type diffusion layers.