Patent ID: 8785991

Claim:
A solid state imaging device comprising: a p-type well region in direct physical contact with a p + -type semiconductor region and an n + -type floating diffusion portion, a portion of the p-type well region being between said p + -type semiconductor region and said n + -type floating diffusion portion; a p + -type first vertically elongated region in direct physical contact with said p + -type semiconductor region and an n-type vertically elongated region, said n-type vertically elongated region being in direct physical contact with said p-type well region and said p + -type first vertically elongated region; an insulation film in direct physical contact with said p + -type first vertically elongated region and said p + -type semiconductor region, said p-type well region and said n + -type floating diffusion portion being in direct physical contact with said insulation film; a p + -type bottom surface region in direct physical contact with said n-type vertically elongated region and said p + -type first vertically elongated region, said p + -type bottom surface region being configured to transfer incident light to said n-type vertically elongated region, wherein an impurity concentration of an n-type conductivity in the n-type vertically elongated region is substantially the same throughout the entirety of said n-type vertically elongated region, wherein an impurity concentration of a p-type conductivity in the p + -type first vertically elongated region is higher than an impurity concentration of the p-type conductivity in the p-type well region, wherein more of a signal charge is accumulable in a pn junction between said n-type vertically elongated region and said p + -type first vertically elongated region than in a pn junction between said n-type vertically elongated region and said p + -type semiconductor region, and the shape of potential is provided such that charges are mainly accumulated in a vertical direction.