Patent ID: 8648944

Claim:
A solid-state image sensor, comprising: a semiconductor substrate; first and second pixels formed on the semiconductor substrate, each of the first and second pixels including a photoelectric conversion element having a charge accumulation region of a first conductivity type, a floating diffusion region of the first conductivity type, and a transfer transistor which transfers charge accumulated in the charge accumulation region to the floating diffusion region; an insulator made of dielectric material and arranged at a position between the floating diffusion region of the first pixel and the charge accumulation region of the second pixel; and an impurity diffusion region of a second conductivity type arranged at a position inside the semiconductor substrate and below the floating diffusion region of the first pixel and a part of the insulator, wherein an impurity concentration profile, along a direction parallel to a surface of the semiconductor substrate, of the impurity diffusion region has a peak at a position below the floating diffusion region of the first pixel.