Patent ID: 7408210

Claim:
A solid state image pickup device including a plurality of pixels, the device comprising: a photoelectric conversion region for accumulating carriers generated by incident light; a first transfer switch for transferring the carriers accumulated in the photoelectric conversion region; a floating diffusion region for making the carriers accumulated in the photoelectric conversion region flow therein through the first transfer switch; a carrier accumulating region for accumulating at least a part of carriers overflowed from the photoelectric conversion region; and a second transfer switch for transferring the carriers accumulated in the carrier accumulating region to the floating diffusion region; wherein the carrier accumulating region includes: one part of a semiconductor region of a first conductivity type, a first dielectric film formed on the one part of the semiconductor region, a first electrode layer formed on the first dielectric film, a second dielectric film formed on the first electrode layer, a second electrode layer formed on the second dielectric film, a first impurity-diffused layer which is formed in the semiconductor region so as to be vertically adjacent to the first dielectric film and contains impurities of a second conductivity type opposite to the first conductivity type, and a second impurity-diffused layer which is formed in the semiconductor region so as to be horizontally adjacent to the first impurity-diffused layer, and contains the impurities of the second conductivity type.