Patent ID: 7928486

Claim:
A CMOS type photoelectric conversion device formed on a semiconductor substrate of a first conductivity type, the CMOS type photoelectric conversion device comprising: a photoelectric conversion element having a charge accumulation region of the first conduction type and a plurality of impurity regions of a second conduction type; a transfer MOS transistor for transferring a charge generated in the photoelectric conversion element; an impurity region of the first conductivity type to which the charge is transferred by the transfer MOS transistor, wherein the plurality of impurity regions of the second conduction type are arranged under the charge accumulation region, extend under a gate electrode of the transfer MOS transistor, and include at least a first impurity region, a second impurity region arranged between the first impurity region and the charge accumulation region, and a third impurity region arranged between the second impurity region and the charge accumulation region, and wherein a concentration C 1 corresponding to a peak of an impurity concentration in the first impurity region, a concentration C 2 corresponding to a peak of an impurity concentration in the second impurity region, and a concentration C 3 corresponding to a peak of an impurity concentration in the third impurity region satisfy a relationship of: C 2 <C 3 <C 1 ; and a channel doped region of the second conductivity type arranged at an upper portion of the third impurity region and at a lower portion of the gate electrode of the transfer MOS transistor.