Patent ID: 7323731

Claim:
A photoelectric conversion device formed in a semiconductor substrate of a first conduction type, which is the same conductor type as a signal carrier comprising: a photoelectric conversion element having an impurity region of the first conduction type, and a plurality of impurity regions of a second conduction type opposite to the conduction type of the signal carrier, and an element separation member, wherein said plurality of second conduction type impurity regions forms a photodiode with the impurity region of the first conduction type and includes at least a first impurity region, a second impurity region provided between said first impurity region and a surface of said substrate, and a third impurity region provided between said second impurity region and the surface of said substrate, and the first, second, and third impurity regions are disposed under the impurity region of the first conduction type, and each of the plurality of impurity regions have a peak of impurity concentration in a depth direction, and wherein a concentration C 1 corresponding to a peak of the impurity concentration in said first impurity region, a concentration C 2 corresponding to a peak of the impurity concentration in said second impurity region, and a concentration C 3 corresponding to a peak of the impurity concentration in said third impurity region, satisfy the following relationship: C2<C3<C1.