Patent ID: 7148528
Filing Date: 2006-12-12
Classification: H01L

Abstract:
1. A photoconversion device comprising: a substrate having a surface; a doped region in said substrate and at said surface thereof, said doped region being of a first conductivity type and having a graded profile, wherein said doped region has a higher dopant concentration near the surface of the substrate, comprises a first sub-region doped to a first dopant concentration and a second sub-region doped to a second dopant concentration and a third sub-region adjacent to said first and second doped sub-regions, wherein said third sub-region is doped the same as said substrate; and a charge accumulation region in said substrate and substantially below said doped region, said charge accumulation region being of a second conductivity type, said third sub-region separating said first and second doped sub-regions from said charge accumulation region and a transistor gate.