Patent ID: 7195947

Claim:
A method of forming a p-n-p photodiode for a CMOS imaging device, said method comprising: forming at least one field oxide region in a substrate; forming a transistor gate over said substrate and spaced apart from said at least one field oxide region; forming an n-type doped region in said substrate by implanting n-type ions at an incidence angle with said substrate other than ninety degrees; forming an insulating layer over said transistor gate and said substrate; and forming a p-type doped layer within said substrate and above said n-type doped region, said p-type doped layer being in contact with said field oxide region and being displaced laterally from an electrically active area of said transistor gate by a distance, said p-type doped layer having a dopant concentration within the range of from about 1×10 17 to about 1×10 19 atoms per cm 3 .