Patent ID: 7749798

Claim:
A method of forming a region in an image sensor comprising: forming a semiconductor substrate of a first conductivity type having a surface; forming a gate on the surface of the substrate; and forming a photosensor configured as a source of said gate, said step of forming a photosensor including forming an implant region within said substrate of a second conductivity type different than said first conductivity type, wherein a first portion of said implant region is formed by a first step of implanting ions of said second conductivity type at a first implanting angle other than normal to the surface of the substrate such that said first portion extends further towards a region of said substrate beneath said gate than a second portion of said implant region, said second portion being formed underneath the first portion in the implant region, wherein the second portion of said implant region is formed by a second step of implanting ions of said second conductivity type at a second implanting angle other than normal to the surface of the substrate, and wherein said second implanting angle is greater than said first implanting angle.