Patent ID: 6967121
Filing Date: 2005-11-22
Classification: H01L

Abstract:
1. A method of forming an imaging device, comprising the steps of: providing a semiconductor substrate having a doped layer of a first conductivity type; forming a first doped region of a second conductivity type in the doped layer; forming a second doped region of said second conductivity type in the doped layer spaced from said first doped region; forming a third doped region of said second conductivity type in the doped layer spaced from said second doped region; forming a buried doped region of said second conductivity type in said doped layer adjacent said first and second doped regions and adjacent said second and third doped regions, wherein said buried doped region is doped at a dopant concentration less than said first, second and third doped regions; forming a photogate over said buried doped region adjacent said first doped region; forming a transfer gate over said buried doped region between said second and said third doped regions; forming a contact between said second doped region and a source follower transistor wherein the gate of said source follower transistor is formed over said buried doped region.