Patent ID: 7226803
Filing Date: 2007-06-05
Classification: H01L

Abstract:
1. A method of forming a photodiode, said method comprising: forming at least one shallow trench isolation region in a silicon substrate of a first conductivity type; forming a transistor gate over said silicon substrate and spaced apart from said at least one shallow trench isolation region; forming an implanted well region of said first conductivity type located below at least a portion of said transistor gate and extending to only one side of said transistor gate; forming an ultra-shallow first doped layer of said first conductivity type below a surface of said silicon substrate and laterally displaced from said implanted well region on an opposite side of said transistor gate from said implanted well region, said ultra-shallow first doped layer having a dopant concentration within the range of from about 5×10 forming a doped region of a second conductivity type in said silicon substrate and below and in contact with said ultra-shallow first doped layer.