Patent ID: 7492048
Filing Date: 2009-02-17
Classification: H01L

Abstract:
1. A semiconductor structure, comprising: (a) a photo diode that includes a first semiconductor region and a second semiconductor region, wherein the first semiconductor region is doped with a first doping polarity, wherein the second semiconductor region is doped with a second doping polarity, and wherein the first and second doping polarities are opposite; (b) a transfer gate that comprises (i) a first extension region, (ii) a second extension region, and (iii) a floating diffusion region, wherein the first extension region is in direct physical contact with the photo diode, and wherein the second extension region is in direct physical contact with the floating diffusion region; and (c) a charge pushing region, wherein the charge pushing region overlaps the first semiconductor region, wherein the charge pushing region does not overlap the floating diffusion region, and wherein the charge pushing region comprises a transparent and electrically conducting material.