Patent ID: 8816405
Filing Date: 2014-08-26
Classification: H01L

Abstract:
1. A method of forming a photosensor in an integrated circuit comprising the steps of: providing a semiconductor substrate having a first doped region of a first conductivity type; providing a raised photosensitive region formed completely above a top surface of the semiconductor substrate by: forming at least one interlevel dielectric over the semiconductor substrate; forming at least one trench in an upper surface of the at least one interlevel dielectric; forming a metal material contoured to the at least one trench; forming a second doped region of a second conductivity type above the metal material wherein the second doped region is contoured to the at least one trench; and electrically connecting the second doped region to the first doped region, wherein the metal material and the second doped region are formed such that light which passes through the second doped region is redirected by the metal material back to the second doped region.