Patent ID: 8440490

Claim:
A method for manufacturing a pixel sensor cell including a photosensitive element having a non-laterally disposed charge collection region, said method comprising: forming a trench recess in a substrate of a first conductivity type material, said trench having sidewall and bottom portions; filling said trench recess with a material having second conductivity type material; outdiffusing said second conductivity type material out of said filled trench material to the substrate region surrounding the trench sidewalls and bottom to form said non-laterally disposed charge collection region; removing said filled trench material to provide said trench recess; filling said trench recess with a material having a first conductivity type material; forming a surface implant layer having first conductivity type material, said surface implant layer formed at either side of said trench, wherein said non-laterally disposed charge collection region of said photosensitive element is isolated from the substrate surface.