Patent ID: 6548352
Filing Date: 2003-04-15
Classification: H01L

Abstract:
A method of forming a multi-layered gate for use in an imaging device, comprising the steps of:forming a photosensitive region of a first conductivity type on a substrate; forming a first insulating layer over said substrate; forming a first conductive layer over said first insulating layer; forming a second insulating layer over said first conductive layer; forming a first gate by etching unmasked portions of said second insulating layer, and said first conductive layer to expose a surface of said first insulating layer; forming insulating sidewalls on lateral sides of said first gate; after forming said insulating sidewalls, removing exposed portions of said first insulating layer to expose a surface of said substrate; forming a fourth insulating over said exposed surface of said substrate; forming a second gate on said fourth insulating layer and at least one of said insulating sidewalls of said first gate, and such that said second gate overlaps a section of said first gate and is formed on said second insulating layer of said first gate, wherein at least one of said first or said second gate comprises a semi-transparent conductive layer.