Patent ID: 6835637
Filing Date: 2004-12-28
Classification: H01L

Abstract:
A method of forming a multi-layered gate for use in an imaging device, comprising the steps of:providing a semiconductor substrate having a photosensitive region of a first conductivity type; forming a first insulating layer on the semiconductor substrate and over the photosensitive region; forming a first conductive layer over the first insulating layer; forming a second insulating layer over the first conductive layer; patterning at least the first conductive layer to form a first gate; forming a third insulating layer over the semiconductor substrate; forming a second conductive layer over the third insulating layer and at least a portion of the first conductive layer; forming a second gate from the second conductive layer and the third insulating layer; and forming a floating diffusion region of a second conductivity type in the substrate adjacent the first gate on a side of the first gate opposite the second gate.