Patent ID: 8110465
Filing Date: 2012-02-07
Classification: H01L

Abstract:
1. A semiconductor structure comprising: a body comprising a semiconductor material, having a doping of a first conductivity type, and located in a semiconductor substrate; a source region having a doping of a second conductivity type, abutting said body, and located in said semiconductor substrate, wherein said second conductivity type is the opposite of said first conductivity type; a drain region having a doping of said second conductivity type, abutting said body, disjoined from said source region, and located in said semiconductor substrate; a source side gate electrode containing a first gate dielectric portion and a first gate conductor, wherein said first gate dielectric portion vertically abuts said body, and wherein said first gate conductor abuts said first gate dielectric; and a drain side gate electrode abutting said source side gate electrode and containing a second gate dielectric portion and a second gate conductor, wherein said second gate dielectric portion vertically abuts said body, and wherein a sidewall of said first gate conductor directly and physically contacts a sidewall of said second gate conductor and a topmost surface of said source side gate electrode is vertically offset from a topmost surface of said drain side gate electrode; wherein said first gate conductor comprises a stack of a metal gate layer and a semiconductor gate layer, wherein the metal gate layer is physically contacted to the semiconductor gate layer.