Patent ID: 7943457
Filing Date: 2011-05-17
Classification: H01L

Abstract:
1. A method of forming a semiconductor device comprising: forming a gate stack including a gate dielectric and a first metal gate conductor atop a first conductivity type region and a second conductivity type region of a substrate; removing a portion of the first metal gate conductor that is present atop the first conductivity type region to expose the gate dielectric present atop the first conductivity type region, wherein a remaining portion of the first metal gate conductor is present atop the second conductivity type region; nitriding the gate dielectric that is present atop the first conductivity type region and the first metal gate conductor that is present atop the second conductivity type region, wherein the nitriding comprises applying a nitrogen based plasma to the gate dielectric and the first metal gate conductor; and forming a second metal gate conductor overlying at least the gate dielectric that is present atop the first conductivity type region.