Patent ID: 6794252
Filing Date: 2004-09-21
Classification: H01L

Abstract:
A method for forming dual work function gate electrodes in a semiconductor device formed on a substrate, comprising:providing a dielectric layer outwardly of the substrate; forming a metal layer outwardly of the dielectric layer; forming a silicon-germanium layer outwardly of the metal layer; removing a first portion of the silicon-germanium layer to expose a first portion of the metal layer, with a second portion of the silicon-germanium layer remaining over a second portion of the metal layer; forming by an anneal process a silicon-germanium metal compound layer from the second portion of the silicon-germanium layer and the second portion of the metal layer; forming a first gate electrode having a first work function, the first gate electrode comprising the first portion of the metal layer; and forming a second gate electrode having a second work function, the second gate electrode comprising the silicon-germanium metal compound layer.