Patent ID: 7416968

Claim:
A method of forming a field effect transistor, comprising the steps of: forming a conductive gate electrode comprising silicon on a semiconductor substrate; depositing an insulating layer on the conductive gate electrode and on the sidewall spacers; planarizing the insulating layer for a sufficient duration to expose the conductive gate electrode; forming a first metal layer on the conductive gate electrode; thermally treating the first metal layer and the conductive gate electrode for a sufficient duration to convert a first portion of the conductive gate electrode into a first metal silicide region; removing first metal layer and the first metal silicide region to thereby expose a second portion of the conductive gate electrode; forming a second metal layer on the second portion of the conductive gate electrode; and thermally treating the second metal layer and the second portion of the conductive gate electrode for a sufficient duration to thereby convert the second portion of the conductive gate electrode into a second metal silicide region.