Patent ID: 7638805

Claim:
A microprocessor comprising an integrated circuit including an N-channel transistor and a P-channel transistor, at least one of the N-channel transistor and the P-channel transistor comprising: a supporting substrate comprising single crystalline silicon: an insulating layer comprising silicon oxide at a surface of the supporting substrate; a single crystalline semiconductor layer comprising silicon on a surface of the insulating layer, the single crystalline semiconductor layer having at least a channel formation region and source and drain regions; a gate insulating film formed on the single crystalline semiconductor layer; a gate electrode formed over the channel formation region with the gate insulating film interposed therebetween wherein the gate electrode includes a metal layer which contacts the gate insulating film; silicon oxide films formed on side surfaces of the gate electrode; side walls formed adjacent to the side surfaces of the gate electrode with the silicon oxide films interposed therebetween; and an insulating film comprising silicon nitride formed over the single crystalline semiconductor layer and the gate electrode, wherein the single crystalline semiconductor layer comprises part of a single crystalline silicon substrate different from the supporting substrate.