Patent ID: 7790570

Claim:
A method of manufacturing a semiconductor device, said method comprising the steps of: forming a first silicon oxide film on a first substrate comprising single crystal semiconductor including silicon; forming a second silicon oxide film on a second substrate; forming a hydrogen added layer in the first substrate; bonding the first substrate to the second substrate with the first silicon oxide film and the second silicon oxide film disposed between the first substrate and the second substrate; separating the first substrate by a heat treatment so as to form a single crystal semiconductor layer comprising silicon over the second substrate with the first silicon oxide film and the second silicon oxide film interposed therebetween; forming a gate insulating film on the single crystal semiconductor layer; forming a gate electrode comprising silicon on the gate insulating film; forming side walls adjacent to side surfaces of the gate electrode wherein the single crystal semiconductor layer extends beyond outer side edges of the side walls; forming a metal film on upper surfaces of the single crystal semiconductor layer and an upper surface of the gate electrode; heating the metal film so that at least upper portions of the single crystal semiconductor layer and an upper portion of the gate electrode react with the metal film to form metal silicide layers; and forming an interlayer insulating film comprising silicon nitride over the single crystal semiconductor layer and the gate electrode.