Patent ID: 7202151

Claim:
A method for fabricating a silicon on insulator semiconductor device, comprising: preparing a substrate; forming an insulating film on the substrate; forming a silicon layer on the insulating film; heating the substrate to a predetermined temperature; forming a metallic layer on the silicon layer of the heated substrate by a straight sputtering method so as to sputter straightly to the silicon layer, wherein the metallic layer has a first thickness; forming a protective layer on the metallic layer, wherein the protective layer protects the metallic layer from a surrounding atmosphere and wherein the protective layer has a second thickness greater than the first thickness; forming a metallic suicide layer in an interface between the silicon layer and the metallic layer under the protective layer by a first heat treatment, so that the metallic silicide layer has a high resistance crystalline structure; removing the protective layer; and subjecting the metallic silicide layer to a second heat treatment after said removing the protective layer, so that the metallic silicide layer has a low resistance crystalline structure, a sheet resistance of about 10 Ω/sq and a thickness of about 30 nm.