Patent ID: 7772111

Claim:
A method of fabricating a semiconductor device, comprising: forming a via-hole in an interlayer insulation film containing a methyl group such that a metal interconnection pattern formed underneath said interlayer insulation film is exposed at a bottom of said via-hole; forming a conductive barrier film on said interlayer insulation film so as to cover a sidewall surface of said via-hole and said exposed metal interconnection pattern in conformity with a shape of said via-hole; and forming a metal film on said conductive barrier film, wherein there is provided a preprocessing step, after said forming said via-hole but before said forming said conductive barrier film, processing said interlayer insulation film including said sidewall surface of said via-hole and a bottom surface of said via-hole, with plasma containing hydrogen having energy not causing sputtering of said metal interconnection pattern, such that a surface of said interlayer insulation film, said sidewall surface of said via-hole and said bottom surface of said via-hole are terminated by hydrogen, wherein said plasma in said preprocessing step is a mixed gas plasma of a rare gas and a reducing gas containing hydrogen, said plasma has an electron temperature not exceeding 3 eV, and said plasma is excited by radiating a microwave from a planar antenna.