Patent ID: 7790590

Claim:
A selective W-CVD method which comprises the steps of placing, in a vacuum chamber, a substrate provided, on the surface thereof, with an electrical insulating film having hole and/or trench structures which are filled with a Cu-containing electrical interconnection film; heating the substrate at a predetermined temperature; and introducing a raw gas into the vacuum chamber to thus selectively form a W-capping film on the surface of the Cu-containing electrical interconnection film, wherein, prior to the introduction of the raw gas into the vacuum chamber, the surface of the electrical insulating film and that of the Cu-containing electrical interconnection film are subjected to a pre-treatment using, as a gas for the pre-treatment, (1) a gas of a compound containing N and H atoms; (2) a mixed gas comprising a gas of a compound containing an N atom and a gas of a compound containing an H atom; (3) a gas of a compound containing an Si atom; or (4) a mixed gas comprising at least one member selected from the group consisting of the foregoing gas of a compound containing N and H atoms, the mixed gas comprising a gas of a compound containing an N atom and a gas of a compound containing an H atom, and a gas of a compound containing an H atom, in combination with a gas of a compound containing an Si atom.