Patent ID: 6838376

Claim:
A method of forming a barrier metal film formed of a nitride film including tungsten by thermal CVD, comprising: (a) positioning a substrate in a processing vessel; (b) forming a WSi film on one side of the substrate by supplying a process gas including WF 6 gas and at least one of SiH 4 gas, SiH 2 Cl 2 gas and Si 2 H 6 gas into the processing vessel while a processing pressure in the processing vessel is maintained; (c) shutting off the supplying of the process gas into the processing vessel; (d) completely removing the process gas from the processing vessel by supplying a purging gas into the processing vessel after the shutting off the supplying; and (e) nitriding the WSi film by supplying NH 3 gas or MMH gas into the processing vessel from which the process gas has been removed, to form a WSixNy film.