Patent ID: 7737005
Filing Date: 2010-06-15
Classification: C23C,H01J,H01L,Y10S

Abstract:
1. A film formation method for forming a Ti film and a TiN film on an underlayer comprising an Si-containing substrate or a metal silicide film disposed on a substrate, the film formation method comprising: cleaning a surface of the underlayer; forming a Ti film to have a film thickness of not less than 2 nm but less than 10 nm on the underlayer by CVD using a Ti compound gas; nitriding the Ti film; and forming a TiN film on the Ti film thus nitrided, by CVD using a Ti compound gas and a gas containing N and H, wherein said cleaning a surface of the underlayer comprises removing a natural oxide film of Si present on the surface of the underlayer, and said removing a natural oxide film comprises, supplying HF gas and NH them performing a heat process of heating the intermediate product film at a certain temperature, thereby thermally decomposing the intermediate product film while vaporizing and exhausting decomposition products thus generated.