Patent ID: 7755191

Claim:
A semiconductor device, comprising: a lower layer conductive film formed on a substrate; an interlayer insulating film formed on said lower layer conductive film, said interlayer insulating film consisting of a multi-layer structure and includes an opening that reaches said lower layer conductive film; a barrier insulating film formed to cover the only entire side wall of said opening in said interlayer insulating film, said barrier insulating film includes a material capable of preventing copper from being diffused; an alloy film made of copper and a dissimilar element other than copper, said alloy film directly contacts said lower layer conductive film at the bottom surface of said opening and said alloy film is in contact with said barrier insulating film at the side wall of said opening in order to cover the inside wall of said opening; and an upper layer conductive film containing copper as a main component, said upper layer conductive film is formed on said alloy film in contact with said alloy film to fill the opening, wherein said barrier insulating film is a SiN film consisting of Si and N or a SiCN film.