Patent ID: 8119524

Claim:
A method of manufacturing a semiconductor device comprising: forming an insulating film above a semiconductor substrate; forming an opening in the insulating film; forming a first film containing a first metal material containing at least one kind of an element selected from the group consisting of Ta, Ti, Co, Zr and Ru above an inside wall and a bottom of the opening in the insulating film; forming a second film including an oxygen-contained copper film above the first film; forming a third film containing copper and a second metal material containing at least one kind of an element selected from the group consisting of Mn, Ti and Al above the second film; forming above the third film a fourth film containing copper, filling the opening with the first film, the second film and the third film formed in; and removing the fourth film, the third film, the second film and the first film above the insulating film to form an interconnection layer buried in the opening, and further comprising after forming the fourth film, forming a barrier layer containing the first metal material, the second metal material and oxygen between the insulating film and the fourth film by thermal processing.