Patent ID: 7728432

Claim:
A semiconductor device comprising: a semiconductor substrate; an insulating film provided on said semiconductor substrate; a plurality of copper interconnections provided on the same level in said insulating film; and a barrier metal provided between said copper interconnection and said insulating film, wherein said copper interconnection comprises: a first copper interconnection having a relatively narrow width; and a second copper interconnection having a relatively wide width; said first copper interconnection having a top surface thereof principally composed of (111) surface of copper, and said second copper interconnection having a top surface thereof principally composed of (200) surface of copper, wherein said barrier metal provided between said first copper interconnection and said insulating film is Ta film, and said barrier metal that is Ta film contacts with said first copper interconnection, and wherein said barrier metal provided between said second copper interconnection and said insulating film is TaN film, and said barrier metal that is TaN film contacts with said second copper interconnection.