Patent ID: 8030737

Claim:
A semiconductor device, comprising: a substrate; an insulating film formed over said substrate; a copper interconnect, having a plurality of hillocks formed over the surface thereof, buried in said insulating film; a first insulating interlayer formed over said insulating film and said copper interconnect with at least one of said plurality of hillocks extending through said first insulating interlayer; a second insulating interlayer formed over said first insulating interlayer; an electroconductive layer formed over said second insulating interlayer; a diffusion barrier film formed over said insulating film and said copper interconnect, wherein said first insulating interlayer is formed over said insulating film and said copper interconnect, while placing said diffusion barrier film in between, wherein the top surface of said at least one hillock is brought into contact with the lower surface of said second insulating interlayer, and said diffusion barrier film is formed along the sidewalls of said plurality of hillocks, and along the top surface of the hillocks other than said at least one hillock brought into contact with the lower surface of said second insulating interlayer.