Patent ID: 7687918

Claim:
A semiconductor device comprising: a semiconductor substrate; an insulating film formed on said semiconductor substrate; and a metal interconnect embedded in said insulating film, wherein said metal interconnect comprises: a base layer; and an upper layer including atoms of a solid solution element disposed above said base layer, wherein said upper layer is disposed at a first side of said metal interconnect that is opposite to a second side of said interconnect which is proximate to the semiconductor substrate, wherein said metal interconnect comprises a first region where a via is provided and a second region where said via is not provided, and said solid solution element exists at said first regions and said second region, wherein said semiconductor device further comprises a barrier metal film formed on said first side of said metal interconnect and said second side of said metal interconnect, wherein said base layer includes atoms of said solid solution element, and wherein a concentration of said atoms of said solid solution element in said base layer is lower than a concentration of said atoms of said solid solution element in said upper layer.