Patent ID: 7709955

Claim:
A semiconductor device comprising; a first insulation film; a Cu wiring which is provided in said first insulation film and includes copper; a second insulation film provided on said first insulation film and said Cu wiring; a third insulation film provided on said second insulation film, said Cu wiring or said Cu wiring and said first insulation film having a lower hole, said second insulation film and said third insulation film having an upper hole communicating with said lower hole, said lower hole being larger in diameter than said upper hole, wherein the lower hole extends underneath the second insulation film; a lower conductive film provided at an internal wall surface of said lower hole; an upper conductive film provided along an internal wall surface of said upper hole; and a conductive film containing copper and filling said upper and lower holes, wherein a part of said lower conductive film is provided along an internal wall surface of said upper conductive film, wherein said upper conductive film is a barrier metal, and wherein said lower conductive film contains a material of said barrier metal and Cu.