Patent ID: 7936069

Claim:
A semiconductor device comprising; a first insulation film; a Cu wiring provided in said first insulation film, including copper, and having a lower hole; a second insulation film provided on said first insulation film; a third insulation film provided on said second insulation film, said second insulation film and said third insulation film having an upper hole formed over said lower hole, wherein the lower hole extends underneath the second insulation film; a first barrier metal provided along an internal wall surface of said upper hole; a predetermined conductive film provided along an internal wall surface of said first barrier metal in said upper hole and along said lower hole, wherein said predetermined conductive film includes a material of the first barrier metal and Cu; and a conductive film containing copper and filling said upper and lower holes, wherein a lower end of said first barrier metal is higher than a lower end of said predetermined conductive film, wherein said lower hole narrows gradually from an upper portion of said lower hole to a lower portion of said lower hole.