Patent ID: 8432037
Filing Date: 2013-04-30
Classification: H01L

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