Patent ID: 7863744

Claim:
A semiconductor device, comprising: an insulating film formed above a substrate and provided with a concave portion in a predetermined location; a barrier metal film covering inner side and bottom walls of said concave portion; a metal film composed of copper, provided so as to be in contact with said barrier metal film, and buried in an interior of said concave portion; and an electrically conducting film provided so as to be in contact with the top of said metal film composed of copper and also provided over substantially the entire top surface of said metal film composed of copper, said electrically conducting film containing cobalt (Co) or nickel (Ni) as constituent element, wherein an upper surface of said metal film composed of copper is provided so as to be closer to the substrate than an upper surface of said barrier metal film disposed over the inner side wall of said concave portion; and wherein Co concentration or Ni concentration in said electrically conducting film in vicinity of the inner side wall of said barrier metal film is higher than Co concentration or Ni concentration in said electrically conducting film in the central region of said concave portion.