Patent ID: 7172962
Filing Date: 2007-02-06
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming a diffusion barrier film on a semiconductor substrate and then forming an insulating film on the diffusion barrier film, forming a concave in said insulating film by selectively removing said insulating film and said diffusion barrier film, and forming a barrier metal film over the whole surface of said insulating film including said concave, then forming a metal film filling said concave; conducting a first polishing over a whole surface of said substrate to form a metal area filled in said concave; and conducting a second polishing over said whole surface of said substrate to remove parts of said metal area and of said insulating film; wherein the first polishing is stopped on said barrier metal film; and wherein said second polishing also removes a part of a normal taper formed in an upper part of said concave.