Patent ID: 8357612

Claim:
A method for manufacturing a semiconductor device, said method comprising: forming a second interlayer film on a first interlayer film having a first contact metal part accommodated therein, wherein said first interlayer film contacts said first contact metal part; forming a trench in said second interlayer film; forming a metal part on said second interlayer film including said trench; forming a hard mask film on said metal part; etching said hard mask film; etching said metal part to form a metal conductor filled in and protruding above said trench; forming sidewalls on lateral surfaces of said hard mask film and said metal conductor above said second interlayer film; forming third interlayer film on top of said second interlayer film inclusive of said hard mask film and said sidewalls; selectively etching said third interlayer film, said second interlayer film and the first interlayer film, to open a self-aligned contact hole between said sidewalls to expose said first contact metal part; and forming a second contact metal part in said self-aligned contact hole.