Patent ID: 8664110

Claim:
A method of forming a semiconductor device, the method comprising: forming a first interlayer insulating film; forming a hole in the first interlayer insulating film; forming a second interlayer insulating film which buries the hole and covers the first interlayer insulating film; forming an interconnect groove by selectively etching the second interlayer insulating film to leave the second interlayer insulating film in the hole so that the second interlayer insulating film remains over the first interlayer insulating film; and selectively removing the second interlayer insulating film in the hole, wherein the second interlayer insulating film is formed so that the second interlayer insulating film is different in etching rate from the first interlayer insulating film, and wherein each of the first and second interlayer insulating films comprises a silicon-oxycarbide film.