Patent ID: 8466055

Claim:
A method of manufacturing a semiconductor device, said method comprising: forming a first insulating layer; forming a trench in said first insulating layer; forming an interconnect in said trench; forming a space between said first insulating layer and said interconnect, and disposing an upper surface of said interconnect at a position higher than an upper surface of said first insulating layer; forming a first damaged layer changed from said first insulating layer over a side wall of said trench in said forming said trench; forming a second damaged layer changed from said first insulating layer over a surface of said first insulating layer between said forming said interconnect, and said forming said space and disposing said upper surface of said interconnect; forming an air gap in said space and forming an etching stopper film over said first insulating layer and said interconnect; forming a second insulating layer over said etching stopper film; forming a via in said second insulating layer to be disposed over said interconnect; and forming a metal cap film over said interconnect after said forming said interconnect and before said forming said etching stopper film and said air gap, wherein, in said forming said etching stopper film and said air gap, said etching stopper film is formed over said metal cap film.