Patent ID: 7786553

Claim:
A semiconductor device comprising: a semiconductor having at least channel, source and drain regions; an insulating film formed on said semiconductor; a gate electrode over the insulating film; a first interlayer insulating film over said insulating film and the gate electrode; a second interlayer insulating film on said first interlayer insulating film, said second interlayer insulating film comprising a different material from said insulating film; a first opening in said insulating film for exposing a portion of said semiconductor; a second opening in said first interlayer insulating film for exposing said portion of said semiconductor layer and a portion of said insulating film that surrounds said first opening; and a third opening in said second interlayer insulating film for exposing said portion of said semiconductor, said portion of said insulating film and a portion of said first interlayer insulating film that surrounds said second opening, wherein edges of at least said third opening are rounded off, and wherein a thickness of the first interlayer insulating film is less than one third of a total thickness of the first and second interlayer insulating films.