Patent ID: 7026715

Claim:
A semiconductor device comprising: a semiconductor substrate; an interlayer insulating film formed on the semiconductor substrate, the interlayer insulating film comprising a first insulating film formed on the semiconductor substrate and a second insulating film formed on the first insulating film, the first insulating film containing carbon of a concentration, the second insulating film containing carbon of a concentration lower than the concentration of the first insulating film or containing substantially no carbon, wherein a metal wiring of a metal material is embedded in a wiring groove formed in the interlayer insulating film, a width of the wiring groove in the first insulating film is smaller than that in the second insulating film at an interface between the first insulating film and the second insulating film, and the width of the wiring groove in the first insulating film is substantially constant, and the width of the wiring groove in the second insulating film is substantially constant.