Patent ID: 7777346

Claim:
A semiconductor integrated circuit device, comprising: a first insulating film formed over a semiconductor substrate; a first wiring formed in the first insulating film; a second insulating film formed over the first wiring; a third insulating film formed over the second insulating film; a hole formed in the second and third insulating films to connect to the first wiring; a first conductive film formed over the bottom and sidewalls of the hole, wherein the first conductive film has a barrier function to a copper film; and a second conductive film formed over the first conductive film so that the second conductive film is embedded in the hole, and the second conductive film is formed of a copper film or a film of a copper alloy and is formed of different material from the first conductive film; wherein the hole has a portion formed in the first wiring, wherein the thickness of the first conductive film at the center of the bottom of the hole is smaller than the portion of the hole formed in the first wiring, measured as a height distance from an outer surface of the first wiring to the bottom of the hole, wherein the width of the second conductive film formed under the outer surface of the first wiring is smaller than the width of the second conductive film formed over the outer surface of the first wiring, wherein the width of the second conductive film is decreasing continuously toward the bottom of the hole from an outer surface of the second insulating film, and wherein a rate of decrease in the second conductive film formed under the outer surface of the first wiring is larger than a rate of decrease in the second conductive film formed over the outer surface of the first wiring.