Patent ID: 8383509

Claim:
A manufacture method for a semiconductor device comprising: forming a first insulating film containing oxygen over a semiconductor substrate; forming a first recess in the first insulating film; forming a first barrier metal layer on an inner surface of the first recess, the first barrier metal having a thickness of 5 nm or thinner; forming a first copper alloy film on the first barrier metal layer; forming a first metal film filling all other unfilled space in the first recess, the first metal film containing copper; forming a first metal oxide film by heat treatment through reaction between the oxygen in the first insulating film and a metal element in the first copper alloy film; forming a second insulating film containing oxygen over the semiconductor substrate; forming a second recess in the second insulating film; forming a second barrier metal layer on an inner surface of the second recess, the second barrier metal layer having a thickness of 5 nm or thinner; forming a second copper alloy film on the second barrier metal layer; forming a second metal film filling all other unfilled space in the second recess, the second metal film containing copper; and forming a second metal oxide film by heat treatment through reaction between the oxygen in the second insulating film and a metal element in the second copper alloy film; wherein the first barrier metal layer and the second barrier metal layer are made of refractory metal, alloy containing a refractory metal element, or nitride of a refractory metal element, respectively, a volume of the second recess is larger than a volume of the first recess, at least one type of atoms selected from the group consisting of carbon, oxygen, nitrogen, sulfur and chlorine is contained in the first metal film and the second metal film as impurities, an impurity concentration in the first metal film is lower than an impurity concentration in the second metal film.