Patent ID: 8039390

Claim:
A method of manufacturing a semiconductor device, comprising: a groove forming step of forming a groove in an insulating layer made of an insulating material containing Si and O; an alloy film applying step of covering the side surface and the bottom surface of the groove with an alloy film made of an alloy material containing Cu and Mn by sputtering; a thinning step of reducing the thickness of a portion of the alloy film covering the bottom surface of the groove using a reduction rate higher than a reduction rate of the thickness of a portion of the alloy film covering the side surface of the groove; a wire forming step of forming a Cu wire made of a metallic material mainly composed of Cu in the groove after the thinning step; and a barrier film forming step of forming a barrier film made of Mn x Si y O z (x, y and z: numbers greater than zero) between the Cu wire and the insulating layer by heat treatment.