Patent ID: 8647984

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: forming a groove in an insulating layer made of an insulating material containing Si and O; covering the inner surface of the groove with an alloy film made of an alloy material containing Cu and Mn; stacking a Cu layer made of a metallic material mainly composed of Cu on the alloy film to fill up the groove; forming a barrier film made of Mn x Si y O z (x, y and z: numbers greater than zero) between the Cu layer and the insulating layer by heat treatment; after forming the barrier film, stacking a sacrificial layer made of an insulating material containing Si and O on the Cu layer, wherein a reaction product film made of Mn x Si y O z is formed between the Cu layer and the sacrificial layer during the stacking of the sacrificial layer; removing the sacrificial layer and the reaction product film from the Cu layer after the stacking of the sacrificial layer; and polishing the surface of the Cu layer by chemical mechanical polishing after the removal of the sacrificial layer and the reaction product film.