Patent ID: 7892976

Claim:
A method for manufacturing a semiconductor device, comprising: forming a first insulating film on a substrate; forming an interconnect trench in said first insulating film; forming a first copper containing metal film in said interconnect trench; forming a second insulating film on said first copper containing metal film; forming a connection hole reaching an upper face of said first copper containing metal film from an upper face of said second insulating film, in said second insulating film; forming a seed metal film including a copper element and different metal elements so as to come into contact with an upper face of said first copper containing metal film, on an inner portion of said connection hole; forming a second copper containing metal film so as to come into contact with an upper face of said seed metal film, on an inner portion of said connection hole; and carrying out heat treatment of said first copper containing metal film and said seed metal film, thereby distributing the different metal elements into the first copper containing metal film.