Patent ID: 7955980

Claim:
A method of manufacturing a semiconductor device, comprising: forming a trench in an insulating layer over a semiconductor substrate; forming a copper-containing metal layer over said insulating layer and inside said trench; polishing said copper-containing metal layer so as to expose said insulating layer; and cleaning a surface of said copper-containing metal layer and of said insulating layer, after polishing said copper-containing metal layer; wherein said cleaning said surface of said copper-containing metal layer and of said insulating layer includes: a first process including removing copper ion and copper oxide; a second process including reducing, after said first process, said copper ion and said copper oxide remaining unremoved through said first process, thereby giving copper; a third process including enclosing with an organic layer, after said second process, said copper given through said second process; and a fourth process including giving a negative surface potential to said organic layer and to said insulating layer, after said third process.