Patent ID: 6936543

Claim:
A method of polishing a substrate comprising: (i) contacting a substrate comprising at least one metal layer comprising copper with a chemical-mechanical polishing system comprising: (a) an abrasive having a mean primary particle size of about 100 nm or greater, (b) an amphiphilic nonionic surfactant comprising a head group and a tail group, and having an HLB value of greater than 6, (c) a means for oxidizing the metal layer comprising copper, (d) an organic acid, (e) a corrosion inhibitor, and (f) a liquid carrier; and (ii) abrading at least a portion of the metal layer comprising copper to polish the substrate, wherein the amphiphilic nonionic surfactant is a block or graft copolymer comprising polyoxyethylene and polydimethylsiloxane, polyoxyethylene and polyoxypropylene, or polyoxyethylene and polyethylene.