Patent ID: 8563436

Claim:
A method for chemical mechanical polishing of a semiconductor wafer containing a nonferrous metal, comprising: (a) providing a chemical mechanical polishing composition comprising 1 to 25 wt % of an oxidizer; 0.01 to 15 wt % of an inhibitor for the nonferrous metal; 0.005 to 5 wt % of a copolymer of poly(ethylene glycol) methyl ether(meth)acrylate and 1-vinylimidazole; and water; wherein the chemical mechanical polishing composition has an acidic pH; (b) providing a chemical mechanical polishing pad; (c) providing a semiconductor wafer containing the nonferrous metal; (d) creating dynamic contact between the chemical mechanical polishing pad and the semiconductor wafer and (e) dispensing the polishing solution at or near the interface between the chemical mechanical polishing pad and the semiconductor wafer.