Patent ID: 7041599

Claim:
A method of planarizing a substrate surface containing a copper or copper alloy layer disposed on a barrier layer comprising: (a) polishing the substrate surface on a first platen with a first polishing composition to reduce a copper or copper alloy layer at a first removal rate, wherein the first polishing composition comprises: about 1 wt. % to about 10 wt. % of an oxidizer; about 0.05 wt. % to about 0.20 wt. % of an inhibitor; about 1.0 wt. % to about 5.0 wt. % of a first chelating agent; about 3.0 wt. % to about 15.0 wt. % of a second chelating agent, wherein the first chelating agent is different from the second chelating agent; and deionized water; and (b) polishing the substrate on a second platen with a second polishing composition to remove the copper or copper alloy layer at a second removal rate less than the first removal rate, wherein the second composition comprises an oxidizer.