Patent ID: 7247567

Claim:
A method of chemically-mechanically polishing a substrate comprising tungstcn, which method comprises: (i) contacting a substrate with a polishing pad and a chemical-mechanical polishing composition comprising: (a) a tungsten etchant, (b) an inhibitor of tungsten etching, wherein the inhibitor of tungsten etching is a polymer, copolymer, or polymer blend comprising at least one repeating group comprising at least one nitrogen-containing heterocyclic ring or a tertiary or quaternary nitrogen atom, wherein the inhibitor of tungsten etching is present in an amount of about 1 ppm to about 1000 ppm, and (c) water, (ii) moving the polishing pad relative to the substrate with the polishing composition therebetween, and (iii) abrading at least a portion of the substrate to polish the substrate.