Patent ID: 7563383

Claim:
A method of polishing a substrate comprising: (i) contacting a substrate comprising a noble metal and silicon oxide on a surface of the substrate, wherein the noble metal is selected from the group consisting of ruthenium, iridium, platinum, palladium, osmium, rhenium, silver, gold, nitrides thereof, oxides thereof, alloys thereof, and combinations thereof, with a chemical-mechanical polishing system comprising: (a) a polishing component selected from the group consisting of an abrasive, a polishing pad, and a combination thereof, (b) an oxidizing agent selected from the group consisting of bromates, bromites, hypobromites, chlorates, chlorites, hypochlorites, perchlorates, hypoiodites, periodates, monoperoxy sulfate, organo-halo-oxy compounds, rare earth salts, and combinations thereof, (c) an ethylene-oxide containing polymer having the structure R(CH 2 CH 2 O) n R′, wherein R is selected from OH, OR″, and R″, and wherein R′ is selected from H or R″, wherein R″ is H or lower alkyl, and wherein n is an integer from about 150 to about 250, and wherein the ethylene-oxide containing polymer suppresses the removal rate of the silicon oxide, and (d) a liquid carrier, and (ii) abrading at least a portion of the noble metal with the chemical-mechanical polishing system to polish the substrate.