Patent ID: 8790160

Claim:
A method for chemical mechanical polishing of a substrate, comprising: providing a substrate, wherein the substrate comprises a germanium-antimony-tellurium phase change alloy; providing a chemical mechanical polishing composition, wherein the chemical mechanical polishing composition comprises, as initial components: water; 0.1 to 5 wt % of an abrasive, wherein the abrasive is a colloidal silica abrasive having an average article size of 110 to 130 nm; 0.001 to 5 wt % of at least one of a phthalic acid, a phthalic anhydride, a phthalate compound and a phthalic acid derivative; 0.001 to 5 wt % of a chelating agent, wherein the chelating agent is selected from ethylene diamine tetra acetic acid ad salts thereof; 0.001 to 0.1 wt % of a poly(acrylic acid-co-maleic acid); 0.001 to 3 wt % of an oxidizing agent, wherein the oxidizing agent is hydrogen peroxide; wherein the chemical mechanical polishing composition has a pH 7.1 to 12; providing a chemical mechanical polishing pad; creating dynamic contact at an interface between the chemical mechanical polishing pad and the substrate; and dispensing the chemical mechanical polishing composition onto the chemical mechanical polishing pad at or near the interface between the chemical mechanical polishing pad and the substrate; wherein at least some of the germanium-antimony-tellurium phase change alloy is removed from the substrate; wherein the chemical mechanical polishing composition exhibits a germanium-antimony-tellurium phase change alloy removal rate of at least 1,000 Å/min with a platen speed of 60 revoluions per minute, a carrier speed of 55 revolutions per minute, a chemical mechanical polishing composition flow rate of 200 ml/min, and a nominal down force of 8.27 kPa (1.2 psi) on a 200 mm polishing machine where the chemical mechanical polishing pad comprises a polyurethane polishing layer containing polymeric hollow core microparticles and a polyurethane impregnated non-woven subpad; and, wherein the chemical mechanical polishing composition facilitates the germanium-antimony-tellurium phase change alloy removal rate of at least 1,000 Å/min with a post polish SP1 defect count (>0.16 μm of no more than 200.