Patent ID: 8496843

Claim:
A method for chemical mechanical polishing of a substrate, comprising: providing a substrate, wherein the substrate comprises polysilicon and at least one of silicon oxide and silicon nitride; providing a chemical mechanical polishing composition, consisting of, as initial components: water; an abrasive; an alkyl aryl polyether sulfonate compound, wherein the alkyl aryl polyether sulfonate compound has a formula wherein R is a branched C 6-10 alkyl group; n is 2 to 8; and, M is selected from the group consisting of H, Na, K, L 1 and NH 4 ; and, optionally, a pH adjusting agent, wherein the pH adjusting agent is an inorganic acid; providing a chemical mechanical polishing pad with a polishing surface; moving the polishing surface relative to the substrate; dispensing the chemical mechanical polishing composition onto the polishing surface; and, abrading at least a portion of the substrate to polish the substrate; wherein at least some of the polysilicon is removed from the substrate; wherein at least some of the at least one of silicon oxide and silicon nitride is removed from the substrate; and, wherein the alkyl aryl polyether sulfonate compound suppresses the removal rate of polysilicon.