Patent ID: 7601273

Claim:
A polishing slurry composition for final polishing a silicon wafer, the composition comprising: an abrasive; a pH-adjusting agent; a water-soluble thickening agent; and a chelating agent, wherein: the chelating agent includes at least one acetate chelating agent and at least one phosphate chelating agent, the polishing slurry composition has an alkaline pH, the acetate chelating agent is selected from the group consisting of ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, N-(hydroxyethyl)ethylenediaminetriacetic acid, nitrilotriacetic acid, and salts thereof, and the phosphate chelating agent is selected from the group consisting of sodium salts of ethylenediaminetetra(methylene phosphonic acid), ammonium salts of ethylenediaminetetra(methylene phosphonic acid), amino tri(methylene phosphonic acid), and diethylenetriaminepenta(methylene phosphonic acid).