Patent ID: 8920667

Claim:
A method of polishing a substrate comprising: (i) providing a substrate, wherein the substrate comprises polybenzoxazole; (ii) providing a polishing pad; (iii) providing a chemical-mechanical polishing composition comprising: (a) abrasive particles, wherein the abrasive particles comprise zirconia, (b) at least one metal ion oxidizer, wherein the at least one metal ion oxidizer comprises metal ions of Co 3+ , Au + , Ag + , Pt 2+ , Hg 2+ , Cr 3+ , Fe 3+ , Ce 4+ , or Cu 2+ , wherein the at least one metal ion oxidizer is present in the chemical-mechanical polishing composition at a concentration of about 0.025 wt. % to about 0.5 wt. %, and (c) an aqueous carrier, wherein the pH of the chemical-mechanical polishing composition is in the range of about 1 to about 7, and wherein the chemical-mechanical polishing composition does not contain a peroxy-type oxidizer; (iv) contacting the substrate with the polishing pad and the chemical-mechanical polishing composition; and (v) moving the polishing pad and the chemical-mechanical polishing composition relative to the substrate to abrade at least a portion of the organic polymer film on a surface of the substrate to polish the substrate.