Patent ID: 8119529

Claim:
A method for chemical mechanical polishing of a substrate, comprising: providing a substrate, wherein the substrate comprises silicon dioxide; providing a chemical mechanical polishing composition, wherein the chemical mechanical polishing composition comprises: water, 0.1 to 30 wt % abrasive having an average particle size of ≦100 nm; 0.005 to 0.5 wt % diquaternary cation according to formula (I): wherein each X is independently selected from N and P; wherein R 1 is a C 2 -C 6 alkyl group; and, wherein R 2 , R 3 , R 4 , R 5 , R 6 and R 7 are each independently selected from a C 2 -C 6 alkyl group; and 0 to 0.1 wt % quaternary alkylammonium compound; providing a chemical mechanical polishing pad; creating dynamic contact at an interface between the chemical mechanical polishing pad and the substrate with a down force of 0.1 to 5 psi; 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 the chemical mechanical polishing composition has a pH of 2 to 6; and, wherein the chemical mechanical polishing composition exhibits a silicon dioxide removal rate of at least 1,500 Å/min.