Patent ID: 8431490

Claim:
A method for chemical mechanical polishing of a substrate, comprising: providing a substrate, wherein the substrate comprises silicon oxide; providing a chemical mechanical polishing composition, consisting of, as initial components: water; 5 to 25 wt % of an abrasive, wherein the abrasive is a colloidal silica having an average particle size of 10 to 200 nm; a pH adjusting agent, wherein the pH adjusting agent is selected from the group consisting of an inorganic acid and an inorganic base; and 0.001 to 1 wt % of a substance according to formula I wherein R 1 , R 2 and R 3 are each independently selected from a C 1-4 alky group; wherein the chemical mechanical polishing composition has a pH of 10- 11 ; providing a chemical mechanical polishing pad with a polishing surface, wherein the chemical mechanical polishing pad composes a polyurethane polishing layer containing polymeric hollow core microparticles and a polyurethane impregnated non-woven subpad; moving the polishing surface relative to the substrate, wherein at least some of the silicon oxide is removed from 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 the substance according to formula I included in the chemical mechanical polishing composition provides an enhanced silicon oxide removal rate and an improved polishing defectivity performance; wherein the improved polishing defectivity performance is determined with a platen speed of 93 revolutions per minute, a carrier speed of 87 revolutions per minute a chemical mechanical polishing composition flow rate of 200 ml/mm, a nominal down force of 20.7 kPa on a 200 mm polishing machine such that the following expression is satisfied: X<X 0 where X is a count of scratch defects on the polished substrate following a post polish hydrogen fluoride wash for the chemical mechanical polishing composition and X 0 is a count of scratch defects obtained under identical conditions except that the substance according to formula I is absent from the chemical mechanical polishing composition.