Patent ID: 8815110
Filing Date: 2014-08-26
Classification: B24B,C09G,H01L

Abstract:
1. A method for polishing an edge of a silicon wafer, wherein the edge consists essentially of silicon, which method comprises: (i) contacting a substrate with a polishing pad and a chemical-mechanical polishing composition consisting essentially of: (a) about 0.5 wt. % to about 20 wt. % of wet-process silica, (b) about 0.01 wt. % to about 5 wt. % of an organic carboxylic acid, (c) about 0.0005 wt. % to about 2 wt. % of an aminophosphonic acid, (d) about 0.01 wt. % to about 5 wt. % of a tetraalkylammonium salt, wherein the tetraalkylammonium salt comprises a anion selected from the group consisting of hydroxide, chloride, bromide, sulfate, and hydrogensulfate, (e) potassium hydroxide, (f) optionally a bicarbonate salt, and (g) water, wherein the polishing composition has a pH of about 8 to about 11, (ii) moving the polishing pad relative to the edge of the silicon wafer with the chemical-mechanical polishing composition therebetween, and (iii) abrading at least a portion of the edge to polish the edge of the silicon wafer.