Patent ID: 7994057
Filing Date: 2011-08-09
Classification: C09G,C09K,H01L

Abstract:
1. A chemical-mechanical polishing composition for polishing a substrate comprising: (a) a liquid carrier, (b) an abrasive suspended in the liquid carrier, wherein the abrasive comprises colloidal silica particles, and wherein the colloidal silica particles have a surface which has been treated with an aminosilane compound, (c) at least one acidic component having a pKa of about 1 to about 4, wherein the at least one acidic component is present in an amount of about 500 ppm to about 3000 ppm, and (d) a cationic polymer, wherein the cationic polymer is present in an amount of about 10 ppm to about 100 ppm; wherein the polishing composition has a pH of about 1 to about 3.5.