Patent ID: 9129907
Filing Date: 2015-09-08
Classification: C09G,H01L

Abstract:
1. A chemical-mechanical polishing (CMP) composition consisting essentially of: (a) colloidal silica; (b) at least one onium compound selected from the group consisting of a phosphonium salt, a sulfonium salt, and a combination thereof, wherein the phosphomium salt is selected from the group consisting of tetraphenylphosphonium bromide, methyltriphenylphosphonium bromide, ethyltriphenylphosphonium bromide, butyltriphenylphosphonium bromide, hexyltriphenylphosphonium bromide, benzyltriphenylphosphonium bromide, tetrabutylphosphonium bromide, tetraphenylphosphonium chloride, and tetrabutylphosphonium hydroxide; and the sulfonium salt is selected from a group consisting of trimethylsulfonium bromide, methyldiphenylsulfonium bromide, triphenylsulfonium bromide, dibutyl-2,3-dihydroxypropylsulfonium lactate, and bis-(2-hydroxyethyl)-2,3-dihydroxypropylsulfonium lactate; (c) an aqueous carrier therefore; the composition having a pH of about 5 or less; wherein the colloidal silica is present in the composition in an amount in the range of about 0.05 to about 35 percent by weight and at least one onium salt is present in the composition in an amount in the range of about 0.04 to about 200 micromoles per gram of composition.