Patent ID: 8822340
Filing Date: 2014-09-02
Classification: C09G,C09K,H01L

Abstract:
1. A method for chemical mechanical polishing of a substrate comprising: (a) contacting a substrate comprising a silicon nitride layer and a silicon oxide layer with a colloidal dispersion, the dispersion comprising: (b) performing a CMP process on the substrate, wherein polymer is an amphoteric copolymer selected from the group consisting of: (a) a (block A)-(block B) diblock copolymer, wherein the at least one part A is the block A and the at least one part B is the block B; (b) a (block B)-(block A)-(block B) triblock copolymer, wherein the at least one part A is the block A and the at least one part B is the block B; or (c) a (backbone A)-(side chains B) comb copolymer, wherein the at least one part A is the backbone A and the comb copolymer is a plurality of side chains B each bonded to the backbone A at one of their ends.