Patent ID: 7449124
Filing Date: 2008-11-11
Classification: B24B,B24D,C09G,H01L

Abstract:
1. A method for polishing a wafer comprising: providing a wafer comprising a first region comprising silicon dioxide and a second region comprising silicon nitride; contacting said wafer with a three-dimensional, textured, fixed abrasive article comprising a plurality of abrasive particles and a binder; and relatively moving said wafer and said fixed abrasive, article in the presence of a aqueous solution having a pH in the range of 6 to 8, wherein the aqueous solution contains less than 0.1% by weight of inorganic particulates not associated with the fixed abrasive article, further wherein said aqueous solution comprises at least one compound selected the group consisting of a polymethacrylic acid, a polysulfonic acid, and combinations thereof and wherein said compound is present in the range of 1.5 to 4 percent by weight of said aqueous solution.