Patent ID: 8591764
Filing Date: 2013-11-26
Classification: B24B,C09G,H01L

Abstract:
1. A working liquid for fixed abrasive chemical mechanical planarization comprising: proline, wherein the concentration of proline is from 1.0% to 4% on a weight basis; and a fluorochemical surfactant having the formula R wherein the working liquid for fixed abrasive chemical mechanical planarization is substantially free of abrasive particles, and wherein the proline and the fluorochemical surfactant are each present in an amount effective to obtain an Oxide Removal Rate of at least 500 angstroms/minute (Å/min) and a Selectivity Ratio of at least 5 when the working liquid is used in chemical mechanical planarization of a wafer having a first region comprising silicon dioxide and a second region comprising silicon nitride.