Patent ID: 7390748
Filing Date: 2008-06-24
Classification: C09G,H01L

Abstract:
1. A method for polishing a wafer, the method comprising the steps of: providing a semiconductor wafer having a topography including a first topography location and a different second topography location; applying a slurry that includes an additive for forming a polishing inhibiting layer in situ across the topography, wherein the additive and a surface of the topography have opposite electrostatic charges to ensure adhesion of the polishing inhibiting layer to the surface of the topography, the polishing inhibiting layer creating a polishing rate for the topography that is non-linear with polishing pressure; wherein the additive includes one of: an anionic surfactant and a cationic surfactant and wherein the cationic surfactant includes a chemical structure selected from the group consisting of: chemical mechanical polishing the topography.