Patent ID: 8048809
Filing Date: 2011-11-01
Classification: C09G,C09K,H01L

Abstract:
1. A polishing method, comprising: providing a polysilicon layer on a silicon oxide pattern; providing a first slurry composition onto the polysilicon layer, the first slurry composition comprising about 4.25 to about 18.5 weight percent of an abrasive, about 80 to about 95 weight percent of deionized water, and about 0.05 to about 1.5 weight percent of an additive; polishing the polysilicon layer by a chemical mechanical polishing process using the first slurry composition, such that a portion of the polysilicon layer remains to cover the silicon oxide layer; providing a second slurry composition having a different content than the first slurry composition onto the polysilicon layer, the second slurry composition including a surfactant; and polishing the polysilicon layer using the second slurry composition, such that the silicon oxide pattern is exposed.