Patent ID: 8314028
Filing Date: 2012-11-20
Classification: C09G,C09K,H01L

Abstract:
1. A method of polishing a layer comprising: performing a first polishing process using a slurry composition on a silicon oxide layer including a first portion having a first height and a second portion having a second height substantially lower than the first height to thereby partially remove the first portion before a polishing pressure is applied to the second portion; and performing a second polishing process on the silicon oxide layer using the slurry composition until the second portion functions as a polish stop layer, wherein the slurry composition includes from about 3 to 20 percent by weight of an abrasive, from about 0.1 to 3 percent by weight of an ionic surfactant, from about 0.01 to 0.1 percent by weight of a nonionic surfactant, from about 0.01 to 1 percent by weight of a polish accelerating agent including an amino acid compound, and a remainder of an aqueous solution including a basic pH-controlling agent and water, and wherein the performing a second polishing process is conducted such that the first portion of the silicon oxide layer is not completely removed by the second polishing process and without reducing the first height to the second height.