Patent ID: 6083838
Filing Date: 2000-07-04
Classification: H01L

Abstract:
A method of planarizing a surface on a semiconductor wafer containing metal, comprising:selecting a slurry including an abrasive and an oxidant having a known rate of oxidation, said oxidant capable of oxidizing said metal;reducing a said rate of exposure of said metal to said oxidant by altering a property of said slurry, wherein reducing a rate of exposure includes adding a surfactant to said slurry said surfactant selected from the group consisting of an alkyl phenol ethoxylate, fatty alcohol ethoxylate, a fatty amine ethoxylate, propylene oxide-ethylene oxide block copolymers, and ethylene diamine propoxylate ethoxylate;oxidizing said metal at said reduced rate to form and oxidation product of said metal; andremoving said oxidation product with said abrasive to produce a planarized surface of said semiconductor wafer.