Patent ID: 6206756
Filing Date: 2001-03-27
Classification: C09K,H01L

Abstract:
A chemical-mechanical polishing process comprising:providing a semiconductor wafer having a layer comprising tungsten at greater than or equal to 50% molar;positioning the wafer in proximity with a fixed abrasive chemical-mechanical polishing pad;providing a tungsten layer chemical-mechanical polishing solution intermediate the wafer and pad, the tungsten laver chemical-mechanical polishing solution comprising a tungsten oxidizing component present at from about 0.5% to 15% by volume and a pH of less than or equal to about 6.0;chemical-mechanical polishing the tungsten comprising layer with the fixed abrasive pad with the tungsten layer chemical-mechanical polishing solution being received between the wafer and the pad; andcomplexing tungsten or an oxidation product thereof with a complexing agent in the solution comprising from 0.1% to 10% by weight of the solution.