Patent ID: 8579675
Filing Date: 2013-11-12
Classification: B24B,H01L

Abstract:
1. A method of controlling the chemical mechanical polishing, comprising: polishing a substrate on a first platen using a first set of polishing parameters; obtaining a plurality of measured spectra from at least two zones of the substrate by in-situ optical monitoring during polishing; comparing the plurality of measured spectra with a reference spectrum to evaluate a thickness of each of the at least two zones of the substrate; comparing a thickness of a first zone of the at least two zones with a thickness of a second zone of the at least two zones; determining whether the thickness of the first zone of the at least two zones falls within a predetermined range of the thickness of the second zone of the at least two zones; and if the thickness of the first zone of the at least two zones does not fall within the predetermined range, at least one of