Patent ID: 8992286
Filing Date: 2015-03-31
Classification: B24B

Abstract:
1. A method of controlling a polishing operation, comprising: measuring a plurality of spectra reflected from a substrate at a plurality of different positions on the substrate with an in-sequence or in-situ monitoring system to provide a plurality of measured spectra; for each measured spectrum of the plurality of measured spectra, generating a characterizing value based on the measured spectrum; for each characterizing value, determining a goodness of fit of the measured spectrum to another spectrum used in generating the characterizing value to provide a plurality of goodnesses of fit; generating a wafer-level characterizing value map by applying a regression to the plurality of characterizing values with the plurality of goodnesses of fit used as weighting factors in the regression; adjusting a polishing endpoint or a polishing parameter of a polishing apparatus based on the wafer-level characterizing map; and polishing the substrate or a subsequent substrate in the polishing apparatus with the adjusted polishing endpoint or polishing parameter.