Patent ID: 8065109
Filing Date: 2011-11-22
Classification: H01L

Abstract:
1. A system for evaluating the metrological characteristics of a surface of a substrate, comprising: an optical substrate measurement system for measuring the surface of the substrate, and a data analyzing system for analyzing data in an evaluation area defined on a substrate, and applying feature-specific filtering schemes to characterize the surface of the substrate, and to use surface-specific metrics for characterizing and quantifying a feature of interest, the surface-specific metrics comprising a range metric for quantifying maximum and minimum deviations on the evaluation area, a deviation metric for quantifying a point deviation having a largest magnitude in a set of point deviations, each of the point deviations comprising an amount of deviation from a reference plane fit to the evaluation area, and a root mean square metric calculated from power spectral density, the data analyzing system further for comparing the metrics with a threshold, and sorting the substrates based at least in part upon the comparison.