Patent ID: 7567351
Filing Date: 2009-07-28
Classification: G01B

Abstract:
1. A method of evaluating the characteristics of a semiconductor wafer comprising the steps of: measuring a set of calibration samples with first and second different metrology technologies, said first technology including a first probe beam that is focused onto the wafer with a first spot size and wherein the reflected first probe beam is monitored to generate first output signals, said second technology including a second probe beam that is focused onto the wafer with a second spot size and wherein the reflected second probe beam is monitored to generate second output signals and wherein the first spot size is larger than the second spot size; analyzing the first output signals to determine the characteristics of the calibration samples using a model based analysis and correlating the results with the second output signals; measuring a test sample with the second metrology technology and determining the characteristics of the test samples based on the correlation; and storing the determined characteristics.