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Optical metrology model optimization based on goals

  • US 20060064280A1
  • Filed: 09/21/2004
  • Published: 03/23/2006
  • Est. Priority Date: 09/21/2004
  • Status: Active Grant
First Claim
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1. A method of evaluating optimization of an optical metrology model for use in measuring a wafer structure, the method comprising:

  • a) developing an optical metrology model, the optical metrology model having metrology model variables, which includes profile model parameters of a profile model;

    b) selecting one or more goals for metrology model optimization;

    c) selecting one or more profile model parameters to be used in evaluating the one or more selected goals;

    d) selecting one or more metrology model variables to be set to fixed values;

    e) setting the one or more selected metrology model variables to fixed values;

    f) setting one or more termination criteria for the one or more selected goals;

    g) optimizing the optical metrology model using the fixed values for the one or more selected metrology model variables;

    h) obtaining measurements for the one or more selected profile model parameters using the optimized optical metrology model; and

    i) determining if the one or more termination criteria are met by the obtained measurements.

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