Methods and systems for lithography calibration using a mathematical model for a lithographic process
First Claim
1. A calibration method implemented by a computer, the method comprising:
- generating, using the computer, a model for a lithographic process, the model comprising a polynomial series expansion around a nominal value of a physical parameter of the lithographic process; and
fitting the model to measured dimensions of imaging results obtained by applying the lithographic process at a plurality of values of the physical parameter by optimizing at least one polynomial expansion coefficient.
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Abstract
A method of efficient optical and resist parameters calibration based on simulating imaging performance of a lithographic process utilized to image a target design having a plurality of features. The method includes the steps of determining a function for generating a simulated image, where the function accounts for process variations associated with the lithographic process; and generating the simulated image utilizing the function, where the simulated image represents the imaging result of the target design for the lithographic process. Systems and methods for calibration of lithographic processes whereby a polynomial fit is calculated for a nominal configuration of the optical system and which can be used to estimate critical dimensions for other configurations.
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Citations
23 Claims
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1. A calibration method implemented by a computer, the method comprising:
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generating, using the computer, a model for a lithographic process, the model comprising a polynomial series expansion around a nominal value of a physical parameter of the lithographic process; and fitting the model to measured dimensions of imaging results obtained by applying the lithographic process at a plurality of values of the physical parameter by optimizing at least one polynomial expansion coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A non-transitory computer-readable storage medium having computer-executable instructions stored therein for causing a computer to perform a calibration method, the method comprising:
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generating, using the computer, a model for a lithographic process, the model comprising a polynomial series expansion around a nominal value of a physical parameter of the lithographic process; and fitting the model to measured dimensions of imaging results obtained by applying the lithographic process at a plurality of values of the physical parameter by optimizing at least one polynomial expansion coefficient. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification