Methods and system for lithography process window simulation
First Claim
1. A computer-implemented method of simulating imaging performance of a lithographic process utilized to image a target design having a plurality of features, said method comprising:
- determining, using a computer, a function for generating a simulated image, said function having one or more variables accounting for process window variations from a nominal process condition associated with said lithographic process; and
generating, using the computer, said simulated image utilizing said function;
said simulated image representing an imaging result of said target design for said lithographic process.
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Abstract
A method of efficient 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. In one given embodiment, the function for simulating the aerial images with focus and dose (exposure) variation is defined as:
I(x,f,1+ε)=I0(x)+└ε·I0(x)+(1+ε)·a(x)·(f−f0)+(1+ε)·b(x)·(f−f0)2┘
where IO represents image intensity at nominal focus and exposure, fO represents nominal focus, f and ε represent an actual focus-exposure level at which the simulated image is calculated, and parameters “a” and “b” represent first order and second order derivative images with respect to focus change.
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Citations
22 Claims
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1. A computer-implemented method of simulating imaging performance of a lithographic process utilized to image a target design having a plurality of features, said method comprising:
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determining, using a computer, a function for generating a simulated image, said function having one or more variables accounting for process window variations from a nominal process condition associated with said lithographic process; and generating, using the computer, said simulated image utilizing said function;
said simulated image representing an imaging result of said target design for said lithographic process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A computer-implemented method of estimating feature edge shift or critical dimension (CD) change due to process window parameter variation of a lithographic process, said method comprising the steps of:
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determining, using a computer, a function for generating a simulated image, said function having one or more variables accounting for process window variations from a nominal process condition associated with said lithographic process; and generating, using the computer, said simulated image utilizing said function;
said simulated image representing an imaging result of said target design for said lithographic process; andestimating, using the computer, said feature edge shift or CD change by analyzing said simulated image. - View Dependent Claims (11)
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12. A computer program product having a non-transitory computer readable medium bearing a computer program for simulating imaging performance of a lithographic process utilized to image a target design having a plurality of features, the computer program, when executed, causing a computer to perform the steps of:
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determining a function for generating a simulated image, said function having one or more variables accounting for process window variations from a nominal process condition associated with said lithographic process; and generating said simulated image utilizing said function;
said simulated image representing the imaging result of said target design for said lithographic process. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A computer program product having a non-transitory computer readable medium bearing a computer program for estimating feature edge shift or critical dimension (CD) change due to process window parameter variation of a lithographic process, the computer program, when executed, causing a computer to perform the steps of:
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determining a function for generating a simulated image, said function having one or more variables accounting for process window variations from a nominal process condition associated with said lithographic process; generating said simulated image utilizing said function;
said simulated image representing an imaging result of a target design for said lithographic process; andestimating said feature edge shift or CD change by analyzing said simulated image. - View Dependent Claims (22)
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Specification