Flows of optimization for lithographic processes
First Claim
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1. A method to improve a lithographic process for imaging a portion of a design layout onto a substrate using a lithographic projection apparatus comprising projection optics and an illumination system configured to output an illumination, the method comprising:
- obtaining an illumination shape and a mask defocus value;
optimizing, by a hardware computer system, a dose of the lithographic process; and
optimizing, by the hardware computer system, the portion of the design layout for each of a plurality of slit positions of the illumination.
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Abstract
A method to improve a lithographic process for imaging a portion of a design layout onto a substrate using a lithographic projection apparatus having an illumination system and projection optics, the method including: obtaining an illumination source shape and a mask defocus value; optimizing a dose of the lithographic process; and optimizing the portion of the design layout for each of a plurality of slit positions of the illumination source.
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Citations
20 Claims
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1. A method to improve a lithographic process for imaging a portion of a design layout onto a substrate using a lithographic projection apparatus comprising projection optics and an illumination system configured to output an illumination, the method comprising:
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obtaining an illumination shape and a mask defocus value; optimizing, by a hardware computer system, a dose of the lithographic process; and optimizing, by the hardware computer system, the portion of the design layout for each of a plurality of slit positions of the illumination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A computer program product comprising a non-transitory computer readable medium having instructions recorded thereon, the instructions, when executed by a computer system, configured to:
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obtain an illumination shape of an illumination to be produced by an illumination system of a lithographic projection apparatus, and a mask defocus value; optimize a dose of a lithographic process for imaging a portion of a design layout onto a substrate using the lithographic projection apparatus; and optimize the portion of the design layout for each of a plurality of slit positions of the illumination. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification