Source-mask optimization for a lithography process
First Claim
1. A method for optimizing a source shape and a mask shape for a lithography process comprising:
- performing a mask optimization for the lithography process in accordance with a set of parameter including at least one variable representation, at least one objective and problem constraints;
performing a light source optimization for the lithography process in accordance with the set of parameters;
performing a joint light source-mask optimization in accordance with the set of parameters; and
iterating, by a hardware processor, at least one of said mask optimization or said light source optimization by changing at least one of the variable representation, the objective or-the problem constraints to maximize a common process window for the lithography process, wherein the iterating evolves the at least one objective, wherein the iterating is repeated such that at least one initial stage of iteration maximizes a weakest window and wherein the common process window is maximized in a last stage of iteration.
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Abstract
Systems and methods for optimizing a source shape and a mask shape for a lithography process are disclosed. One such method includes performing a mask optimization for the lithography process in accordance with a set of parameters including at least one variable representation, at least one objective and problem constraints. Further, a light source optimization for the lithography process is performed in accordance with the set of parameters. In addition, a joint light source-mask optimization is performed in accordance with the set of parameters. The method further includes iterating at least one of the mask optimization or the light source optimization by changing at least one of the variable representation, the objective or the problem constraints to maximize a common process window for the lithography process.
29 Citations
16 Claims
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1. A method for optimizing a source shape and a mask shape for a lithography process comprising:
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performing a mask optimization for the lithography process in accordance with a set of parameter including at least one variable representation, at least one objective and problem constraints; performing a light source optimization for the lithography process in accordance with the set of parameters;
performing a joint light source-mask optimization in accordance with the set of parameters; anditerating, by a hardware processor, at least one of said mask optimization or said light source optimization by changing at least one of the variable representation, the objective or-the problem constraints to maximize a common process window for the lithography process, wherein the iterating evolves the at least one objective, wherein the iterating is repeated such that at least one initial stage of iteration maximizes a weakest window and wherein the common process window is maximized in a last stage of iteration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for optimizing a source shape and a mask shape for a lithography process comprising:
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a mask optimization module configured to perform a mask optimization for the lithography process in accordance with a set of parameters including at least one variable representation, at least one objective and problem constraints; a source optimization module configured to perform a light source optimization for the lithography process in accordance with the set of parameters, wherein iterations of at least one of said mask optimization or said light source optimization maximizes a weakest window during initial stages of the iterations and wherein the common process window is maximized in a last stage of the iterations; a joint source-mask optimization module configured to perform a joint light source-mask optimization in accordance with the set of parameters; and a controller implemented by a hardware processor and configured to direct at least one of the mask optimization module or the source optimization module to iterate at least one of said mask optimization or said light source optimization by changing at least one of the variable representation, the objective or the problem constraints to maximize a common process window for the lithography process. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification