Lithographic thermal distortion compensation with the use of machine learning
First Claim
1. A lithographic exposure tool, comprisingan optical system configured to expose a workpiece to a dose of radiation to form a predetermined image thereon;
- a sensor system in operable cooperation with at least one sub-system of the exposure tool, said sensor system configured to measure data representing a first change in a mutual orientation of first and second components of said sub-system for each of a plurality of values of a parameter of an exposure process;
a first electronic circuitry in operable communication with a tangible storage medium, the storage medium containing program code which, when run by the electronic circuitry, causes the electronic circuitryto estimate a second change in the mutual orientation for a supplementary value of the parameter based on data acquired from the sensor system and to generate a value of the estimated second change;
anda second electronic circuitry configuredto modify a configuration of the exposure tool, based on said value of the estimated second change, by changing a geometrical path to form a modified exposure tool, andto operate the modified exposure tool while having a value of a third change in the mutual orientation smaller than the value of the estimated second change, the third change being a change in the mutual orientation measured with the sensor system during operation of the modified exposure tool,wherein the geometrical path is a path along which a movable stage of said exposure tool, carrying the workpiece during the operation of the exposure tool, is repositioned during the operation of the exposure tool.
1 Assignment
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Accused Products
Abstract
Lithographic exposure tool and method for operating thereof that includes modification of the tool (assessed based on the measurements of geometrical distortions caused, in the tool, by the exposure process and used to train the exposure tool) to ensure that such geometrical distortions are reduced for any chosen exposure process. The method includes processing first data (representing distortions caused by initial exposure run(s)) to estimate second data representing distortions that would occur for another exposure run); and forming a modified exposure tool by changing at least one of a) a geometrical path is a path along which the workpiece stage is repositioned during the operation of the exposure tool; b) one or more of a presence, position, orientation, size and shape of an optical component of an optical projection sub-system of the optical system of the exposure tool; and c) a parameter of scanning synchronization of the exposure tool.
3 Citations
5 Claims
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1. A lithographic exposure tool, comprising
an optical system configured to expose a workpiece to a dose of radiation to form a predetermined image thereon; -
a sensor system in operable cooperation with at least one sub-system of the exposure tool, said sensor system configured to measure data representing a first change in a mutual orientation of first and second components of said sub-system for each of a plurality of values of a parameter of an exposure process; a first electronic circuitry in operable communication with a tangible storage medium, the storage medium containing program code which, when run by the electronic circuitry, causes the electronic circuitry to estimate a second change in the mutual orientation for a supplementary value of the parameter based on data acquired from the sensor system and to generate a value of the estimated second change; and a second electronic circuitry configured to modify a configuration of the exposure tool, based on said value of the estimated second change, by changing a geometrical path to form a modified exposure tool, and to operate the modified exposure tool while having a value of a third change in the mutual orientation smaller than the value of the estimated second change, the third change being a change in the mutual orientation measured with the sensor system during operation of the modified exposure tool, wherein the geometrical path is a path along which a movable stage of said exposure tool, carrying the workpiece during the operation of the exposure tool, is repositioned during the operation of the exposure tool. - View Dependent Claims (2, 3, 4, 5)
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Specification