Lithographic apparatus and device manufacturing method
First Claim
1. A device manufacturing method, comprising:
- emitting a beam of radiation using an illumination system;
imparting to the beam a pattern in its cross section;
projecting the patterned beam of radiation onto a target portion of a surface of a substrate;
measuring a first respective temperature of a first plurality of regions in the target portion of the substrate;
measuring a second respective temperature of a second plurality of regions in the target portion of the substrate;
calculating a dimensional response from differences between measurements of the first and the second respective temperatures of the first and the second plurality of regions of the substrate; and
concurrently adjusting, in real time, one or more spatial characteristics of the patterned beam relative to a substrate support to compensate for the calculated dimensional response, wherein the spatial characteristics comprise a cross-sectional shape of the patterned beam, a position of the patterned beam, and a size of the patterned beam.
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Accused Products
Abstract
A lithographic apparatus and method in which a patterning system is used to impart to a projection beam a pattern in its cross-section. The beam is directed by a projection system from an illumination system onto a target portion of the surface of a substrate supported on a substrate support. The target portion has predetermined spatial characteristics relative to the substrate table that are appropriate for a desired exposure pattern on the surface of the substrate. The temperature of the substrate is measured, and the dimensional response of the substrate to the measured temperature is calculated. The spatial characteristics of the target portion relative to the substrate table are adjusted to compensate for the calculated dimensional response.
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Citations
18 Claims
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1. A device manufacturing method, comprising:
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emitting a beam of radiation using an illumination system; imparting to the beam a pattern in its cross section; projecting the patterned beam of radiation onto a target portion of a surface of a substrate; measuring a first respective temperature of a first plurality of regions in the target portion of the substrate; measuring a second respective temperature of a second plurality of regions in the target portion of the substrate; calculating a dimensional response from differences between measurements of the first and the second respective temperatures of the first and the second plurality of regions of the substrate; and concurrently adjusting, in real time, one or more spatial characteristics of the patterned beam relative to a substrate support to compensate for the calculated dimensional response, wherein the spatial characteristics comprise a cross-sectional shape of the patterned beam, a position of the patterned beam, and a size of the patterned beam. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method, comprising:
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measuring a first set of temperatures, wherein each temperature corresponds to the temperature at a first different respective regions of a substrate; forming a first pattern of alignment features at the first different respective regions of the substrate having the measured first set of temperatures during an exposure of the substrate; measuring a first set of spatial distributions of the first pattern of alignment features of the substrate occurring during the first set of temperatures; measuring a second set of temperatures, wherein each temperature in the second set corresponds to a second different one of the respective regions of the substrate; forming a second pattern of alignment features at the second different respective regions of the substrate having the measured second set of temperatures during a subsequent exposure of the substrate; measuring a second set of spatial distributions of the alignment features occurring during the second set of temperatures; and determining a dimensional response from differences between measurements of the first set of spatial distributions and measurements of the second set of spatial distributions. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A lithographic apparatus, comprising:
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a temperature measuring system to measure a first and a second set of temperatures, wherein each temperature in the first set corresponds to the temperature at a first different respective regions of a substrate and wherein each temperature in the second set corresponds to a second different one of the respective regions of the substrate; a patterning system to form a first and a second pattern of alignment features at the first different respective regions of the substrate having the measured first set of temperatures during an exposure of the substrate and at the second different respective regions of the substrate having the measured second set of temperatures during a subsequent exposure of the substrate; a metrology system to measure a first and a second set of spatial distributions of the first and the second pattern of alignment features of the substrate occurring during a measurement of the first and the second set of temperatures; and a calculating system to calculate a dimensional response from differences between measurements of the first set of spatial distributions and measurements of the second set of spatial distributions. - View Dependent Claims (17, 18)
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Specification