Lithographic apparatus and device manufacturing method
First Claim
1. A lithographic apparatus, comprising:
- a substrate table constructed to hold a substrate;
a projection system configured to project a radiation beam through an exposure slit area onto a target portion of the substrate;
a patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam, the patterned radiation beam at the target portion of the substrate being in focus over a depth of focus (DOF);
a measurement system that is arranged to measure a surface topography of at least part of the target portion,wherein the projection system is arranged to adjust a dimension of the exposure slit area to form an adjusted exposure slit area over which surface topography variations are equal to or smaller than the depth of focus.
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Abstract
The present invention provides a lithographic apparatus, including: a substrate table constructed to hold a substrate; a projection system configured to project a radiation beam through an exposure slit area onto a target portion of the substrate; a patterning device configured to import the radiation beam with a pattern in its cross-section to form a patterned radiation beam, the patterned radiation beam at the target portion of the substrate being in focus over a depth of focus; and a measurement system that is arranged to measure a surface topography of at least part of the target portion, wherein the projection system is arranged to adjust a dimension of the exposure slit area to form an adjusted exposure slit area over which surface topography variations are equal to or smaller than the depth of focus.
2 Citations
17 Claims
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1. A lithographic apparatus, comprising:
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a substrate table constructed to hold a substrate; a projection system configured to project a radiation beam through an exposure slit area onto a target portion of the substrate; a patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam, the patterned radiation beam at the target portion of the substrate being in focus over a depth of focus (DOF); a measurement system that is arranged to measure a surface topography of at least part of the target portion, wherein the projection system is arranged to adjust a dimension of the exposure slit area to form an adjusted exposure slit area over which surface topography variations are equal to or smaller than the depth of focus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device manufacturing method comprising:
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projecting a patterned beam of radiation through an exposure slit area onto a target portion of a substrate, which substrate is arranged on a substrate table constructed to hold the substrate, the patterned radiation beam being in focus over a depth of focus (DOF); using a measurement system to measure a surface topography of at least part of the substrate; and adjusting at least one of a width and a length dimension of the exposure slit area to form an adjusted exposure slit area over which surface topography variations are equal to or smaller than the depth of focus. - View Dependent Claims (15, 16, 17)
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Specification