Substrate placement in immersion lithography
First Claim
Patent Images
1. A lithographic projection apparatus comprising:
- a substrate table configured to hold a substrate, the substrate table having a depression configured to receive the substrate;
a projection system configured to project a patterned beam onto a target portion of the substrate;
a liquid supply system configured to provide a liquid, through which the patterned beam is to be projected, in a space between the projection system and the substrate;
a sensor system configured to measure a position of the substrate or of another substrate, a sensor system configured to measure a gap between an edge of the substrate, or of another substrate, disposed inside the depression and an edge of the depression, or a sensor system configured to measure both the position and the gap; and
a substrate handling system configured to position, using the measurement by the sensor system or a parameter derived from the measurement, the substrate inside the depression such that the gap between the edge of the substrate and the edge of the depression is substantially uniform inside the depression.
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Abstract
A method for determining an offset between a center of a substrate and a center of a depression in a chuck includes providing a test substrate to the depression, the test substrate having a dimension smaller than a dimension of the depression, measuring a position of an alignment mark of the test substrate while in the depression, and determining the offset between the center of the substrate and the center of the depression from the position of the alignment mark.
101 Citations
53 Claims
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1. A lithographic projection apparatus comprising:
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a substrate table configured to hold a substrate, the substrate table having a depression configured to receive the substrate; a projection system configured to project a patterned beam onto a target portion of the substrate; a liquid supply system configured to provide a liquid, through which the patterned beam is to be projected, in a space between the projection system and the substrate; a sensor system configured to measure a position of the substrate or of another substrate, a sensor system configured to measure a gap between an edge of the substrate, or of another substrate, disposed inside the depression and an edge of the depression, or a sensor system configured to measure both the position and the gap; and a substrate handling system configured to position, using the measurement by the sensor system or a parameter derived from the measurement, the substrate inside the depression such that the gap between the edge of the substrate and the edge of the depression is substantially uniform inside the depression. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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(i) measuring a gap between an edge of a substrate or of another substrate and an edge of a depression of a substrate table, or (ii) measuring a position of the substrate or of another substrate, or (iii) measuring the edge of the depression, or (iv) any combination selected from (i)-(iii); and using the measurement or a parameter derived from the measurement, positioning the substrate inside the depression such that the gap between the edge of the substrate and the edge of the depression is substantially uniform inside the depression and/or positioning the substrate so as to allow the substrate to enter inside the depression without colliding with a surface of the substrate table or the edge of the depression in the substrate table; and projecting a patterned beam onto a target portion of the substrate. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A lithographic projection apparatus comprising:
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a substrate table configured to hold a substrate, the substrate table having a depression configured to receive the substrate; a projection system configured to project a patterned beam onto a target portion of the substrate; a sensor configured to measure the substrate or another substrate; a substrate handling system configured to determine, based on measurement by the sensor, a centering offset of a central portion of the substrate or of another substrate, with respect to a central portion of the depression, and configured to position the substrate inside the depression by shifting a position of the substrate by an offset to correct for the centering offset to allow the substrate to enter inside the depression without colliding with a surface of the substrate table or an edge of the depression in the substrate table. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A lithographic projection apparatus comprising:
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a substrate table configured to hold a substrate, the substrate table having a depression configured to receive the substrate; a projection system configured to project a patterned beam onto a target portion of the substrate; a sensor system configured to measure (i) a position of the substrate or of another substrate, or (ii) a gap between an edge of the substrate, or of another substrate, disposed inside the depression and an edge of the depression, or (iii) measure the edge of the depression, or (iv) any combination selected from (i)-(iii); and a substrate handling system configured to position, using the measurement by the sensor system, the substrate so as to allow the substrate to enter inside the depression without colliding with a surface of the substrate table or the edge of the depression in the substrate table. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A method comprising:
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measuring a parameter of the substrate or of another substrate and/or a parameter of an edge of a depression of a substrate table; determining an offset between a position of a portion of the substrate and a portion of the depression based on the measured parameter; positioning, using the offset, the substrate to enter inside the depression without colliding with a surface of the substrate table or the edge of the depression in the substrate table; and projecting a patterned beam onto a target portion of the substrate. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43)
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44. A lithographic projection apparatus comprising:
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a substrate table configured to hold a substrate, the substrate table having a depression configured to receive the substrate; a projection system configured to project a patterned beam onto a target portion of the substrate; a sensor configured to measure a parameter of the substrate or of another substrate and/or a parameter of an edge of a depression of a substrate table; and a substrate handling system configured to determine an offset between a position of a portion of the substrate and a portion of the depression based on the measured parameter and configured to position, using the offset, the substrate to enter inside the depression without colliding with a surface of the substrate table or the edge of the depression in the substrate table. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification