Lithographic apparatus
First Claim
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1. A lithographic projection apparatus comprising:
- a support structure for supporting a patterning device, the patterning device serving to pattern a beam of radiation according to a desired pattern;
a substrate table for holding a substrate, the substrate having a first side and a second side;
a projection system for imaging the patterned beam onto a target portion on a first side of the substrate, while the second side of the substrate faces the substrate table;
an alignment system for aligning a pattern of the patterning device with an alignment mark provided on the substrate, using alignment radiation;
a fluid system constructed and arranged to allow a fluid to be present between the projection system and the substrate;
an optical system for providing an image of said alignment mark for use by the alignment system, said optical system being constructed and arranged to direct the aligmnent radiation via the second side of the substrate, anda processor arranged to control said alignment system and to control a fluid supply of the fluid system such that said aligning is performed while said fluid supply supplies fluid between the projection system and the substrate.
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Abstract
A lithographic projection apparatus is provided with an optical system built into the wafer table for producing an image of a wafer mark that is provided on the back side of the wafer. The image is located at the plane of the front side of the wafer and can be viewed by an alignment system from the front side of the wafer. Simultaneous alignment between marks on the back and front of the wafer and a mask can be performed using a pre-existing alignment system. The lithographic projection apparatus is further provided with immersion system for providing a fluid between the lens and the substrate.
47 Citations
18 Claims
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1. A lithographic projection apparatus comprising:
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a support structure for supporting a patterning device, the patterning device serving to pattern a beam of radiation according to a desired pattern; a substrate table for holding a substrate, the substrate having a first side and a second side; a projection system for imaging the patterned beam onto a target portion on a first side of the substrate, while the second side of the substrate faces the substrate table; an alignment system for aligning a pattern of the patterning device with an alignment mark provided on the substrate, using alignment radiation; a fluid system constructed and arranged to allow a fluid to be present between the projection system and the substrate; an optical system for providing an image of said alignment mark for use by the alignment system, said optical system being constructed and arranged to direct the aligmnent radiation via the second side of the substrate, and a processor arranged to control said alignment system and to control a fluid supply of the fluid system such that said aligning is performed while said fluid supply supplies fluid between the projection system and the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Device manufacturing method comprising:
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projecting a patterned beam of radiation through a fluid and onto a first side of a substrate, using a patterning device, while a second side of said substrate faces a supporting substrate table; aligning a pattern of the patterning device with an image of an alignment mark provided on the substrate; and imaging said alignment mark by directing alignment radiation via the second side of the substrate, wherein said aligning is performed while said fluid is between a projection system of a lithographic apparatus used in the method and the substrate. - View Dependent Claims (15, 16, 17)
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18. A lithographic projection apparatus comprising:
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a support structure for supporting a patterning device, the patterning device serving to pattern a beam of radiation according to a desired pattern; a substrate table for holding a substrate, the substrate having a first side and a second side; a projection system for imaging the patterned beam onto a target portion on a first side of the substrate, while the second side of the substrate faces the substrate table; an alignment system, located on a same side of the substrate as the projection system, for aligning a pattern of the patterning device with an alignment mark provided on the substrate, using alignment radiation; a fluid system constructed and arranged to allow a fluid to be present between the projection system and the substrate; and an optical system for providing an image of said alignment mark for use by the alignment system, said optical system being constructed and arranged to direct the alignment radiation via the second side of the substrate, wherein said alignment system and said fluid system are constructed and arranged such that the aligning of said pattern is performed while said fluid system supplies fluid between the projection system and the substrate.
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Specification