Lithographic apparatus and device manufacturing method
First Claim
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1. A lithographic apparatus, comprising:
- a movable table;
a projection system configured to project a patterned beam of radiation onto a substrate, the projection system comprising a final optical element adjacent the substrate;
a liquid supply system configured to provide an immersion liquid to a space between the final optical element of the projection system and the table; and
an outlet configured to remove immersion liquid from the space, wherein the outlet is further configured to supply a cleaning fluid, of different composition than the immersion liquid, to the space.
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Abstract
A method and apparatus for cleaning the inside of an immersion lithographic apparatus is disclosed. In particular, a liquid supply system of the lithographic apparatus may be used to introduce a cleaning fluid into a space between the projection system and the substrate table of the lithographic apparatus. Additionally or alternatively, a cleaning device may be provided on the substrate table and an ultrasonic emitter may be provided to create an ultrasonic cleaning liquid.
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Citations
18 Claims
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1. A lithographic apparatus, comprising:
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a movable table; a projection system configured to project a patterned beam of radiation onto a substrate, the projection system comprising a final optical element adjacent the substrate; a liquid supply system configured to provide an immersion liquid to a space between the final optical element of the projection system and the table; and an outlet configured to remove immersion liquid from the space, wherein the outlet is further configured to supply a cleaning fluid, of different composition than the immersion liquid, to the space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device manufacturing method, comprising:
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projecting a patterned beam of radiation, using a projection system, onto a substrate; providing an immersion liquid to a space between the projection system and the substrate; removing immersion liquid from the space using an outlet; and supplying a cleaning fluid of different composition than the immersion liquid, to the space using the outlet. - View Dependent Claims (12, 13, 14, 15)
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16. A lithographic apparatus, comprising:
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a projection system configured to project a patterned beam of radiation onto a radiation-sensitive substrate, the projection system comprising a final optical element adjacent the substrate; a liquid supply system configured to provide a liquid to a space between the projection system and the substrate, the liquid supply system comprising a liquid confinement structure configured to at least partly confine the liquid in the space such that the liquid is in direct contact with the final optical element and the liquid confinement structure, the liquid confinement structure having an outlet configured to remove liquid from the space, the outlet being in a bottom surface of the liquid confinement structure; an outlet to supply a cleaning fluid different from the liquid, the outlet to supply the cleaning fluid being part of the liquid confinement structure; and a structure movable with respect to the liquid confinement structure, the structure having a flat upper surface of at least same width as a cross-sectional width of the outlet and the structure having a cleaning device configured to clean a surface of the final optical element, of the liquid confinement structure, or of both the final optical element and the liquid confinement structure, the cleaning device located in or under the upper surface. - View Dependent Claims (17, 18)
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Specification