Lithographic apparatus and device manufacturing method
First Claim
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1. A lithographic apparatus, comprising:
- 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 between the projection system and the substrate such that the liquid is in direct contact with the projection system and the liquid confinement structure, the liquid confinement structure having an aperture between the final optical element and the substrate to allow passage of the beam of radiation through the liquid to an exposure field of the substrate; and
a stage movable with respect to the liquid confinement structure, the stage having a width wider than a width of the aperture and the stage having a cleaning device configured to clean a surface of the final optical element, of the liquid confinement structure, or of both the projection system and the liquid confinement structure.
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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
20 Claims
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1. 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 between the projection system and the substrate such that the liquid is in direct contact with the projection system and the liquid confinement structure, the liquid confinement structure having an aperture between the final optical element and the substrate to allow passage of the beam of radiation through the liquid to an exposure field of the substrate; and a stage movable with respect to the liquid confinement structure, the stage having a width wider than a width of the aperture and the stage having a cleaning device configured to clean a surface of the final optical element, of the liquid confinement structure, or of both the projection system and the liquid confinement structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An exposure apparatus, comprising:
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a projection system configured to project a beam of radiation onto a radiation-sensitive substrate; a liquid confinement structure configured to at least partly confine a liquid in a space between the projection system and the substrate such that the liquid is in direct contact with the projection system and the liquid confinement structure, the liquid confinement structure having an outlet, extending around a path of the beam through the space, to remove liquid; and a stage movable with respect to the liquid confinement structure, the stage having a width to cover an opening of the outlet and having a cleaning device configured to clean a surface of the projection system, of the liquid confinement structure, or of both the projection system and the liquid confinement structure. - View Dependent Claims (12, 13)
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14. A device manufacturing method, comprising:
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projecting a beam of radiation, using a projection system, onto a radiation-sensitive substrate; at least partly confining a liquid in a space between the projection system and the substrate using a liquid confinement structure such that the liquid is in direct contact with the projection system and the liquid confinement structure, the liquid confinement structure having an aperture between the projection system and the substrate to allow passage of the beam of radiation through the liquid to an exposure field of the substrate; moving a stage with respect to the liquid confinement structure, the stage having a width wider than a width of the aperture and the stage having a cleaning device; and cleaning a surface of the projection system, of the liquid confinement structure, or of both the projection system and the liquid confinement structure, using the cleaning device. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification