Lithographic apparatus with cleaning of substrate table
First Claim
1. A cleaning method used in a lithographic apparatus in which a substrate held on a holding portion of a substrate table is exposed by projecting a patterned beam of radiation from a projection system onto the substrate through an immersion liquid that is supplied by a supply unit and that covers a portion of a surface of the substrate during the exposure, the method comprising:
- moving the substrate table in a state in which the substrate is not held on the holding portion of the substrate table and in which an object, that is not subjected to an exposure for device-manufacturing, is held on the holding portion in place of the substrate; and
cleaning a measurement portion of the substrate table using a cleaning liquid, that is different from the immersion liquid, supplied by the supply unit onto the substrate table when the substrate table is in the state in which the substrate is not held on the holding portion and in which the object is held on the holding portion in place of the substrate, the measurement portion being used for a measurement and the measurement portion being different from the holding portion,wherein the cleaning liquid removes foreign matter from the measurement portion.
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Accused Products
Abstract
There is provided an exposure apparatus capable of accurately performing an exposure process and a measurement process based on a liquid immersion method. The exposure apparatus (EX), which forms a liquid immersion area (AR2) of a liquid (LQ) on an image surface side of a projection optical system (PL), and exposes a substrate (P) via the projection optical system (PL) and the liquid (LQ) of the immersion area (AR2), is provided with a measuring device (60) which measures at least one of a property and composition of the liquid (LQ) for forming the liquid immersion area (AR2).
298 Citations
25 Claims
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1. A cleaning method used in a lithographic apparatus in which a substrate held on a holding portion of a substrate table is exposed by projecting a patterned beam of radiation from a projection system onto the substrate through an immersion liquid that is supplied by a supply unit and that covers a portion of a surface of the substrate during the exposure, the method comprising:
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moving the substrate table in a state in which the substrate is not held on the holding portion of the substrate table and in which an object, that is not subjected to an exposure for device-manufacturing, is held on the holding portion in place of the substrate; and cleaning a measurement portion of the substrate table using a cleaning liquid, that is different from the immersion liquid, supplied by the supply unit onto the substrate table when the substrate table is in the state in which the substrate is not held on the holding portion and in which the object is held on the holding portion in place of the substrate, the measurement portion being used for a measurement and the measurement portion being different from the holding portion, wherein the cleaning liquid removes foreign matter from the measurement portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for making a lithographic apparatus, the method comprising:
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providing a substrate table having a holding portion on which a substrate is held; providing a supply unit; providing a projection system having a final optical element, a patterned beam of radiation being projected onto the substrate through an immersion liquid, the immersion liquid being supplied by the supply unit between the final optical element of the projection system and the substrate and covering a portion of a surface of the substrate; and providing a cleaning device, which cleans a measurement portion of the substrate table using a cleaning liquid supplied by the supply unit, that is different from the immersion liquid, onto the substrate table in a state in which the substrate is not held on the holding portion of the substrate table and in which an object, that is not subjected to an exposure for device-manufacturing, is held on the holding portion in place of the substrate, the measurement portion of the substrate table being used for a measurement and the measurement portion being different from the holding portion, wherein the cleaning liquid removes foreign matter from the measurement portion.
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Specification