Patent ID: 8542341

Claim:
An exposure apparatus comprising: a radiation system configured to supply a projection beam of radiation; a patterning device configured to pattern the projection beam according to a desired pattern; a substrate table having an area configured to support a substrate; and a projection system configured to project the patterned beam onto a target portion of the substrate; wherein a part of the projection system and/or a part of the substrate table that during use of the apparatus is exposed to radiation is coated with a hydrophilic coating, the coating comprising a metal oxide, or a photocatalyst, or a semiconductor, or any combination thereof, wherein said apparatus is an immersion lithography apparatus, and wherein an immersion liquid is provided to fill a space between the projection system and the substrate during use of the apparatus, and wherein a portion of the coating is exposed to the immersion liquid during use of the apparatus and another portion of the coating is not exposed to the immersion liquid during use of the apparatus.