Patent ID: 7773195

Claim:
A lithography system, comprising: a support structure configured to support a patterning device, the patterning device configured to provide a patterned beam of radiation; a projection system configured to project the patterned beam onto a target portion of a substrate; and a liquid supply system configured to at least partially fill a space between the projection system and the substrate with an immersion liquid having an index of refraction greater than that of water at the wavelength of the patterned beam or comprising an organic fluid having an index of refraction greater than about 1.10, wherein at least a portion of a surface of the liquid supply system comprises PTFE, TFE, or a fluorinated hydrocarbon polymer and wherein the portion of the surface is adjacent or located away from an inlet or outlet of the liquid supply system to the space and is, in use, in contact with liquid supplied to the space from the inlet before removal by the outlet.