Patent ID: 8462314
Filing Date: 2013-06-11
Classification: G03F

Abstract:
1. A lithographic apparatus, comprising: a projection system configured to project a patterned radiation beam onto a target portion of a substrate; and a barrier member, surrounding a space between the projection system and, in use, the substrate, to define in part with a lower surface of a final optical element of the projection system a reservoir for liquid, wherein a radially outer surface of the barrier member facing a portion of the projection system and a radially outer surface of the portion facing the barrier member each have a liquidphobic outer surface, the liquidphobic outer surface of the barrier member and/or the liquidphobic outer surface of the portion has an inner edge that defines in part the reservoir, the radially outer surface of the barrier member comprising a substantially horizontal surface wherein the liquidphobic outer surface of the barrier member covers at least part of or substantially all of the horizontal surface and wherein, in use, the liquid in the reservoir reaches to at or above the level of the substantially horizontal surface.