Patent ID: 9078334
Filing Date: 2015-07-07
Classification: G03F,H05G

Abstract:
1. An extreme ultraviolet light source device comprising: a chamber in which a gas flow from an upstream side of the chamber to a downstream side of the chamber and a droplet stream of a target material are provided, and where the droplet stream is irradiated by laser to produce plasma that generates an extreme ultraviolet light that is reflected and focused by a collector mirror in the chamber; a droplet generator through which a supply of target material is changed into the droplet stream; and a shroud positioned along the droplet stream, the shroud shielding at least a portion of the droplet stream from the gas flow, wherein the shroud has an inner surface that includes non-flat flow guide features that guide target material that may accumulate on the shroud away from the collector mirror and the non-flat flow guide features on the inner surface of the shroud comprise a set of grooves, or ridges, or a braided structure, wherein at least some portions of the non-flat flow guide features lie above or below the inner surface of the shroud.