Patent ID: 7524616
Filing Date: 2009-04-28
Classification: B82Y,G03F

Abstract:
1. A method of performing immersion photolithography comprising: projecting light along an optical path to form a light pattern on a substrate comprising a wafer that is at least in part coated with a layer comprising photoresist, at least a portion of said light passing through (a) at least one photomask with at least one pattern, (b) at least final optics, and (c) a medium having semiconductor nano-sized particles dispersed therein, said semiconductor nano-sized particles having a refractive index higher than said medium, the semiconductor nano-sized particle dispersed medium filling up space between said final optics and said substrate; collecting on said photoresist, a portion of said light passing through said at least one photomask, said final optics and the semiconductor nano-sized Particle dispersed medium; and changing the solubility of said photoresist at least in part in response to said collected light pattern.