Patent ID: 8753786
Filing Date: 2014-06-17
Classification: G03F

Abstract:
1. A light pattern exposure method comprising irradiating a pattern of light to a resist film through a photomask using ArF excimer laser light as the light source, wherein the photomask used is such a halftone phase shift mask that it has been irradiated with ArF excimer laser light in a cumulative dose of at least 10 kJ/cm said halftone phase shift mask comprising a transparent substrate and a pattern of halftone phase shift film of a material comprising a transition metal, silicon, nitrogen and oxygen, and said material having an atomic ratio of transition metal to silicon (Met/Si) from 0.18 to 0.25, a nitrogen content of 25 atom % to 50 atom %, and an oxygen content of 5 atom % to 20 atom, except for an outermost surface region extending from the film surface remote from the substrate to a depth of 10 nm.