Patent ID: 8940462
Filing Date: 2015-01-27
Classification: G03F

Abstract:
1. A photomask blank for use in manufacturing a photomask adapted to be applied with exposure light having a wavelength of 200 nm or less, wherein the photomask blank comprises a transparent substrate, a light-shielding film formed on the transparent substrate and containing molybdenum and silicon, an etching mask film formed in contact with the light-shielding film, and a resist film formed on the etching mask film, and wherein the light-shielding film comprises a light-shielding layer and an antireflection layer in this order from the transparent substrate, the etching mask film is made of a single layer formed of a material composed mainly of CrOCN and has a chromium content of 35 at % or less, total content of oxygen and nitrogen of 40 at % or more, and carbon content of 5 at % to 20 at %, the etching mask film being a film which is removed when a photomask is manufactured, a laminated film comprising the light-shielding film and the etching mask film has a sheet resistance value of 3.0 kΩ/square or less, the resist film having a thickness of 90 nm or less, the etching mask film having a thickness of 5 nm to 15 nm, and the light-shielding film having a thickness of 52 nm or less.