Patent ID: 7314688
Filing Date: 2008-01-01
Classification: B82Y,G03F

Abstract:
1. A method of producing a reflection mask blank by forming, on a substrate, at least a multilayer reflection film for reflecting exposure light and an absorber layer formed on said multilayer reflection film for absorbing the exposure light, said method comprising: a first measuring step of measuring a peak reflectance of the multilayer reflection film and a peak wavelength of the reflectance of the multilayer reflection film after the multilayer reflection film is formed on the substrate; a step of carrying out a heat treatment for said substrate with the multilayer reflection film at a substrate heating temperature of said substrate with the multilayer reflection film which temperature is not lower than 50° C. and not higher than a baking temperature of a resist film; a second measuring step of measuring a peak reflectance of the multilayer reflection film and a peak wavelength of the reflectance of the multilayer reflection film after the heat treatment is carried out for said substrate with the multilayer reflection film; and a step of checking whether change in peak wavelength and decrease in peak reflectance due to differences between the peak wavelengths and between the peak reflectances measured in the first and the second measuring steps do not cause mismatching with reflection mirrors of a pattern transfer apparatus using a reflection mask produced from the reflection mask blank and do not thereby cause variation in size of a pattern formed on a semiconductor substrate by the use of the reflection mask.