Patent ID: 6087047
Filing Date: 2000-07-11
Classification: G03F

Abstract:
A phase shift mask blank for use in manufacturing a half-tone phase shift mask, comprising:a transparent substrate; anda semi-transparent film formed on said transparent substrate, wherein:said semi-transparent film serves to shift the phase of an exposure light beam which transits said semi-transparent film with respect to the phase of an inspection light beam which directly transits said transparent substrate;said semi-transparent film serves to reduce the strength of the exposure light beam, the exposure light beam having a first wavelength and a first transmittance and said inspection light beam having a second wavelength longer than said first wavelength and a second transmittance,said semi-transparent film includes silicon and nickel, and at least one selected from the group consisting of nitrogen, oxygen and hydrogen, andthe content of the nickel as a portion of total content of the silicon and the nickel in said semi-transparent film is selected so that the inspection light beam has the second transmittance at a value wherein said phase shift mask blank can be inspected when the inspection light beam has the second wavelength.