Patent ID: 8241821
Filing Date: 2012-08-14
Classification: B82Y,G03F

Abstract:
1. A process for producing a reflective mask blank for EUV lithography (EUVL), comprising alternately laminating a high refractive index film and a low refractive index film on a substrate to form a multilayer reflective film for reflecting EUV light and forming an absorber layer for absorbing EUV light on the multilayer reflective film, wherein the process further comprises after formation of the above multilayer reflective film, heating a portion of a surface of the multilayer reflective film outside a portion to be a mask pattern region in a reflective mask for EUV lithography produced by employing the reflective mask blank for EUV, to reduce the reflectivity of the heated portion of the surface of the multilayer reflective film for EUV light wherein the difference of the reflectivity of the heated portion of the surface of the multilayer reflective film for EUV light between before and after the heating is from 10 to 60%.