Patent ID: 8133643
Filing Date: 2012-03-13
Classification: B82Y,G03F

Abstract:
1. A reflective mask blank for EUV lithography having a reflective layer for reflecting EUV light and an absorbing layer for absorbing EUV light which are formed in this order on a substrate, the reflective mask blank for EUV lithography being characterized in that the absorbing layer contains at least tantalum (Ta), boron (B), nitrogen (N) and hydrogen (H), and the absorbing layer has a B content that is 1 at % or greater but less than 5 at %, an H content that is between 0.1 and 5 at %, a Ta+N total content that is between 90 and 98.9 at %, and a Ta:N composition ratio (Ta:N) that is between 8:1 and 1:1.