Patent ID: 8227152
Filing Date: 2012-07-24
Classification: B82Y,G03F

Abstract:
1. A reflective mask blank for EUV lithography, comprising: a substrate; a reflective layer which reflects EUV light; an absorbing layer which absorbs EUV light; and a low-reflective layer with respect to a mask pattern inspection light in a range of 190 nm to 260 nm, wherein the reflective layer, absorbing layer and the low-reflective layer are formed over the substrate in an order of the reflective layer, the absorbing layer and the low-reflective layer, the low-reflective layer comprises Ta, O and H, and the low-reflective layer has a total content of Ta and O in a range between 85 and 99. 9 at % and a hydrogen content in a range between 0.1 and 15 at %.