Patent ID: 8435704
Filing Date: 2013-05-07
Classification: G03F

Abstract:
1. A mask blank for manufacturing a transfer mask adapted to exposure light having a wavelength of 200 nm or less, the mask blank having a light-shielding film on a transparent substrate, wherein the light-shielding film is made of a material containing tantalum, the light-shielding film has a structure in which at least a light-shielding layer and a front-surface antireflection layer are laminated in this order from the transparent substrate side, a highly oxidized layer with an oxygen content of 68 at % or more is formed as a surface layer of the front-surface antireflection layer, that is placed on a side opposite to a transparent substrate side, and an oxygen content of the front-surface antireflection layer is lower than the oxygen content of the highly oxidized layer.