Photomask blank and photomask

摘要

A photomask blank comprising a transparent substrate on which are formed at least one light-shielding film and at least one antireflective film minimizes film stress and eliminates substrate warp following deposition of the light-shielding film and the antireflective film, when each film is composed of a CrCO layer, a CrCON layer, or a combination of CrCO and CrCON layers. The photomask blank can be accurately patterned without distortion to give a photomask.