Reflection mask for EUV photolithography and method of fabricating the reflection mask

Abstract

A reflection mask for extreme ultraviolet (EUV) photolithography and a method of fabricating the same, in which the reflection mask includes a substrate, a lower reflection layer formed in a multi-layer structure on the substrate and including a material reflecting EUV light, an upper reflection layer formed in a multi-layer structure on the lower reflection layer and reflecting EUV light, and a phase reversing layer formed between the lower reflection layer and the upper reflection layer in a certain pattern and causing destructive interference between reflection light from the upper reflection layer and reflection light from the lower reflection layer. An incidence of a shadow effect can be reduced and unnecessary EUV light can be eliminated, so that a pattern on the reflection mask can be projected precisely on a silicon wafer. Since the phase reversing layer includes the same material as the reflection layer and an absorption layer, mask fabrication processes can be handled easily.

Dependencies are inferred from the claim text.