Patent ID: 8168352
Filing Date: 2012-05-01
Classification: B82Y,G03F

Abstract:
1. A reflective mask for EUV lithography (EUVL), comprising: a substrate having a mask pattern region of the substrate and an EUV light-absorbing region located outside the mask pattern region of the substrate, the reflectivity of a surface of the EUV light-absorbing region for EUV light being at most 1%; and a reflective layer for reflecting EUV light provided on the mask pattern region of the substrate; the reflective mask having a portion in which an absorber layer is present on the reflective layer and a portion in which no absorber layer is present on the reflective layer, the reflectivity of a surface of the absorber layer for EUV light being from 5 to 15%; wherein the portion in which the absorber layer is present and the portion in which no absorber layer is present are arranged so as to form a mask pattern.