Patent ID: 11860533
Assignee: APPLIED MATERIALS, INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. A method of manufacturing an extreme ultraviolet (EUV) mask blank comprising:
forming on a substrate a multilayer stack which reflects EUV radiation, the multilayer stack comprising a plurality of reflective layer pairs;
forming a capping layer on the multilayer stack; and
forming an absorber on the capping layer, the absorber comprising a first layer on the capping layer, the first layer selected from the group consisting of Mo, Nb, V, alloys of Mo, Nb and V, oxides of Mo, oxides of Nb, oxides of V, nitrides of Mo, nitrides of Nb and nitrides of V and a second layer on the first layer, the second layer an alloy selected from the group consisting of TaSb, CSb, SbN, TaNi, TaCu and TaRu, the absorber comprising the first layer and second layer providing a tunable phase shift and reflectance.