Patent ID: 11860529
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. A manufacturing method for the substrate with a multilayer reflection film for an EUV mask blank of claim 1 comprising a substrate, and a multilayer reflection film formed on the substrate, the multilayer reflection film comprising a Si/Mo laminated portion in which Si layers and Mo layers are alternately laminated, and a protection layer containing Ru formed on the Si/Mo laminated portion and in contact with the Si/Mo laminated portion,
the method comprising the steps of
(A) forming the Si/Mo laminated portion by sputtering, and
(B) forming the protection layer by sputtering, wherein
after the step (A), the Mo/Si laminated portion is provided to the step (B) without contacting to gases reactable to the Mo/Si laminated portion that has been formed in the step (A).