Invention Grant
- Patent Title: Method for producing substrate with multilayer reflective film, method for producing reflective mask blank and method for producing reflective mask
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Application No.: US14369414Application Date: 2013-03-21
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Publication No.: US09229316B2Publication Date: 2016-01-05
- Inventor: Tsutomu Shoki , Kazuhiro Hamamoto
- Applicant: HOYA CORPORATION
- Applicant Address: JP Tokyo
- Assignee: HOYA CORPORATION
- Current Assignee: HOYA CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2012-073220 20120328
- International Application: PCT/JP2013/057950 WO 20130321
- International Announcement: WO2013/146488 WO 20131003
- Main IPC: G03F1/24
- IPC: G03F1/24 ; G03F1/42

Abstract:
Disclosed is a method for producing a substrate with a multilayer reflective film for EUV lithography including a multilayer reflective film disposed on a principal surface of a substrate, the method including a multilayer reflective film formation step of forming the multilayer reflective film on the principal surface of the substrate in such a manner that the multilayer reflective film has a slope region in which the film thickness is decreased in a direction from the inside to the outside of the substrate on a peripheral portion of the principal surface, and a fiducial mark formation step of forming fiducial marks in the slope region by removing at least a portion of the multilayer reflective film, the fiducial marks serving as references for a defective location indicated by defect information with respect to the surface of the substrate with the multilayer reflective film.
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