Invention Grant
- Patent Title: Reflective photomask and production method therefor
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Application No.: US15057548Application Date: 2016-03-01
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Publication No.: US09927692B2Publication Date: 2018-03-27
- Inventor: Genta Watanabe , Tomohiro Imoto , Norihito Fukugami
- Applicant: Toppan Printing Co., Ltd.
- Applicant Address: JP Tokyo
- Assignee: TOPPAN PRINTING CO., LTD.
- Current Assignee: TOPPAN PRINTING CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Foley & Lardner, LLP
- Priority: JP2013-185324 20130906
- Main IPC: G03F1/24
- IPC: G03F1/24 ; G03F1/22

Abstract:
A reflective photomask includes: a substrate; a multilayer reflection film formed on the substrate and reflecting exposure light including light with a wavelength of about 5 nm to 15 nm for lithography; an absorption film formed on the multilayer reflection film and absorbing the exposure light, and formed therein with a circuit pattern or a circuit pattern forming region where the circuit pattern is formed; a shading region formed by removing part of the multilayer reflection film and the absorption film on the substrate, on an outer peripheral side of the circuit pattern or the circuit pattern forming region to shade part of the exposure light reflected by the multilayer reflection film; and a plurality of projections formed at a pitch of about 3000 nm or less on part of a surface of the substrate exposed in the shading region, and suppressing reflection of out-of-band light with a wavelength of about 140 nm to 800 nm included in the exposure light and incident on the shading region.
Public/Granted literature
- US20160178997A1 REFLECTIVE PHOTOMASK AND PRODUCTION METHOD THEREFOR Public/Granted day:2016-06-23
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