Invention Grant
- Patent Title: Mask blank, transfer mask and methods of manufacturing the same
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Application No.: US14892260Application Date: 2014-05-19
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Publication No.: US10365555B2Publication Date: 2019-07-30
- Inventor: Hiroaki Shishido , Osamu Nozawa , Ryo Ohkubo
- Applicant: HOYA CORPORATION
- Applicant Address: JP Tokyo
- Assignee: HOYA CORPORATION
- Current Assignee: HOYA CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2013-109386 20130523
- International Application: PCT/JP2014/063222 WO 20140519
- International Announcement: WO2014/189004 WO 20141127
- Main IPC: G03F1/30
- IPC: G03F1/30 ; G03F1/32 ; C23G5/00 ; G03F1/80

Abstract:
In a mask blank having a structure in which a light-semitransmissive film and a light-shielding film are laminated on a main surface of a transparent substrate, the light-semitransmissive film is made of a material that can be dry-etched with an etching gas containing a fluorine-based gas, the light-shielding film is made of a material that contains tantalum and one or more elements selected from hafnium and zirconium and contains no oxygen except in a surface layer thereof, an etching stopper film is provided between the light-semitransmissive film and the light-shielding film, and the etching stopper film is made of a material that contains chromium with an oxygen content of 20 at % or less.
Public/Granted literature
- US20160202602A1 MASK BLANK, TRANSFER MASK AND METHODS OF MANUFACTURING THE SAME Public/Granted day:2016-07-14
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