Invention Grant
- Patent Title: Method for producing SiC epitaxial wafer including forming epitaxial layer under different conditions
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Application No.: US16063911Application Date: 2016-12-12
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Publication No.: US10774444B2Publication Date: 2020-09-15
- Inventor: Daisuke Muto , Akira Miyasaka
- Applicant: SHOWA DENKO K.K.
- Applicant Address: JP Tokyo
- Assignee: SHOWA DENKO K.K.
- Current Assignee: SHOWA DENKO K.K.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@2261749d
- International Application: PCT/JP2016/086895 WO 20161212
- International Announcement: WO2017/110550 WO 20170629
- Main IPC: C30B25/16
- IPC: C30B25/16 ; C30B29/36 ; H01L21/02 ; C30B25/18 ; C23C16/32 ; C23C16/455 ; C30B25/20

Abstract:
This method of producing a SiC epitaxial wafer having an epitaxial layer on a SiC single crystal substrate, and includes: when performing crystal growth of the epitaxial layer, a step of forming a part of an epitaxial layer under first conditions at an initial stage where the crystal growth is started; and a step of forming a part of a SiC epitaxial layer under second conditions in which a Cl/Si ratio is decreased and a C/Si ratio is increased in comparison to those in the first conditions, wherein the C/Si ratio is equal to or less than 0.6 and the Cl/Si ratio is equal to or more than 5.0 in the first conditions.
Public/Granted literature
- US20180371641A1 METHOD FOR PRODUCING SIC EPITAXIAL WAFER Public/Granted day:2018-12-27
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