Invention Grant
- Patent Title: Method of manufacturing silicon carbide semiconductor device including forming an electric field control region by a laser doping technology
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Application No.: US15067115Application Date: 2016-03-10
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Publication No.: US09825145B2Publication Date: 2017-11-21
- Inventor: Koh Yoshikawa , Haruo Nakazawa , Kenichi Iguchi , Yasukazu Seki
- Applicant: FUJI ELECTRIC CO., LTD.
- Applicant Address: JP Kanagawa
- Assignee: FUJI ELECTRIC CO., LTD.
- Current Assignee: FUJI ELECTRIC CO., LTD.
- Current Assignee Address: JP Kanagawa
- Priority: JP2015-089132 20150424
- Main IPC: H01L21/04
- IPC: H01L21/04 ; H01L21/268 ; H01L29/16 ; H01L29/872 ; H01L29/47 ; H01L29/06 ; H01L29/66 ; H01L29/167

Abstract:
When p-type impurities are implanted into a SiC substrate using a laser, controlling the concentration is difficult. A p-type impurity region is formed by a laser in a region where the control of the concentration in the SiC substrate is not necessary almost at all. A SiC semiconductor device having withstanding high voltage is manufactured at a lower temperature process compared to ion implantation process. A method of manufacturing a silicon carbide semiconductor device includes forming, on one main surface of a first conductivity-type silicon carbide substrate, a first conductivity-type drift layer having a lower concentration than that of the silicon carbide substrate; forming, on a front surface side of the drift layer, a second conductivity-type electric field control region by a laser doping technology; forming a Schottky electrode in contact with the drift layer; and forming, on the other main surface of the silicon carbide substrate, a cathode electrode.
Public/Granted literature
- US20160315169A1 METHOD OF MANUFACTURING SILICON CARBIDE SEMICONDUCTOR DEVICE Public/Granted day:2016-10-27
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