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YAGI Shuhei
Mathematics, Electronics and Informatics DivisionAssociate Professor
Department of Electrical Engineering,Electronics, and Applied Physics

Researcher information

■ Degree
  • Master of Engineering, Tokyo Institute of Technology
■ Research Keyword
  • High Efficiency Solar Cells
  • Crystal Growth
  • Semiconductor Engineering
■ Field Of Study
  • Natural sciences, Semiconductors, optical and atomic physics, Semiconductor engineering
  • Nanotechnology/Materials, Crystal engineering, Crystal growth
  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Electric/electronic material engineering
■ Career
  • Apr. 2015 - Present, Saitama University, Graduate School of Science and Engineering, Associate Professor
  • Apr. 2010 - Mar. 2015, Saitama Univeristy, Graduate School of Science and Engineering, Assistant Professor
  • Apr. 2009 - Mar. 2010, The University of Tokyo, Research Center for Advanced Science and Technology, Project Assistant Professor
  • Apr. 2008 - Mar. 2009, The University of Tokyo, Research Center for Advanced Science and Technology, Project Research Fellow
  • May 2007 - Mar. 2008, Tsukuba University, Institute of Applied Physics, Reserch Fellow
  • Apr. 2007 - Apr. 2007, Tsukuba University, Institute of Applied Physics
  • Apr. 2006 - Mar. 2007, National Institute for Materials Science, NIMS postdoc research fellow
  • Apr. 2004 - Mar. 2006, National Institute for Materials Science, Research Fellow
■ Educational Background
  • Apr. 2001 - Mar. 2004, Tokyo Institute of Technology, Graduate School, Division of Science and Engineering, Department of Physical Electronics
  • Apr. 1999 - Mar. 2001, Tokyo Insititute of Technology, Graduate School, Division of Science and Engineering, Department of Physical Electronics, Japan
  • Apr. 1997 - Mar. 1999, The University of Electro-Communications, Faculty of Electro Communications, Department of Electronics, Japan
  • Apr. 1992 - Mar. 1997, Tokyo National College of Technology, Japan
■ Member History
  • Nov. 2024 - Present
    Society
  • Apr. 2020 - Present
    The Japan Society of Applied Physics, APEX/JJAP Editor, Society
  • Jun. 2012 - Sep. 2018
    Society
  • Nov. 2017 - Apr. 2018
    JJAP special issue (PVSEC-27), JJAP special issue guest editor (PVSEC-27), Society
  • Jun. 2017 - Nov. 2017
    Society
  • Nov. 2014 - Apr. 2015
    JJAP special issue (WCPEC-6), JJAP special issue guest editor (WCPEC-6), Society
  • Jun. 2014 - Nov. 2014
    Society
  • Dec. 2010 - Oct. 2011
    Society
■ Award
  • Mar. 2025, 応用物理学会論文誌編集貢献賞

Performance information

■ Paper
■ MISC
■ Books and other publications
  • 超高効率太陽電池・関連材料の最前線(荒川康彦 監修)               
    八木 修平, [Contributor]
■ Teaching experience
  • Oct. 2020 - Present
    Electrical Circuit, Saitama University
  • Apr. 2020 - Sep. 2021
    理工学と現代社会
■ Affiliated academic society
  • Oct. 2020 - Present, The Japan Photovoltaic Society
■ Research projects
  • Improvement of the efficiency of photovoltaic cells using two-step optical absorption through band tail states               
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 01 Apr. 2024 - 31 Mar. 2027
    Saitama University
    Grant amount(Total):4550000, Direct funding:3500000, Indirect funding:1050000
    Grant number:24K07574
  • A novel stacked structure of intermediate band cells for higher efficiency               
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), 01 Apr. 2022 - 31 Mar. 2025
    Saitama University
    Grant amount(Total):4160000, Direct funding:3200000, Indirect funding:960000
    Grant number:22K04211
    論文ID:49117072
  • 希釈窒化物混晶による超高効率中間バンドタンデム太陽電池の研究               
    Apr. 2018 - Mar. 2020
    Principal investigator
    Competitive research funding
  • 希釈窒化物半導体による高効率マルチバンド太陽電池の研究               
    Apr. 2016 - Mar. 2019
    Principal investigator
    Competitive research funding
  • Study on the Behavior of Defects in Dilute Nitride Semiconductors and Improvement of Device Reliability               
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 01 Apr. 2014 - 31 Mar. 2017
    Ueda Osamu; IKENAGA NORIAKI; YAGI SHUHEI, Kanazawa Institute of Technology
    Grant amount(Total):5070000, Direct funding:3900000, Indirect funding:1170000
    In order to clarify degradation mechanism of optical devices fabricated from dilute nitride semiconductors such as GaInNAs, grown-in defects were characterized by transmission electron microscopy, and generation and multiplication of defects in the crystals under laser irradiation were investigated.
    It has been shown that defects such as point defect clusters and dislocation loops are not generated in as-grown GaInNAs crystals. Furthermore, in the case of laser irradiation of GaInNAs/GaAs SQW structure, we have found that the emission efficiency increased for lower laser power density and that the emission efficiency drastically increased then decreased for higher power density. In both cases, no structural defects were newly generated by the laser irradiation. Further increase in the laser power density is required for detailed investigation of the degradation mechanism.
    Grant number:26390057
  • 窒化物半導体ナノ構造中のホットキャリアを利用する新型太陽電池に関する研究               
    Dec. 2014 - Nov. 2015
    Principal investigator
    Competitive research funding
  • 局所ドーピング構造半導体による量子相関光子の生成および制御               
    Apr. 2012 - Mar. 2015
    Competitive research funding
  • 窒化物量子ドット太陽電池の開発               
    Nov. 2012 - Oct. 2013
    Principal investigator
    Competitive research funding
  • 局所ドーピング構造半導体による単一光子発生に関する研究               
    Apr. 2009 - Mar. 2011
    Competitive research funding
  • ‐               
    Competitive research funding
  • -               
    Competitive research funding
■ Industrial Property Rights
  • 光起電力素子及びその製造方法               
    Patent right
    Patent/Registration no:特許第5841231号
    J-Global ID:201603019885568991
  • 光起電力素子及びその製造方法               
    Patent right
    J-Global ID:201503010382867768
  • 光検出素子及び光検出方法               
    Patent right
    J-Global ID:201303058776438657
  • 可逆光応答素子を用いた並列アナログ演算装置               
    Patent right
    Patent/Registration no:特許第5236173号
    J-Global ID:201303078366538698
  • 半導体とその製造方法               
    Patent right
    Patent/Registration no:特許第5187761号
    J-Global ID:201303069665849951
  • 光透過フィルタを用いた画像出力装置及び並列アナログ演算装置               
    Patent right
    Patent/Registration no:特許第5121198号
    J-Global ID:201303003170113079
  • 可逆光応答素子並びにそれを用いた撮像装置及び並列アナログ演算装置               
    Patent right
    J-Global ID:200903049895238508
  • 光透過フィルタ並びにそれを用いた画像出力装置及び並列アナログ演算装置               
    Patent right
    J-Global ID:200903083194405497
  • 半導体とその製造方法               
    Patent right
    J-Global ID:201003020026758820
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