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Halide vapor phase epitaxy of epsilon-Ga2O3 for optical and power device applications

Research Project

Project/Area Number 17K05047
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Crystal engineering
Research InstitutionNational Institute for Materials Science

Principal Investigator

OSHIMA Yuichi  国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 主幹研究員 (70623528)

Co-Investigator(Kenkyū-buntansha) Garcia Villora  国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 主任研究員 (90421411)
島村 清史  国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, グループリーダー (90271965)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords酸化物半導体 / パワーデバイス / 紫外線検出素子 / ワイドギャップ半導体 / パワー半導体 / 酸化ガリウム / 結晶成長 / エピタキシャル
Outline of Final Research Achievements

We investigated HVPE of ε-Ga2O3 and basic properties of the grown films toward device applications. We confirmed that ε-Ga2O3 films grown on AlN or β-Ga2O3 substrates were thermally stable up to about 700°C as well as the case of a sample grown on GaN. It was found that the HVPE films included orthorhombic phase as a result of structural analysis. We clarified that the mosaicity of a flat ε-Ga2O3 film could be improved by increasing the growth temperature of the thickness. We carried out epitaxial lateral overgrowth (ELO) using dot-patterned SiO2 mask, and demonstrated the formation of isolated ε-Ga2O3 islands and their coalescence to produce a flat film. XRD-FWHMs of the ELO-grown samples were much smaller than those of conventionally grown flat films.

Academic Significance and Societal Importance of the Research Achievements

省エネルギー社会の実現に向け、GaNやSiCを超えるいわゆるウルトラワイドバンドギャップ半導体のパワーデバイス応用の実現が急務である。本研究のターゲットであるε-Ga2O3はその候補の一つであり、高濃度二次元電子ガスやそれを利用した高性能HEMTが期待できるユニークな特徴をもつ。しかしε-Ga2O3は準安定相であるうえに格子整合基板が無い。従って、まずはその物性の把握や結晶欠陥の低減が不可欠である。本研究において、ε-Ga2O3の熱的安定性や結晶構造の重要な知見が得られ、さらに選択成長による高品質化に世界で初めて成功したことは、ε-Ga2O3のデバイス応用実現に大きく寄与するものである。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (7 results)

All 2020 2019 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (4 results) (of which Int'l Joint Research: 1 results,  Invited: 4 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Phase-controlled epitaxial lateral overgrowth of α-Ga2O3 by halide vapor phase epitaxy2020

    • Author(s)
      Oshima Yuichi、Kawara Katsuaki、Oshima Takayoshi、Okigawa Mitsuru、Shinohe Takashi
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 59 Issue: 2 Pages: 025512-025512

    • DOI

      10.35848/1347-4065/ab6faf

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] ワイドギャップ半導体Ga2O3の安定相の制御2020

    • Author(s)
      大島祐一
    • Organizer
      第67回応用物理学会春季学術講演会シンポジウム「多様な安定相のエンジニアリングによる多元系材料開発の新展開 - 未来材料開拓イニシアチブ~環境・エネルギー材料の未来~」
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Halide Vapor Phase Epitaxy of Meta-Stable Ga2O32019

    • Author(s)
      Yuichi Oshima
    • Organizer
      The 3rd International Workshop on Gallium Oxide and Related Materials (IWGO-3)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 準安定相Ga2O3のハライド気相成長2019

    • Author(s)
      大島祐一
    • Organizer
      ワイドギャップ半導体光・電子デバイス第162委員会 第113回 研究会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 準安定相酸化ガリウムの ハライド気相成長2017

    • Author(s)
      大島祐一
    • Organizer
      第78回応用物理学会秋季学術講演会シンポジウム 「これからの未来を担う新ワイドギャップ酸化物材料Ga2O3」
    • Related Report
      2017 Research-status Report
    • Invited
  • [Patent(Industrial Property Rights)] 結晶性積層構造体および半導体装置2019

    • Inventor(s)
      大島祐一、河原克明、高橋勲、四戸孝
    • Industrial Property Rights Holder
      物質・材料研究機構、(株)FLOSFIA
    • Industrial Property Rights Type
      特許
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 結晶性積層構造体の製造方法2019

    • Inventor(s)
      大島祐一、河原克明、高橋勲、四戸孝
    • Industrial Property Rights Holder
      物質・材料研究機構、(株)FLOSFIA
    • Industrial Property Rights Type
      特許
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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