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Low-temperature direct bonding of beta-Ga2O3/diamond for advanced power electronics

Research Project

Project/Area Number 20K15044
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 26030:Composite materials and interfaces-related
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Matsumae Takashi  国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 研究員 (10807431)

Project Period (FY) 2020-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords酸化ガリウム / ダイヤモンド / 直接接合 / 放熱構造 / pnジャンクション / Ga2O3 / パワー半導体 / ウルトラワイドギャップ / 放熱基板 / 低温接合
Outline of Research at the Start

省エネルギー社会のため高性能β-Ga2O3パワー半導体の実現が期待されるが、β-Ga2O3の放熱効率の悪さが実用化の課題となっている。本研究ではβ-Ga2O3デバイス基板を物質中最高の熱伝達率を持つダイヤモンド放熱基板と直接接合することで放熱効率の良好化を試みる。界面物性評価・条件最適化を通して、優れた特性を有するβ-Ga2O3/ダイヤモンド直接接合構造を実現する。

Outline of Final Research Achievements

Gallium Oxide (Ga2O3) is regarded as a future power electronics material but has a low thermal conductivity. For the efficient heat dissipation for the Ga2O3 power device, we have developed the direct bonding technique between Ga2O3 and diamond substrates. The thickness of the amorphous layer at the Ga2O3/diamond interface was less than 1 nm. The thermal resistance of the Ga2O3/diamond hetero-structure was reduced than the conventional Ga2O3 substrate. In addition, the rectification property was demonstrated by using the direct bonded n-Ga2O3/p-diamond interface.

Academic Significance and Societal Importance of the Research Achievements

今回実施が容易という特徴をもつ大気中での直接接合を採用した。Siなどの既存の半導体材料の直接接合では接合界面に酸化物の障壁層ができていたが、酸化物である酸化ガリウムと、表面酸化層ができないダイヤモンドの間では上記障壁層が数原子レベルまで抑制できることが分かった。これにより酸化ガリウムからなるパワー半導体からダイヤモンド放熱基板への理想的な放熱が期待され、新しい省エネデバイスの実現が期待できる。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (8 results)

All 2022 2021 2020

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Diamond/β-Ga2O3 pn heterojunction diodes fabricated by low-temperature direct-bonding2021

    • Author(s)
      Sittimart Phongsaphak、Ohmagari Shinya、Matsumae Takashi、Umezawa Hitoshi、Yoshitake Tsuyoshi
    • Journal Title

      AIP Advances

      Volume: 11 Issue: 10 Pages: 105114-105114

    • DOI

      10.1063/5.0062531

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Heterogeneous direct bonding of diamond and semiconductor substrates using NH3/H2O2 cleaning2021

    • Author(s)
      Fukumoto Shoya、Matsumae Takashi、Kurashima Yuichi、Takagi Hideki、Umezawa Hitoshi、Hayase Masanori、Higurashi Eiji
    • Journal Title

      Applied Physics Letters

      Volume: 117 Issue: 20 Pages: 201601-201601

    • DOI

      10.1063/5.0026348

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Low-temperature direct bonding of diamond (100) substrate on Si wafer under atmospheric conditions2021

    • Author(s)
      Matsumae Takashi、Kurashima Yuichi、Takagi Hideki、Umezawa Hitoshi、Higurashi Eiji
    • Journal Title

      Scripta Materialia

      Volume: 191 Pages: 52-55

    • DOI

      10.1016/j.scriptamat.2020.09.006

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Hetero-integration of β-Ga2O3 and Diamond substrates by hydrophilic bonding technique2020

    • Author(s)
      Takashi Matsumae, Yuichi Kurashima, Hideki Takagi, Hitoshi Umezawa, Koji Tanaka, Toshimitsu Ito, Hideyuki Watanabe and Eiji Higurashi
    • Journal Title

      ECS Trans.

      Volume: 98 Issue: 4 Pages: 17-20

    • DOI

      10.1149/09804.0017ecst

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] Efficient heat dissipation from β-Ga2O3 film directly bonded on diamond substrate2022

    • Author(s)
      T. Matsumae, Y. Kurashima, H. Takagi, H. Umezawa, H. Watanabe, T. Ito, E. Higurashi
    • Organizer
      2022 International Conference on Electronics Packaging (ICEP 2022)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 福本将也 ,松前貴司,倉島優一,高木秀樹,梅沢仁,早瀬仁則,日暮栄治2021

    • Author(s)
      NH3/H2O2洗浄処理した Si とダイヤモンド基板の直接接合
    • Organizer
      2020 年度精密工学会秋季大会学術講演会講演論文集
    • Related Report
      2021 Annual Research Report
  • [Presentation] Hetero-Integration of β-Ga2O3 and Diamond Substrates by Hydrophilic Bonding Technique2020

    • Author(s)
      Takashi Matsumae, Yuichi Kurashima, HIdeki Takagi, Hitoshi Umezawa, Koji Tanaka, Toshimitsu Ito, Hidekyuki Watanabe, Eiji Higurashi
    • Organizer
      Pacific Rim Meeting on Electrochemical and Solid State Science 2020 (PRiME 2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] β-Ga2O3薄膜とダイヤモンド基板の低温直接接合2020

    • Author(s)
      松前 貴司, 倉島 優一, 高木 秀樹, 梅沢 仁, 田中 孝治, 伊藤 利充, 渡邊 幸志, 日暮 栄治
    • Organizer
      2020年度精密工学会 秋季大会学術講演会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2023-01-30  

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