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Layered metallic material/semiconductor heterostructures for harsh-environment electronics

Research Project

Project/Area Number 20H02611
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 29020:Thin film/surface and interfacial physical properties-related
Research InstitutionNational Institute for Materials Science (2021-2022)
Tohoku University (2020)

Principal Investigator

HARADA Takayuki  国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, 独立研究者 (90609942)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
Keywords薄膜 / 界面 / 酸化物 / ヘテロ構造 / 半導体 / 電気特性 / デバイス / スパッタリング / 薄膜ヘテロ構造 / 層状物質 / 物性 / 高温エレクトロニクス
Outline of Research at the Start

これまで、半導体デバイスは室温・大気中で用いられることが前提だった。一方で、IoT社会では半導体デバイスは様々な環境下で動作することが求められる。例えば、電気自動車、工業プラントのセンサーや制御系では、半導体デバイスは数100℃の高温下に置かれる。海底や地中などの自然環境では、腐食せず長期間動作しなければならない。原子炉や航空宇宙用途では強力な放射線に曝される。現在主流のシリコンデバイスは、200℃以上では熱暴走によって動作できない。本研究では、酸化物と半導体の結晶界面を用いて過酷な環境で動作できるデバイスの開発を行う。

Outline of Final Research Achievements

We have thin film growth by sputtering and application to semiconductor devices, focusing on the high electrical conductivity and surface polarization of metallic delafossites. We have fabricated a high-speed Schottky diode with wide-gap semiconductor Ga2O3. In addition, we succeeded in growing a thin film of a representative metallic delafossite PdCoO2 by a sputtering technique.

Academic Significance and Societal Importance of the Research Achievements

金属性デラフォサイト型酸化物とGa2O3を接合し、350℃で逆回復時間11nsで動作するショットキーダイオードを作製した。高温で高速動作が求められるパワーエレクトロニクスなどへの応用が期待できる優れた特性を実証することができた。半導体デバイスへの応用には金属性デラフォサイト型酸化物の大面積薄膜を作製する方法が必要である。本研究ではスケールアップに適したスパッタリング法を用いて、金属性デラフォサイト型酸化物を作製することに成功した。これらは、応用研究に繋がる成果だと位置づけている。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (18 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (11 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 10 results,  Open Access: 4 results) Presentation (2 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results) Patent(Industrial Property Rights) (1 results)

  • [Int'l Joint Research] Max Planck Institute(ドイツ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] CNRS(フランス)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Max Planck Institute(ドイツ)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] CNRS/Thales(フランス)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Sputter-grown c-axis-oriented PdCoO2 thin films2023

    • Author(s)
      T. Harada , T. Nagai , M. Oishi , Y. Masahiro
    • Journal Title

      Journal of Applied Physics

      Volume: 133 Issue: 8 Pages: 085302-085302

    • DOI

      10.1063/5.0136749

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Visualization of robust two-dimensional bulk states with suppressed surface state on epitaxial PdCoO2 thin films with bipolar surfaces2023

    • Author(s)
      Tomoki Kawamoto , Anjana Krishnadas , Chia-Hsiu Hsu , Markel Pardo-Almanza , Yuita Fujisawa , Guoqing Chang , Takayuki Harada , Yoshinori Okada
    • Journal Title

      Physical Review Materials

      Volume: 7 Issue: 2 Pages: 024001-024001

    • DOI

      10.1103/physrevmaterials.7.024001

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Surface and interface properties of quasi-two dimensional metallic oxides2022

    • Author(s)
      原田 尚之
    • Journal Title

      Oyo Buturi

      Volume: 91 Issue: 7 Pages: 406-410

    • DOI

      10.11470/oubutsu.91.7_406

    • ISSN
      0369-8009, 2188-2290
    • Year and Date
      2022-07-01
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Surface and interface properties of quasi-two-dimensional metallic oxides2022

    • Author(s)
      Takayuki Harada
    • Journal Title

      JSAP Review

      Volume: 2022 Issue: 0 Pages: n/a

    • DOI

      10.11470/jsaprev.220303

    • ISSN
      2437-0061
    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Metallic delafossite thin films for unique device applications2022

    • Author(s)
      Takayuki Harada, Yoshinori Okada
    • Journal Title

      APL Materials

      Volume: 10 Issue: 7 Pages: 070902-070902

    • DOI

      10.1063/5.0097269

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Determination of the phase coherence length of PdCoO2 nanostructures by conductance fluctuation analysis2021

    • Author(s)
      Harada T.、Bredol P.、Inoue H.、Ito S.、Mannhart J.、Tsukazaki A.
    • Journal Title

      Physical Review B

      Volume: 103 Issue: 4 Pages: 045123-045123

    • DOI

      10.1103/physrevb.103.045123

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Thin-film growth and application prospects of metallic delafossites2021

    • Author(s)
      Takayuki Harada
    • Journal Title

      Materials Today Advances

      Volume: 11 Pages: 100146-100146

    • DOI

      10.1016/j.mtadv.2021.100146

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nonreciprocal Transport in a Rashba Ferromagnet, Delafossite PdCoO22021

    • Author(s)
      Jin Hong Lee, Takayuki Harada, Felix Trier, Lourdes Marcano, Florian Godel, Sergio Valencia, Atsushi Tsukazaki, Manuel Bibes
    • Journal Title

      Nano Letters

      Volume: 21 Issue: 20 Pages: 8687-8692

    • DOI

      10.1021/acs.nanolett.1c02756

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Thin-film growth and application prospects of metallic delafossites2021

    • Author(s)
      Harada T.
    • Journal Title

      Materials Today Advances

      Volume: -

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dynamic characteristics of PdCoO2/β-Ga2O3 Schottky junctions2020

    • Author(s)
      Harada T.、Tsukazaki A.
    • Journal Title

      Applied Physics Letters

      Volume: 116 Issue: 23 Pages: 232104-232104

    • DOI

      10.1063/5.0008137

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Inhomogeneous interface dipole effect at the Schottky junctions of PdCrO2 on β-Ga2O3 ( 2  ̄ 01 ) substrates2020

    • Author(s)
      Miyakawa T.、Harada T.、Ito S.、Tsukazaki A.
    • Journal Title

      Journal of Applied Physics

      Volume: 128 Issue: 2 Pages: 025302-025302

    • DOI

      10.1063/5.0011783

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] Polar interfaces of a high-conductivity layered oxide PdCoO2 and wide-bandgap semiconductors2022

    • Author(s)
      Takayuki Harada
    • Organizer
      9th International Symposium on Control of Semiconductor Interfaces
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Delafossite electrodes for harsh-environment semiconductor devices2021

    • Author(s)
      Takayuki Harada
    • Organizer
      The 12th International Conference on the Science and Technology for Advanced Ceramics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Patent(Industrial Property Rights)] パラジウムコバルト酸化物薄膜、デラフォサイト型酸化物薄膜、デラフォ サイト型酸化物薄膜を有するショットキー電極、パラジウムコバルト酸化物薄膜の製造方 法及びデラフォサイト型酸化物薄膜の製造方法2022

    • Inventor(s)
      原田 尚之 , 政広 泰
    • Industrial Property Rights Holder
      国立研究開発法人物質・材料研究機構、田中貴金属工業株式会社
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-111428
    • Filing Date
      2022
    • Related Report
      2022 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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