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Development of large-area dislocation detection and classification techniques for next-generation power semiconductor beta-Ga2O3

Research Project

Project/Area Number 20K05355
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 30010:Crystal engineering-related
Research InstitutionJapan Fine Ceramics Center

Principal Investigator

Yao Yongzhao  一般財団法人ファインセラミックスセンター, 材料技術研究所, 主任研究員 (80523935)

Co-Investigator(Kenkyū-buntansha) 石川 由加里  一般財団法人ファインセラミックスセンター, その他部局等, 主幹研究員 (60416196)
菅原 義弘  一般財団法人ファインセラミックスセンター, その他部局等, 上級研究員 (70466291)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsパワーデバイス / 酸化ガリウム / 結晶格子欠陥 / 転位 / エッチピット / 放射光X線トポグラフィー / Ga2O3 / 結晶欠陥 / X線トポグラフィー / 異常透過 / 曲率半径 / X線回折 / バーガースベクトル
Outline of Research at the Start

β型酸化ガリウム(β-Ga2O3)は、SiCやGaNを凌駕する超高耐圧・低損失のパワーデバイス用半導体材料として期待されているが、結晶中の転位に起因するデバイスの性能劣化が懸念される。本研究では、非破壊の手法である放射光X線トポグラフィを用い、β-Ga2O3の単結晶基板またはエピタキシャル膜に含まれる転位を全数検出した上で、バーガースベクトルで正確に分類する手法を開発し、β-Ga2O3単結晶に存在する全ての転位種類を明らかにする。

Outline of Final Research Achievements

Power devices based on β-type gallium oxide (β-Ga2O3), hereinafter referred to as β-Ga2O3, are expected to be the next-generation high-voltage and energy-efficient semiconductor for power conversion and control in various fields such as power infrastructure, railways, and automobiles. However, the current state of β-Ga2O3 crystals, which are the raw material for these devices, contains high-density linear lattice defects called dislocations, which significantly degrade the performance and reliability of the devices compared to the theoretical values of the material. This study focuses on the establishment of a technique to detect and classify dislocations in large-area single crystals for dislocation reduction. We have developed dislocation visualization techniques primarily based on a low-cost and simple etch pit defect detection method and non-destructive, high-precision synchrotron X-ray topography.

Academic Significance and Societal Importance of the Research Achievements

本研究で確立した転位検出分類技術を利用することにより、β-Ga2O3結晶内の転位の空間分布や転位の種類に関する情報を精確に把握できるため、結晶成長条件の最適化に的確なフィードバックを提供することが可能となる。また、転位分布とデバイス特性との相関解析を行うことで、転位のデバイスに及ぼす影響とその機構を解明できる。β-Ga2O3パワーデバイスの普及に向けて、結晶の高品質化の一層の加速が期待される。従来のシリコン半導体から高性能・高信頼性のβ-Ga2O3半導体に移行することで、電力変換と制御の高効率化が進み、地球温暖化の要因である温室効果ガスの排出が抜本的に削減される。

Report

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

    (19 results)

All 2023 2022 2021 2020 2019

All Journal Article (13 results) (of which Peer Reviewed: 13 results,  Open Access: 3 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] X-ray topographic observation of dislocations in β-Ga2O3 Schottky barrier diodes and their glide and multiplication under reverse bias2023

    • Author(s)
      Yao Yongzhao、Wakimoto Daiki、Miyamoto Hironobu、Sasaki Kohei、Kuramata Akito、Hirano Keiichi、Sugawara Yoshihiro、Ishikawa Yukari
    • Journal Title

      Scripta Materialia

      Volume: 226 Pages: 115216-115216

    • DOI

      10.1016/j.scriptamat.2022.115216

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Lattice misorientation at domain boundaries in β‐Ga<sub>2</sub>O<sub>3</sub> single‐crystal substrates observed via synchrotron radiation X‐ray diffraction imaging and X‐ray reticulography2023

    • Author(s)
      Yao Yongzhao、Hirano Keiichi、Sasaki Kohei、Kuramata Akito、Sugawara Yoshihiro、Ishikawa Yukari
    • Journal Title

      Journal of the American Ceramic Society

      Volume: 未定(In press) Issue: 9 Pages: 5487-5500

    • DOI

      10.1111/jace.19156

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Large-area total-thickness imaging and Burgers vector analysis of dislocations in <b><i>β</i></b>-Ga<sub>2</sub>O<sub>3</sub> using bright-field x-ray topography based on anomalous transmission2022

    • Author(s)
      Yao Yongzhao、Tsusaka Yoshiyuki、Sasaki Kohei、Kuramata Akito、Sugawara Yoshihiro、Ishikawa Yukari
    • Journal Title

      Applied Physics Letters

      Volume: 121 Issue: 1 Pages: 012105-012105

    • DOI

      10.1063/5.0098942

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Domain boundaries in ScAlMgO<sub>4</sub> single crystal observed by synchrotron radiation x-ray topography and reticulography2022

    • Author(s)
      Yao Yongzhao、Hirano Keiichi、Sugawara Yoshihiro、Ishikawa Yukari
    • Journal Title

      Semiconductor Science and Technology

      Volume: 37 Issue: 11 Pages: 115009-115009

    • DOI

      10.1088/1361-6641/ac974b

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Three-dimensional curving of crystal planes in wide bandgap semiconductor wafers visualized using a laboratory X-ray diffractometer2022

    • Author(s)
      Yao Yongzhao、Sato Koji、Sugawara Yoshihiro、Okada Narihito、Tadatomo Kazuyuki、Sasaki Kohei、Kuramata Akito、Ishikawa Yukari
    • Journal Title

      Journal of Crystal Growth

      Volume: 583 Pages: 126558-126558

    • DOI

      10.1016/j.jcrysgro.2022.126558

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Etch pit formation on β-Ga2O3 by molten KOH+NaOH and hot H3PO4 and their correlation with dislocations2022

    • Author(s)
      Yao Yongzhao、Sugawara Yoshihiro、Sato Koji、Yokoe Daisaku、Sasaki Kohei、Kuramata Akito、Ishikawa Yukari
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 910 Pages: 164788-164788

    • DOI

      10.1016/j.jallcom.2022.164788

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Observation of dislocations in thick β-Ga2O3 single-crystal substrates using Borrmann effect synchrotron X-ray topography2022

    • Author(s)
      Yao Yongzhao、Hirano Keiichi、Sugawara Yoshihiro、Sasaki Kohei、Kuramata Akito、Ishikawa Yukari
    • Journal Title

      APL Materials

      Volume: 10 Issue: 5

    • DOI

      10.1063/5.0088701

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Visualization of the curving of crystal planes in β-Ga2O3 by X-ray topography2021

    • Author(s)
      Yao Yongzhao、Hirano Keiichi、Takahashi Yumiko、Sugawara Yoshihiro、Sasaki Kohei、Kuramata Akito、Ishikawa Yukari
    • Journal Title

      Journal of Crystal Growth

      Volume: 576 Pages: 126376-126376

    • DOI

      10.1016/j.jcrysgro.2021.126376

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Anisotropic radius of curvature of crystal planes in wide-bandgap semiconductor wafers measured by X-ray diffraction2021

    • Author(s)
      Yao Yongzhao、Sugawara Yoshihiro、Yokoe Daisaku、Hirano Keiichi、Okada Narihito、Tadatomo Kazuyuki、Sasaki Kohei、Kuramata Akito、Ishikawa Yukari
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: 12 Pages: 128004-128004

    • DOI

      10.35848/1347-4065/ac3a20

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] X-ray topography of crystallographic defects in wide-bandgap semiconductors using a high-resolution digital camera2021

    • Author(s)
      Yao Yongzhao、Sugawara Yoshihiro、Ishikawa Yukari、Hirano Keiichi
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: 1 Pages: 010908-010908

    • DOI

      10.35848/1347-4065/abd2dd

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Dislocation classification of a large-area β-Ga2O3 single crystal via contrast analysis of affine-transformed X-ray topographs2020

    • Author(s)
      Yao Yongzhao、Ishikawa Yukari、Sugawara Yoshihiro
    • Journal Title

      Journal of Crystal Growth

      Volume: 548 Pages: 125825-125825

    • DOI

      10.1016/j.jcrysgro.2020.125825

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Slip planes in monoclinic β-Ga2O3 revealed from its {010} face via synchrotron X-ray diffraction and X-ray topography2020

    • Author(s)
      Yao Yongzhao、Ishikawa Yukari、Sugawara Yoshihiro
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 59 Issue: 12 Pages: 125501-125501

    • DOI

      10.35848/1347-4065/abc1aa

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] X-ray diffraction and Raman characterization of β-Ga2O3 single crystal grown by edge-defined film-fed growth method2019

    • Author(s)
      Yao, Yongzhao, Sugawara, Yoshihiro, Yukari, Ishikawa,Takahashi, Yumiko, Hirano, Keiichi
    • Journal Title

      Journal of Applied Physics

      Volume: 126 Issue: 20 Pages: 205110-205110

    • DOI

      10.1063/5.0007229

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Structural defects in β-Ga2O3 analyzed by X-ray topography and complementary techniques2022

    • Author(s)
      Y. Yao, Y. Sugawara, K. Sato, D. Yokoe, Y. Ishikawa, D. Wakimoto, H. Miyamoto, K. Sasaki, A. Kuramata
    • Organizer
      The 19th International Conference on Defects-Recognition, Imaging and Physics in Semiconductors (DRIP19)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Dislocation analysis for large-area thick EFG β-Ga2O3 substrates using Borrmann effect synchrotron X-ray topography2022

    • Author(s)
      Y. Yao, Y. Tsusaka, K. Hirano, K. Sasaki, A. Kuramata, Y. Sugawara, Y. Ishikawa
    • Organizer
      The International Workshop on Gallium Oxide and Related Materials (IWGO)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Operando and ex-situ XRT observation of dislocations in β-Ga2O3 SBDs and their glide and multiplication under device operation2022

    • Author(s)
      Y. Yao, D. Wakimoto, H. Miyamoto, K. Sasaki, A. Kuramata, K. Hirano, Y. Sugawara, Y. Ishikawa
    • Organizer
      The International Workshop on Gallium Oxide and Related Materials (IWGO)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] X線回折によるパワー半導体単結晶基板の結晶面湾曲の3D可視化2022

    • Author(s)
      姚永昭
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Evaluation of β-Ga2O3 substrates using X-ray diffraction, synchrotron X-ray topography, and etch pit method2021

    • Author(s)
      姚永昭
    • Organizer
      結晶加工と評価技術 第145委員会 第173回研究会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Patent(Industrial Property Rights)] 半導体基板の結晶面の形状評価方法および形状評価装置、ならびに、半導体基板の結晶面の形状評価を行うためのコンピュータプログラム2021

    • Inventor(s)
      姚永昭、石川由加里、菅原義弘
    • Industrial Property Rights Holder
      姚永昭、石川由加里、菅原義弘
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2021-148810
    • Filing Date
      2021
    • Related Report
      2021 Research-status Report

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

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