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Investigation of terahertz emission mechanism on gallium nitride and its application to evaluation method

Research Project

Project/Area Number 16H04330
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionOsaka University

Principal Investigator

Kawayama Iwao  大阪大学, レーザー科学研究所, 准教授 (10332264)

Research Collaborator Sakai Yuji  
Nakanishi Hidetoshi  
Tonouchi Masayoshi  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2017: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2016: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Keywordsテラヘルツ波 / ワイドギャップ半導体 / 窒化ガリウム / 分極 / イメージング / 酸化ガリウム / 欠陥・不純物 / 評価技術 / シリコンカーバイド / 不純物・欠陥 / 自発分極 / テラヘルツ放射
Outline of Final Research Achievements

We observed m-plane GaN in which spontaneous polarization exists in the c-axis direction using a laser terahertz radiation microscope (LTEM), and confirmed that the THz emission is enhanced by spontaneous polarization, and succeeded in specifying the inversion domain. We also passed the THz wave through two wire grid polarizers, rotated one wire grid by 90 degree, and obtained the distribution of the x and y components of the polarization of the THz wave, and combined these two polarization components to visualize the local polarization of the m-GaN surface. This technique makes it possible to image changes in polarization in the domain more clearly.

Academic Significance and Societal Importance of the Research Achievements

本研究では、次世代高速・省エネルギーパワーデバイス材料として期待されている窒化ガリウム結晶を、独自に開発したレーザーテラヘルツ放射顕微鏡を用いて観察し、観測されたTHz放射の波形・強度を分析することにより、従来手法では困難な、窒化ガリウム表面における格子欠陥・転位、不純物、および分極構造を評価することに成功した。これは、GaN結晶およびデバイスの品質向上に大きく貢献する成果である。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (15 results)

All 2018 2017 2016

All Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 2 results,  Acknowledgement Compliant: 1 results) Presentation (12 results) (of which Int'l Joint Research: 8 results,  Invited: 8 results)

  • [Journal Article] Control of dipole properties in high-k and SiO2 stacks on Si substrates with tricolor superstructure2018

    • Author(s)
      Hotta Yasushi, Kawayama Iwao, Miyake Shozo, Saiki Ikuya, Nishi Shintaro, Yamahara Kota, Arafune Koji, Yoshida Haruhiko, Satoh Shin-ichi, Sawamoto Naomi, Ogura Atsushi, Ito Akira, Nakanishi Hidetoshi, Tonouchi Masayoshi, Tabata Hitoshi
    • Journal Title

      APPLIED PHYSICS LETTERS

      Volume: 113 Issue: 1 Pages: 012103-012103

    • DOI

      10.1063/1.5034494

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Polarization imaging of imperfect m-plane GaN surfaces2017

    • Author(s)
      Yuji Sakai, Iwao Kawayama, Hidetoshi Nakanishi, Masayoshi Tonouchi
    • Journal Title

      APL Photonics

      Volume: 2 Issue: 15 Pages: 3056-3059

    • DOI

      10.1364/ol.42.003056

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Polarization imaging of imperfect m-plane GaN surfaces2017

    • Author(s)
      Yuji Sakai, Iwao Kawayama, Hidetoshi Nakanishi, and Masayoshi Tonouchi
    • Journal Title

      APL Photonics

      Volume: 2 Issue: 4 Pages: 041304-041304

    • DOI

      10.1063/1.4979511

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] テラヘルツ放射分光・イメージングによる半導体材料・デバイス評価2018

    • Author(s)
      川山 巌
    • Organizer
      電子情報通信学会電子デバイス研究会(ED)テラヘルツ応用システム研究会(THz)
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Terahertz emission spectroscopy and imaging for energy saving material/device development2018

    • Author(s)
      Iwao Kawayama
    • Organizer
      The 2nd International Conference on Advanced Materials and Processes for Environment, Energy and Health
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Evaluation of semiconductor materials and devices by laser-induced terahertz emissions2018

    • Author(s)
      Iwao Kawayama
    • Organizer
      SPIE Optical Engineering + Applications Conrerence
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Characteristics of Laser-Induced Terahertz Emissions from Gallium Oxide Surfaces2018

    • Author(s)
      Jian Hao, Gong Chen, Tatsuhiko Nishimura, Hidetoshi Nakanishi, Hironaru Murakami, Masayoshi Tonouchi, Iwao Kawayama
    • Organizer
      25th INTERNATIONAL WORKSHOP ON OXIDE ELECTRONICS
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Terahertz emission spectroscopy of wide band gap semiconductors2018

    • Author(s)
      Iwao Kawayama
    • Organizer
      Collaborative Conference on Materials Research 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Probing interface potential of semiconductor heterostructures with laser terahertz emission spectroscopy2018

    • Author(s)
      Iwao Kawayama
    • Organizer
      The 9th International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 新電子材料の光・テラヘルツ機能創製と規デバイス応用2018

    • Author(s)
      川山巌
    • Organizer
      岡山大学ナノ材料シンポジウム
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Observation of 4H-SiC Wafers and a SiC Photodiode Using a Laser Terahertz Emission Microscope2017

    • Author(s)
      H. Nakanishi, T. Nishimura, F. Kitamura, K. Fujita, M. Mizubata, I. Kawayama and M. Tonouchi
    • Organizer
      The 4th International Symposium on Microwave/Terahertz Science
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Polarization imaging of GaN using laser terahertz emission microscopy2017

    • Author(s)
      Iwao Kawayama
    • Organizer
      4th Japan-Korea International Symposium on Materials Science and Technology 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] テラヘルツ顕微鏡で見る省エネルギー材料・デバイス~持続可能社会の実現に貢献する先端計測技術~2016

    • Author(s)
      川山巌
    • Organizer
      ハイテク推進セミナー
    • Place of Presentation
      大阪(阪急ターミナルビル14階・島津マルチホール)
    • Year and Date
      2016-11-09
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] テラヘルツ波放射によるm面GaNの自発分極の評価2016

    • Author(s)
      酒井裕司、川山巌、中西英俊、斗内政吉
    • Organizer
      第77回応用物理学会秋季学術講演会
    • Place of Presentation
      新潟(朱鷺メッセ)
    • Year and Date
      2016-09-15
    • Related Report
      2016 Annual Research Report
  • [Presentation] Laser Terahertz Emission Microscopy for the Inspection of Semiconductor Materials and Devices2016

    • Author(s)
      Iwao Kawayama
    • Organizer
      The 10th Asia-Pacific Laser Symposium
    • Place of Presentation
      Jeju, Korea
    • Year and Date
      2016-05-10
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2016-04-21   Modified: 2020-03-30  

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