• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Atomic-scale characterization of defects and dislocations using cross-sectional SPM: Application to GaN

Research Project

Project/Area Number 17K06366
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionNational Institute for Materials Science

Principal Investigator

ISHIDA Nobuyuki  国立研究開発法人物質・材料研究機構, 先端材料解析研究拠点, 主任研究員 (10451444)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords窒化ガリウム / 欠陥 / 走査型トンネル顕微鏡 / 原子間力顕微鏡 / ケルビンプローブフォース顕微鏡 / プローブ顕微鏡 / 欠陥評価 / STM / AFM
Outline of Final Research Achievements

The purpose of this research is to develop a method for evaluating defects and dislocations existing in gallium nitride (GaN) crystal with high spatial resolution, and to study the effect of defects and dislocations on performance of GaN devices. For that purpose, we attempted to evaluate the defects in a commercially available GaN single crystal substrate by measuring the cross section exposed by cleaving the substrate with several scanning probe microscopy techniques. As a result, we succeeded in observing some atomic scale defect structures. The obtained results are important findings when considering the structure and electronic state of defects. In the future, we plan to apply this method to the evaluation of epitaxial films used in the actual device structure.

Academic Significance and Societal Importance of the Research Achievements

近年、窒化ガリウム(GaN)を利用したデバイスの研究開発が盛んに行われている。これまでに、結晶中の欠陥や転位によってデバイス性能が大きく低下することが知られている。しかし、欠陥を評価する技術がほとんどないため「特性を劣化させる欠陥種は何か」など、基本的な知見が得られていない。本研究では、試料表面の物性を高い空間分解能で評価することができる走査型プローブ顕微鏡技術を応用し、原子スケールでGaN結晶中の欠陥を評価する技術を開発した。今後、この技術をデバイスで使用されるGaN結晶膜の評価へ応用することで、欠陥種の特定やその物性評価が可能となり、GaNデバイス性能向上への貢献が期待できる。

Report

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

    (4 results)

All 2020 2018

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (2 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Journal Article] Direct observation of charge accumulation in quantum well solar cells by cross-sectional Kelvin probe force microscopy2020

    • Author(s)
      Takeshi Noda, Nobuyuki Ishida, Takaaki Mano, and Daisuke Fujita
    • Journal Title

      Applied Physics Letters

      Volume: 116 Issue: 16 Pages: 163501-163501

    • DOI

      10.1063/1.5142438

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Multivariate analysis for scanning tunneling spectroscopy data2018

    • Author(s)
      Junsuke Yamanishi, Shigeru Iwase, Nobuyuki Ishid, and Daisuke Fujita
    • Journal Title

      Applied Surface Science

      Volume: 428 Pages: 186-190

    • DOI

      10.1016/j.apsusc.2017.09.124

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Characterization of carrier separation in perovskite solar cells using Kelvin probe force microscopy2018

    • Author(s)
      Nobuyuki Ishida and Daisuke Fujita
    • Organizer
      平成30年度大阪大学国際合同会議 “次世代機能性材料・表面/界面物性の解明と機能探索の動向”
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Operando Characterization of Energy Conversion and Storage Devices using Scanning Probe Microscopy2018

    • Author(s)
      Nobuyuki Ishida and Daisuke Fujita
    • Organizer
      First International Conference on 4D Materials and Systems
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi