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Theoretical Study on Impact Ionization Phenomena in Wide-bandgap Semiconductors

Research Project

Project/Area Number 21K14195
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 21050:Electric and electronic materials-related
Research InstitutionOsaka University

Principal Investigator

Tanaka Hajime  大阪大学, 大学院工学研究科, 助教 (40853346)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywordsモンテカルロ / 高電界 / 衝突イオン化 / ワイドギャップ半導体 / キャリア輸送 / シミュレーション
Outline of Research at the Start

炭化ケイ素・酸化ガリウムなどのワイドギャップ半導体は、大きな絶縁破壊電界を持つことから、高耐圧パワーデバイス用材料として期待されている。しかし、絶縁破壊電界を決定する物性値である衝突イオン化係数が、これらの材料のどのような性質に支配されているかは明らかになっていない。
本研究では、ワイドギャップ半導体に関して、高電界におけるキャリア輸送および衝突イオン化係数の理論解析を行い、これらの振る舞いを、バンド構造や散乱レートが衝突イオン化係数に与える影響に着目して定量的に理解することを目指す。

Outline of Final Research Achievements

In this study, we theoretically analyzed the high-field carrier transport properties, such as the impact ionization coefficients, in various wide-bandgap semiconductors. We performed Monte Carlo simulations considering the full band structures of silicon carbide, gallium nitride, and gallium oxide. Monte Carlo simulations considering the analytical band structures were also performed. Based on both simulations, we discussed the behaviors of the impact ionization coefficients focusing on the band structures and scattering rates.

Academic Significance and Societal Importance of the Research Achievements

本研究では,各種ワイドギャップ半導体における高電界キャリア輸送特性,特に衝突イオン化係数の振る舞いについて物理的な理解を与えている.また,実験結果や,より負荷の大きい数値計算による結果を,計算負荷をある程度抑えつつ再現するモデルを提示している.これらは,半導体材料物性への理解を深めるという学術的な側面と,デバイスの絶縁破壊特性の予測やその高耐圧化へ向けた構造設計・材料選択のための基礎となるといった実用的な側面との両面において意義のある成果であると言える.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (12 results)

All 2024 2023 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Journal Article] Full-band Monte Carlo analysis of strain effects on carrier transport in GaN2024

    • Author(s)
      Miyazaki Wataru, Tanaka Hajime, Mori Nobuya
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 63 Issue: 2 Pages: 02SP35-02SP35

    • DOI

      10.35848/1347-4065/ad1005

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Theoretical study on high-field carrier transport and impact ionization coefficients in 4H-SiC2024

    • Author(s)
      Tanaka Hajime, Kimoto Tsunenobu, Mori Nobuya
    • Journal Title

      Materials Science in Semiconductor Processing

      Volume: 173 Pages: 108126-108126

    • DOI

      10.1016/j.mssp.2024.108126

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Tight-binding analysis of the effect of strain on the band structure of GaN2023

    • Author(s)
      W. Miyazaki, H. Tanaka, and N. Mori
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: SC Pages: SC1076-SC1076

    • DOI

      10.35848/1347-4065/acb7fe

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Simulation analysis of high-field carrier transport in wide-bandgap semiconductors considering tunable band structures and scattering processes2022

    • Author(s)
      H. Tanaka, T. Kimoto, and N. Mori
    • Journal Title

      Journal of Applied Physics

      Volume: 131 Issue: 22 Pages: 225701-225701

    • DOI

      10.1063/5.0090308

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Impacts of band structures and scattering processes on high-field carrier transport in wide bandgap semiconductors2023

    • Author(s)
      H. Tanaka, T. Kimoto, N. Mori
    • Organizer
      International Workshop on Computational Nanotechnology
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Full-band Monte Carlo analysis of the effects of strain on the impact ionization of GaN2023

    • Author(s)
      W. Miyazaki, H. Tanaka, N. Mori
    • Organizer
      22nd International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Full-Band Monte Carlo Analysis of Strain Effects on Carrier Transport in GaN2023

    • Author(s)
      W. Miyazaki, H. Tanaka, N. Mori
    • Organizer
      2023 International Conference on Solid State Devices and Materials
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 4H-SiCの衝突イオン化係数の理論解析2023

    • Author(s)
      田中 一, 木本 恒暢, 森 伸也
    • Organizer
      第83回 応用物理学会 秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] GaNのバンド構造に歪みが与える影響の強束縛近似法に基づく解析2022

    • Author(s)
      宮崎 航, 田中 一, 森 伸也
    • Organizer
      第83回 応用物理学会 秋季学術講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] Tight-Binding Analysis of the Effect of Strain on the Band Structure of GaN2022

    • Author(s)
      W. Miyazaki, H. Tanaka, and N. Mori
    • Organizer
      2022 International Conference on Solid State Devices and Materials
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Tight-binding and full-band Monte Carlo analysis of the strain effects in wurtzite GaN2022

    • Author(s)
      W. Miyazaki, H. Tanaka, and N. Mori
    • Organizer
      Workshop on Innovative Nanoscale Devices and Systems 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 強束縛近似法による酸化ガリウムの電子状態の解析に関する研究2021

    • Author(s)
      入田一輝,岡田丈,橋本風渡,田中一,森伸也
    • Organizer
      第82回応用物理学会 秋季学術講演会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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