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Theoretical Study on Carrier Transport in SiC MOS Interfaces

Research Project

Project/Area Number 19K23514
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0302:Electrical and electronic engineering and related fields
Research InstitutionOsaka University (2020)
Kyoto University (2019)

Principal Investigator

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

Project Period (FY) 2019-08-30 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords炭化ケイ素 / MOS界面 / 移動度 / シミュレーション / SiC / Hall移動度 / 散乱過程 / モンテカルロ法
Outline of Research at the Start

炭化ケイ素(SiC)MOS界面には高密度の界面準位が存在するが、このような系におけるキャリア輸送を記述する物理モデルは確立されていない。本研究では、SiC MOS界面におけるキャリア輸送の理論を構築することを主目的とし、SiC MOS界面におけるキャリア散乱機構の理論的定式化およびキャリア輸送特性の計算を行う。計算結果と実験結果との系統的な比較を通じて、移動度などの物性値を予測可能な物理モデルを構築する。さらに、これに基づいてSiC MOSFETにおけるキャリア輸送シミュレーションを行い、デバイス特性を記述可能な理論を完成させること、およびその高性能化の指針を提示することを目指す。

Outline of Final Research Achievements

In this study, a carrier scattering model for SiC MOS inversion layers was developed and the Hall mobility of mobile electrons was calculated. Among the scattering processes, by fitting the parameters for the spatial distribution of electrically neutral defects, the experimentally reported behaviors of Hall mobility in SiC MOSFETs were reproduced to some extent. Based on this model, the drift mobility and the effective mobility, which describes the drain current characteristics of devices, were also investigated.
In addition, the electronic states in bulk SiC and the two-dimensional electronic states in triangular potential were analyzed based on a more accurate description.

Academic Significance and Societal Importance of the Research Achievements

本研究で構築したキャリア散乱モデルにより,多数のフィッティングパラメータを含むという問題点はあるものの,実験で報告されているSiC MOS反転層における移動度の振る舞いを,ある程度よく再現することができた.本成果は,今後の移動度律速要因の解明や,移動度向上指針の提示の基礎となる.また,電子状態のより高精度な記述は,MOS反転層の移動度モデルの高精度化につながるものである.

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (10 results)

All 2021 2020 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (9 results) (of which Int'l Joint Research: 4 results,  Invited: 2 results)

  • [Journal Article] Theoretical analysis of band structure effects on impact ionization coefficients in wide-bandgap semiconductors2020

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

      Applied Physics Express

      Volume: 13 Issue: 4 Pages: 041006-041006

    • DOI

      10.35848/1882-0786/ab7f16

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Monte Carlo simulation of two-dimensional carrier mobility in wide-gap semiconductor devices2021

    • Author(s)
      N. Mori, H. Tanaka, T. Hoshino, G. Mil'nikov
    • Organizer
      International Symposium on Wide Gap Semiconductor Growth, Process and Device Simulation 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Electronic States in 4H-SiC MOS Inversion Layers Considering Crystal Structure Using Empirical Pseudopotential Method2021

    • Author(s)
      S. Nagamizo, H. Tanaka, N. Mori
    • Organizer
      International Workshop on Computational Nanotechnology 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 衝突イオン化係数のバンド構造に対する依存性の理論的解析2020

    • Author(s)
      田中 一, 木本 恒暢, 森 伸也
    • Organizer
      第81回応用物理学会秋季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 界面準位の影響に着目したSiC MOS反転層における電子輸送の理論的検討2020

    • Author(s)
      田中 一, 森 伸也
    • Organizer
      先進パワー半導体分科会第6回個別討論会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 経験的擬ポテンシャル法を用いた4H-SiCにおける浮遊電子状態の計算2020

    • Author(s)
      永溝 幸周, 田中 一, 森 伸也
    • Organizer
      先進パワー半導体分科会第7回講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ワイドギャップ半導体の衝突イオン化係数にバンド構造が与える影響の解析2020

    • Author(s)
      田中一,木本恒暢,森伸也
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Monte Carlo Simulation of Hall Mobility in 4H-SiC MOS Inversion Layers2019

    • Author(s)
      Hajime Tanaka and Nobuya Mori
    • Organizer
      International Conference on Silicon Carbide and Related Materials 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Theoretical Study of Band Structure Effects on Impact Ionization Coefficients in Wide-bandgap Semiconductors2019

    • Author(s)
      Hajime Tanaka, Nobuya Mori, and Tsunenobu Kimoto
    • Organizer
      9th Asia-Pacific Workshop on Widegap Semiconductors
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 衝突イオン化係数にバンド構造が与える影響の理論解析2019

    • Author(s)
      田中一,木本恒暢,森伸也
    • Organizer
      応用物理学会先進パワー半導体分科会第6回講演会
    • Related Report
      2019 Research-status Report

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Published: 2019-09-03   Modified: 2022-01-27  

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