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Contact resistance lowering at metal/Ge interface by controlling metal property and interface structure

Research Project

Project/Area Number 17K06374
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Electron device/Electronic equipment
Research InstitutionThe University of Tokyo

Principal Investigator

Nishimura Tomonori  東京大学, 大学院工学系研究科(工学部), 技術専門職員 (10396781)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Keywordsゲルマニウム / シリコン / フェルミレベルピンニング / ショットキー障壁 / 金属/半導体界面 / 仕事関数 / コンタクト抵抗 / 電子デバイス・機器 / MOSFET
Outline of Final Research Achievements

In this work, we proposed a metal work function modulation model for Fermi level pinning at the metal/semiconductor interface, and verified and advanced the model.
We experimentally demonstrated that the semiconductors such as Si and Ge can be reasonably described by the work function modulation model, and that the work function modulation is weakened by lowering electron density in metal.
Based on the fact that the vacuum work function of metal is affected by the surface structure of metal, it was clarified that the work function modulation effect at semiconductor interface is also affected by semiconductor structure especially like surface orientation of semiconductor. We also proposed a concept of holes contribution at semiconductor interface.

Academic Significance and Societal Importance of the Research Achievements

典型的な半導体材料であるSiや次世代半導体材料として有望なGeは,その金属との界面に生じるフェルミレベルピンニングが物理描像として本質的な仕事関数の変調効果として描像できるモデルを提案し,実験的に実証した.このモデルはSi,Geに限らず一般的な金属/半導体界面のショットキー障壁高さの決定機構へ適用することができ,理想的界面におけるショットキー障壁高さの制御の方向性を示している.この研究成果は技術的要求のある低抵抗金属/半導体ダイレクト界面形成等の半導体技術分野への貢献は勿論,半導体物理分野においても新たに一般化された理解の方向性を提案することができた.

Report

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

    (13 results)

All 2020 2019 2018 2017

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (10 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results)

  • [Journal Article] Understanding of Fermi level pinning at metal/germanium interface based on semiconductor structure2020

    • Author(s)
      Luo Xuan、Nishimura Tomonori、Yajima Takeaki、Toriumi Akira
    • Journal Title

      Applied Physics Express

      Volume: 13 Issue: 3 Pages: 031003-031003

    • DOI

      10.35848/1882-0786/ab7713

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Almost pinning-free bismuth/Ge and /Si interfaces2019

    • Author(s)
      Nishimura Tomonori、Luo Xuan、Matsumoto Soshi、Yajima Takeaki、Toriumi Akira
    • Journal Title

      AIP Advances

      Volume: 9 Issue: 9 Pages: 095013-095013

    • DOI

      10.1063/1.5115535

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Reconsideration of Metal Work Function at Metal/Semiconductor Interface2017

    • Author(s)
      Nishimura Tomonori, Yajima Takeaki, and Toriumi Akira
    • Journal Title

      ECS Transactions

      Volume: 80 Issue: 4 Pages: 107-112

    • DOI

      10.1149/08004.0107ecst

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Understanding and control of Fermi level pinning at metal/germanium interface2019

    • Author(s)
      T. Nishimura, X. Luo, T. Yajima, and A. Toriumi
    • Organizer
      IEEE Int.Interconnect Technology Conference and Materials for Advanced Metallization Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Silicide/Si 界面における弱いFermi-level pinningの起源2019

    • Author(s)
      西村 知紀,羅 シュアン,矢嶋 赳彬,鳥海 明
    • Organizer
      2019年応用物理学会春季学術講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] Schottky界面におけるTwo-band MIGS (metal induced gap states) モデル2019

    • Author(s)
      西村 知紀,矢嶋 赳彬,鳥海 明
    • Organizer
      2019年応用物理学会春季学術講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] Understanding and control of Fermi level pinning at metal/germanium interface2019

    • Author(s)
      T. Nishimura, X. Luo, T. Yajima, and A. Toriumi
    • Organizer
      International Interconnect Technology Conference & Materials for Advanced Metallization
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Reexamination of Fermi level pinning for controlling Schottky barrier height at metal/Ge interface2018

    • Author(s)
      西村 知紀,矢嶋 赳彬,鳥海 明
    • Organizer
      2018年応用物理学会秋季学術講演会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Further investigation of Fermi-level pinning on Ge from substrate side2018

    • Author(s)
      T. Nishimura, X. Luo, T. Yajima, and A. Toriumi
    • Organizer
      49th IEEE Semiconductor Interface Specialists Conference
    • Related Report
      2018 Research-status Report
  • [Presentation] 半導体界面における金属の仕事関数は真空で良いか?2018

    • Author(s)
      西村 知紀,羅 シュアン,矢嶋 赳彬,鳥海 明
    • Organizer
      電子デバイス界面テクノロジー研究会
    • Related Report
      2018 Research-status Report
  • [Presentation] 金属/Ge 界面のFermi-level pinningに及ぼすGe の基板面方位効果2018

    • Author(s)
      西村 知紀,羅 シュアン;,矢嶋 赳彬,鳥海 明
    • Organizer
      電子デバイス界面テクノロジー研究会
    • Related Report
      2018 Research-status Report
  • [Presentation] Generalized picture of work function of a metal with Schottky interface2017

    • Author(s)
      T. Nishimura, T. Yajima, and A. Toriumi
    • Organizer
      International Conference on Solid State Devices and Materials
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Reconsideration of Metal Work Function at Metal/Semiconductor Interface2017

    • Author(s)
      T. Nishimura, T. Yajima, and A. Toriumi
    • Organizer
      Electrochemical Society Meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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

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