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Elucidation of effects of interfacial electronic states on thermoelectric properties of core-shell Si nanowires

Research Project

Project/Area Number 20K15150
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 28050:Nano/micro-systems-related
Research InstitutionKobe University

Principal Investigator

Uesugi Akio  神戸大学, 工学研究科, 助教 (90821710)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsシリコンナノワイヤ / 熱電発電 / コア/シェル半導体 / ナノ構造 / 集積化技術 / 熱電変換
Outline of Research at the Start

従来の均質なシリコンナノワイヤ(SiNWs)では到達できなかった高変換効率熱電素子の実現を目指し、『界面電子状態制御型 コアシェル(Core/shell) SiNWs』を新開発して、その性能を評価することで、界面電子状態がSiNWsの熱電変換効率に及ぼす影響の解明を目指す。C/S SiNWs熱電変換素子は、評価素子上にSiNWsを直接架橋結晶成長させて、表層のみへの不純物拡散、ナノスケール厚さの絶縁膜成膜を行うことで形成する。コアシェル化による界面の高電気伝導性と、ナノ構造化による低熱伝導性を有する素子を形成し、均質なSi及びSiNWsを大きくこえる熱電変換効率の達成を目指す。

Outline of Final Research Achievements

In order to clarify the effect of the interfacial surface potential induced by core-shell structuring with dielectric films on the thermoelectric properties of silicon nanowires, a new method for integration of crystal-grown silicon nanowire bridges and evaluation device corresponding to the method were developed, and evaluations of the thermoelectric properties of core-shell silicon nanowires were performed. Evaluation results indicated a potential of improving thermoelectric efficiency on p-type silicon nanowires by core-shell structuring with Al2O3 film, because of relationship change between Seebeck coefficient and electrical conductivity.

Academic Significance and Societal Importance of the Research Achievements

本研究の中で提案した結晶成長SiNWsの成長方位制御手法と架橋集積手法は良好な結果を示し、これは熱電特性評価構造や発電モジュールの構築だけでなく、ナノワイヤを用いた様々な微小センサや電子素子の構築へと貢献しうるものである。またこれまでに報告されているp型シリコンナノ構造のゼーベック係数は、同キャリア濃度ではバルクの傾向よりも大きく下回る低い傾向にあったが、コアシェル構造化はナノ構造の傾向を変化させる可能性を持つことが示され、これはナノ構造を用いた熱電発電モジュールの性能向上に貢献しうるものである。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (12 results)

All 2023 2022 2021 2020

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

  • [Journal Article] モノリシック集積コアシェルSiナノワイヤ架橋構造の熱起電力評価2023

    • Author(s)
      上杉 晃生, 西依 脩祐, 菅野 公二, 磯野 吉正
    • Journal Title

      電気学会論文誌E

      Volume: 143

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Surface-Potential-Modulated Piezoresistive Effect of Core-Shell 3C-SiC Nanowires via Passivation2022

    • Author(s)
      Akio Uesugi, Shinya Nakata, Kodai Inoyama, Koji Sugano, Yoshitada Isono
    • Journal Title

      Nanotechnology

      Volume: 33 Issue: 50 Pages: 1-11

    • DOI

      10.1088/1361-6528/ac8d11

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Integration of silicon nanowire bridges in microtrenches with perpendicular bottom-up growth promoted by surface nanoholes2022

    • Author(s)
      Uesugi Akio、Nishiyori Shusuke、Nakagami Tatsuya、Sugano Koji、Isono Yoshitada
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: - Issue: 7 Pages: 075502-075502

    • DOI

      10.35848/1347-4065/ac50bd

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Vapor-liquid-solid growth of silicon nanowires from surface nanoholes formed with metal-assisted chemical etching2021

    • Author(s)
      Uesugi Akio、Horita Taiju、Sugano Koji、Isono Yoshitada
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: 5 Pages: 055502-055502

    • DOI

      10.35848/1347-4065/abf22d

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] EVALUATION OF THERMOELECTRIC PROPERTIES OF MONOLITHICALLY-INTEGRATED CORE-SHELL Si NANOWIRE BRIDGES2023

    • Author(s)
      Akio Uesugi, Shusuke Nishiyori, Koji Sugano, Yoshitada Isono
    • Organizer
      The 36th International Conference on Micro Electro Mechanical Systems (IEEE MEMS 2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] モノリシック集積コアシェルSi ナノワイヤ架橋構造の熱起電力評価2022

    • Author(s)
      上杉 晃生, 西依 脩祐, 菅野 公二, 磯野 吉正
    • Organizer
      第39回「センサ・マイクロマシンと応用システム」シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] Promotion of perpendicular growth of silicon nanowires by MACE-formed surface nanoholes2021

    • Author(s)
      Akio Uesugi, Syusuke Nishiyori, Koji Sugano, Yoshitada Isono
    • Organizer
      34th International Microprocesses and Nanotechnology Conference (MNC2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] コアシェルSiCナノワイヤのピエゾ抵抗効果に及ぼすシェル表面電位の影響評価2021

    • Author(s)
      上杉晃生,仲田進哉,菅野公二,磯野吉正
    • Organizer
      第6回マルチスケール材料力学シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] コアシェル構造SiCナノワイヤの界面静電場によるピエゾ抵抗効果の制御2021

    • Author(s)
      上杉 晃生, 仲田 進哉, 菅野 公二, 磯野 吉正
    • Organizer
      第38回「センサ・マイクロマシンと応用システム」シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] MACE表面ナノホールのシリコンナノワイヤ垂直成長促進効果2021

    • Author(s)
      上杉 晃生, 西依 脩佑, 菅野 公二, 磯野 吉正
    • Organizer
      第38回「センサ・マイクロマシンと応用システム」シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] Anomalous piezoresistive changes of core-shell structured SiC nanowires2021

    • Author(s)
      A. Uesugi, S. Nakata, K. Sugano, Y. Isono
    • Organizer
      The 34th IEEE International Conference on Micro Electro Mechanical Systems (IEEE MEMS 2021)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Growth Direction of VLS Silicon Nanowires with Surface Nanoholes Formed Using MACE2020

    • Author(s)
      A. Uesugi, T. Horita, K. Sugano, Y. Isono
    • Organizer
      33rd International Microprocesses and Nanotechnology Conference (MNC2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2024-01-30  

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