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Mat of silicon nanowires as a highly efficient thermoelectric material

Research Project

Project/Area Number 17K18976
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Materials engineering and related fields
Research InstitutionTokyo University of Agriculture and Technology

Principal Investigator

Inasawa Susumu  東京農工大学, 工学(系)研究科(研究院), 准教授 (30466776)

Project Period (FY) 2017-06-30 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsシリコン / ナノワイヤー / ウィスカー / VLS成長 / ドーピング / 熱電変換 / 熱伝導率 / 反応器内のガス流れ / シリコンナノワイヤー / VLS / 熱伝導 / 熱伝導プロセス / ナノワイヤー膜 / 不純物ドーピング / 電気伝導 / ナノ材料
Outline of Final Research Achievements

We have revealed that boron-doped silicon wires form spontaneously in the gas phase reduction of SiCl4 with zinc vapor by introducing BCl3 in the same reactor. Silicon nanowires also form via the same vapor-liquid-solid (VLS) mechanism, and we consider that the same single-step synthesis of boron-doped silicon nanowires is possible. Furthermore, we have found a hidden role of gas flows in the reactor on the selective formation of silicon nanowires. Circulation flow around a baffle plate is one of the key issue in the formation of nanowires. We have also examined a new measurement system for thermal conductivity of mat of nanowires. Our study shows a possibility of easy-handling of mat of nanowires. In addition, it contributes to the basic understanding in application of mat of silicon nanowires as a thermo-electric material.

Academic Significance and Societal Importance of the Research Achievements

反応性が低くあまり利用されてこなかった四塩化ケイ素(SiCl4)を原料に用いても、電気を通すシリコン合成ができることを世界で初めて示した。これまで数多く報告されている金触媒以外にも亜鉛触媒でドーピングナノワイヤー/ウィスカーを合成可能であることを示せた。またナノワイヤーを効率的に合成する条件を明らかにできた。これにより、これまでサンプル量が少なく進まなかった研究が加速できる。不織布状シリコンナノワイヤー膜の熱伝導率測定の可能性も示せた。地球に豊富なケイ素を用いた材料で温度差から電気を取り出す熱電変換材料に展開するための基盤技術を整備できた。

Report

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

    (5 results)

All 2020 2019 2018 2017

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (3 results)

  • [Journal Article] Experimental and numerical approaches on the effect of gas flow on the formation of tens-square-cm-scale mat of silicon nanowires from SiCl4 and zinc vapor2019

    • Author(s)
      Susumu Inasawa
    • Journal Title

      Journal of Crystal Growth

      Volume: 520 Pages: 11-17

    • DOI

      10.1016/j.jcrysgro.2019.05.009

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Formation of thicker silicon wires on a sufficiently cooled substrate during the gas phase zinc reduction reaction of SiCl42019

    • Author(s)
      Naoki Shirane and Susumu Inasawa
    • Journal Title

      Journal of Crystal Growth

      Volume: 506 Pages: 171-177

    • DOI

      10.1016/j.jcrysgro.2018.10.033

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Boron-dopedシリコンウィスカーの自発生成と導電性の制御2020

    • Author(s)
      谷口竜之延、稲澤晋
    • Organizer
      化学工学会第85年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 亜鉛還元反応を用いたp-type Siワイヤ合成でのB濃度制御2018

    • Author(s)
      谷口竜之延、稲澤晋
    • Organizer
      化学工学会室蘭大会2018 (3支部合同大会)
    • Related Report
      2018 Research-status Report
  • [Presentation] 亜鉛還元法を用いたシリコンナノワイヤー膜合成における反応器内ガス流の影響2017

    • Author(s)
      井上介、稲澤晋
    • Organizer
      化学工学会第49回秋季大会
    • Related Report
      2017 Research-status Report

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Published: 2017-07-21   Modified: 2021-02-19  

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