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Development of structural optimization method for thermoelectric conversion and novel heat transfer materials

Research Project

Project/Area Number 20K14664
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionTokyo University of Agriculture and Technology

Principal Investigator

Hori Takuma  東京農工大学, 工学(系)研究科(研究院), 准教授 (50791513)

Project Period (FY) 2020-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords熱伝導率 / シリコン薄膜 / 熱電変換 / フォノン輸送 / 熱伝導 / エネルギー変換
Outline of Research at the Start

ナノスケールの構造を作ることで性能が向上または発現する熱伝導デバイスの構造最適化を目的とする.例えば熱電変換素子において,熱伝導率が低く電気伝導率が高いほど性能が上がるため,これらの両者のキャリアの輸送にとって最適なナノ構造を見つけ出すシミュレーション手法を構築する.またシミュレーションをより簡潔かつ現実を良く再現可能な手法に発展させ,様々な形状のナノ構造における性能の最適化を行う.以上に加え,熱ダイオード等の新奇熱伝導デバイスにも開発した手法を応用し,実際のデバイスの設計に貢献する.

Outline of Final Research Achievements

An optimization method for thermal conductivity of nanostructured silicon thin films is developed. The optimization is realized by combining the phonon ray tracing and simulated annealing method. More specifically, the nanostructured thin films consisted of square lattices is gradually varied in each step. Phonon mean free path of each structure, which is the dominant factor for thermal conductivity, is evaluated by the ray tracing simulations. The new structure is accepted when its mean free path is closer to the optimum; if not, it is also accepted according to probability to avoid local optimum solution. The validity of the developed method is confirmed by comparing the results with those obtained by a brutal search. The influence of the parameters of the simulated annealing method on the predicted optimal structure is also verified, indicating that the parameter tuning leads to more efficient optimization.

Academic Significance and Societal Importance of the Research Achievements

シリコンは資源としての豊富さや無毒性などの長所を持つことから,様々なデバイスに利用されている.一方で,熱電変換材料としてはその高い熱伝導率に起因した低い変換効率が課題となっている.そうした中で,本研究では熱伝導率を下げる最適ナノ構造の探索方法を開発したため,デバイスの進歩に直接的に貢献することを期待する.同時に,熱電変換材料だけにとどまらず,開発した手法は様々な場面に際して応用可能であると考える.また,「ナノ構造中の熱輸送にとって決定的に重要な要素は何か」といった学術の基礎的理解を追求する研究を応用の観点から刺激する作用も期待できる.

Report

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

    (10 results)

All 2022 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 3 results) Book (1 results)

  • [Int'l Joint Research] University of California Berkeley(米国)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Structural optimization of silicon thin film for thermoelectric materials2021

    • Author(s)
      Hori Takuma
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 22648-22648

    • DOI

      10.1038/s41598-021-01855-6

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Thermal conductivity of single-walled carbon nanotubes under torsional deformation2021

    • Author(s)
      Nagaya Hayato、Cho JunHee、Hori Takuma
    • Journal Title

      Journal of Applied Physics

      Volume: 130 Issue: 21 Pages: 215106-215106

    • DOI

      10.1063/5.0073709

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] ナノ多結晶におけるフォノンの平均自由行程の理論的予測2022

    • Author(s)
      堀 琢磨, Dames Chris
    • Organizer
      第59回日本伝熱シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] Prediction of phonon mean free path in polycrystalline nanostructures based on mean square displacement2021

    • Author(s)
      Takuma Hori
    • Organizer
      7th Micro and Nano Flows Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ナノ構造化シリコン薄膜の熱電変換材料としての構造最適化2021

    • Author(s)
      堀 琢磨
    • Organizer
      第58回日本伝熱シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] ナノ構造化シリコンの伝熱特性の最適化に向けたフォノン輸送解析2021

    • Author(s)
      堀 琢磨, 谷口 竜聖, 苫米地 陸
    • Organizer
      熱工学コンファレンス2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] Influence of torsional deformation on thermal conductivity of single-walled carbon nanotube bundles2020

    • Author(s)
      Hayato Nagaya, Junhee Cho, Takuma Hori
    • Organizer
      The 31st International Symposium on Transport Phenomena
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Prediction of optimized silicon nanostructure as thermoelectrics by exhastive search2020

    • Author(s)
      Takuma Hori
    • Organizer
      The 31st International Symposium on Transport Phenomena
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Book] 計算科学を活用した熱電変換材料の研究開発動向 第Ⅵ編 第1章 モンテカルロシミュレーションによるナノ構造化材料の熱伝導解析2022

    • Author(s)
      堀琢磨
    • Total Pages
      12
    • Publisher
      シーエムシー・リサーチ
    • ISBN
      9784910581187
    • Related Report
      2021 Annual Research Report

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Published: 2020-04-28   Modified: 2023-01-30  

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