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Elicitation and molecular control of ballistic conduction in organic semiconductors

Research Project

Project/Area Number 19K21966
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 21:Electrical and electronic engineering and related fields
Research InstitutionNagaoka University of Technology

Principal Investigator

Unuma Takeya  長岡技術科学大学, 工学研究科, 准教授 (20456693)

Project Period (FY) 2019-06-28 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywords共役ポリマー / テラヘルツ応答 / ナノセルロース / シリコーン / コンポジット薄膜 / テラヘルツ / 光物性 / 有機導体 / テラヘルツ/赤外材料・素子
Outline of Research at the Start

有機半導体において,電子の加速運動が妨げられずに続く現象(バリスティック伝導)を顕在化させ,有機デバイスの高速化へ向けてこの現象を制御することを目指す。従来,整然とした結晶構造を持たない有機薄膜中でバリスティック伝導を観測することは困難であると考えられてきた。本研究では,高分子の主鎖構造や低分子の結晶ドメインに内在する伝導経路に着目し,超短光パルス技術を利用してバリスティック伝導の顕在化と分子的制御に挑戦する。

Outline of Final Research Achievements

To elicit ballistic conduction in organic semiconductors, we designed a measurement system triggered by femtosecond optical pulses and also fabricated polymer-based films intended for the efficient creation of carriers and the formation of suitable conduction paths. It turned out that measurable terahertz emission due to the ballistic acceleration of carriers excited by optical pulses under high in-plane bias voltage needs further optimization of the film thickness and the excitation spot size depending on the choice of excitation wavelength. In addition, we offered the possibility of producing conduction paths protected against degradation in transparent polymeric host materials.

Academic Significance and Societal Importance of the Research Achievements

軽量・フレキシブル・低コストなど多くの利点を持つ有機薄膜デバイスについて,苦手とされてきた高速動作につながるバリスティック伝導に着目し,当該現象の顕在化と制御に挑戦した。フェムト秒光パルスを用いた観測手法におけるポイントを検証した一方,伝導経路形成の試行錯誤の過程では伸縮性を持つ透明静電防止膜などへ応用可能な試料も得られた。以上のように,本成果には有機半導体に関する複数方面への芽生えとしての意義がある。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2022 2021 2020 Other

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

  • [Int'l Joint Research] University of Eastern Finland/Abo Akademi University(フィンランド)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Eastern Finland/Abo Akademi University(フィンランド)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] University of Eastern Finland/Abo Akademi University(フィンランド)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Reversibly controlled infrared transparency of conjugated polymer films incorporated into a compact electrochemical cell structure2022

    • Author(s)
      T. Unuma, Y. Ishizaka
    • Journal Title

      Applied Optics

      Volume: 61 Issue: 3 Pages: 759-764

    • DOI

      10.1364/ao.447806

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Terahertz complex conductivity of stretchable semitransparent composite films made from polymeric materials PDMS and PEDOT:PSS2022

    • Author(s)
      T. Unuma, S. Kotaka
    • Journal Title

      Optical Materials Express

      Volume: 12 Issue: 2 Pages: 751-757

    • DOI

      10.1364/ome.449830

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Terahertz complex conductivity of cellulose nanocrystal based composite films controlled with PEDOT:PSS blending ratio2020

    • Author(s)
      T. Unuma, O. Kobayashi, S. Kotaka, R. Koppolu, M. Toivakka, J. J. Saarinen
    • Journal Title

      Cellulose

      Volume: 27 Issue: 17 Pages: 10019-10027

    • DOI

      10.1007/s10570-020-03464-4

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Fabrication and terahertz non-contact evaluation of transparent elastic organic films provided with conductivity2021

    • Author(s)
      S. Kotaka, O. Kobayashi, T. Unuma
    • Organizer
      The 6th International Conference on "Science of Technology Innovation" 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 導電性ポリマーを配合したナノセルロース薄膜のテラヘルツ複素伝導度2021

    • Author(s)
      小鷹尚也,小林想,鵜沼毅也,R. Koppolu,M Toivakka,J. J. Saarinen
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] 導電性ポリマーによって制御されたセルロースナノクリスタル薄膜のテラヘルツ伝導度スペクトル2020

    • Author(s)
      小鷹尚也,小林想,鵜沼毅也,R. Koppolu,M. Toivakka,J. J. Saarinen
    • Organizer
      令和2年度応用物理学会北陸・信越支部学術講演会
    • Related Report
      2020 Research-status Report

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Published: 2019-07-04   Modified: 2023-01-30  

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