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2008 Fiscal Year Annual Research Report

分子性固体における電荷輸送とその動的現象の解明

Research Project

Project/Area Number 20685014
Research InstitutionChiba University

Principal Investigator

解良 聡  Chiba University, 大学院・融合科学研究科, 准教授 (10334202)

Keywords表面界面物性 / 有機半導体 / 電子分光 / 薄膜 / 分子配向 / 有機半導体デバイス / 移動度
Research Abstract

本研究では有機半導体薄膜特有の電子構造について「分子振動と電荷結合」というキーワードを掲げて研究を行った。弱い相互作用で結ばれた分子性固体中の電荷の動きを如何にして捉えるか、電子論物理的に記述できるかが命題である。光電子分光法という古来の手法を高精度測定を通じて有機半導体の系に斬新に活用することにより、ホッピング伝導の重要な要素である再配向エネルギーとトランスファー積分の両者に直接的に踏み込むことができる。これまでに見出された、グラファイト基板上に分子を真空蒸着する手法により、これまで埋もれていた微細情報をあらわにすることに成功し、有機半導体の移動度の「第一原理測定」法としてのノウハウを蓄積した。20年度は測定精度を飛躍的に向上させ、かつ高精度に角度分解測定を実施するために、新たに設置した高分解能静電半球型エネルギー分析器(SCIENTA R3000)の調整作業に費やした。現在、一般的な光電子スペクトルの測定が可能な状態になり、分析器エネルギー分解能1.8meVを達成した。また有機半導体試料に対する、測定パラメータの最適化条件を検討し、次年度以降の新展開が期待できる状況となっている。さらに動的現象解明のため、弱く物理吸着した界面における価電子帯ホールの寿命問題について理論モデルの可能性を検討した。また本課題の主題である電荷移動度の第一原理測定が評価され、「Progress in Surface Science誌」においてハイライト研究として総説を発表した。

  • Research Products

    (17 results)

All 2009 2008 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (12 results) Remarks (1 results)

  • [Journal Article] Electron spectroscopy of functional organic thin films : Deep insights into valence electronic structure in relation to charge transport property2008

    • Author(s)
      N Ueno and S. Kera
    • Journal Title

      Progress in Surface Science 83

      Pages: 490-557

    • Peer Reviewed
  • [Journal Article] Vacuum sublimed a,w-dihexylsexithiophene thin films : Correlating electronic structure and molecular orientation2008

    • Author(s)
      S. Duhm, et.al.
    • Journal Title

      Journal of Applied Physics 104

      Pages: 033717-1-7

    • Peer Reviewed
  • [Journal Article] Energy band and electron-vibration coupling in organic thin films : Photoe lectron spectroscopy as a powerful tool for studying the charge transport2008

    • Author(s)
      N. Ueno, et.al.
    • Journal Title

      Applied Physics A : Materials Science and Processing 92

      Pages: 495-504

    • Peer Reviewed
  • [Journal Article] A multi-technique investigation of TiO_2 films prepared by magnetron sput tering2008

    • Author(s)
      M. B. Casu, et.al.
    • Journal Title

      Surface Science 602

      Pages: 1599-1606

    • Peer Reviewed
  • [Presentation] Substrate-induced molecular orientation of C1Ga-phthalocyanine studied by MAES and UPS2009

    • Author(s)
      T. Hosokai, et.al.
    • Organizer
      73th. Physikertagung der DPG
    • Place of Presentation
      Dresden, Germany
    • Year and Date
      2009-03-23
  • [Presentation] Correlating bonding distance and interfacial electronic structure : the role of molecular side groups2009

    • Author(s)
      S. Duhm, et.al.
    • Organizer
      73th. Physikertagung der DPG
    • Place of Presentation
      Dresden, Germany
    • Year and Date
      2009-03-23
  • [Presentation] Electronic fine structures of perfluoropentacene films by ultraviolet pfhotoelectron spectroscopy2009

    • Author(s)
      S. Hosoumi, et.al.
    • Organizer
      73th. Physikertagung der DPG
    • Place of Presentation
      Dresden, Germany
    • Year and Date
      2009-03-23
  • [Presentation] Evolution, of the 3d-derived states in transition metal-phthalocyanine flums2009

    • Author(s)
      S. Kera, et.al.
    • Organizer
      The 5th International Conference on Molecular Electronics and Bioelectronics
    • Place of Presentation
      Miyazaki, Japan
    • Year and Date
      2009-03-18
  • [Presentation] Bridge over a molecular property from vdW interaction to strong crrelation2009

    • Author(s)
      S. Kera
    • Organizer
      Mini Symposium on the Electronic Structure of Organic Molecules and Solids
    • Place of Presentation
      Chiba, Japan
    • Year and Date
      2009-02-03
  • [Presentation] Electronic structure of weakly interacting organic films : Localized and delocalized state2008

    • Author(s)
      S. Kera
    • Organizer
      Workshop on Electrical and Electronic Properties in Crystalline Thin Films of Small-Molecules
    • Place of Presentation
      Chiba, Japan
    • Year and Date
      2008-12-19
  • [Presentation] A fascinating molecule : Mn-Phthalocyanine2008

    • Author(s)
      S. Kera
    • Organizer
      Workshop on Resent research in organic and molecular electronics
    • Place of Presentation
      Chiba, Japan
    • Year and Date
      2008-11-11
  • [Presentation] Vibrational properties of pi-conjugated molecules deposited on graphite2008

    • Author(s)
      K. Fujii, et.al.
    • Organizer
      25th European Conference on Surface Science
    • Place of Presentation
      Liverpool, UK
    • Year and Date
      2008-07-26
  • [Presentation] Hopping mobility of perfluoropentacene films measured with high-resoluti on UPS : Effects of fluorination on the charge reorganization energy of pentacene films2008

    • Author(s)
      S. Hosoumi, et.al.
    • Organizer
      8th International Symposium on Functional π-Electron Systems
    • Place of Presentation
      Graz, Austlia
    • Year and Date
      2008-07-12
  • [Presentation] Theoretical analysis of spin-polarized pi-d hybridized states of Mn-phthal ocyanine2008

    • Author(s)
      S. Nagamatsu, et.al.
    • Organizer
      Electronic Structure and Processes at Molecular-Based Interfaces
    • Place of Presentation
      Princeton, USA
    • Year and Date
      2008-06-10
  • [Presentation] Direct study of the gap states in organic semiconductors with ultralow b ackground UPS : Impact of the gap states on the Fermi level position2008

    • Author(s)
      T. Sueyoshi, et.al.
    • Organizer
      Electronic Structure and Processes at Molecular-Based Interfaces
    • Place of Presentation
      Princeton, USA
    • Year and Date
      2008-06-10
  • [Presentation] Spontaneous Charge Transfer at Physisorbed Molecular Interfaces2008

    • Author(s)
      S. Kera, et.al.
    • Organizer
      Electronic Structure and Processes at Molecular-Based Interfaces
    • Place of Presentation
      Princeton, USA
    • Year and Date
      2008-06-10
  • [Remarks]

    • URL

      http://ulab-www.tf.chiba-u.jp/

URL: 

Published: 2010-06-11   Modified: 2016-04-21  

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