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2007 Fiscal Year Annual Research Report

巨大分子吸着系における価電子帯ホール・振動結合:有機電荷輸送機構の解明

Research Project

Project/Area Number 17685019
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 / 有機デバイス
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た。ここで見出された、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。
一例として、n型半導体として知られるフッ素化ペンタセン分子の吸着膜を作製したところ、二分子層において特徴的な二量体構造を形成することを見出した。高分解能光電子分光測定の結果、単量体と二量体の電子構造の変化は劇的であり、エネルギー準位分裂によるトランスファー積分と、二量体化による再配向エネルギーの減少を直接捉えることに成功した。つまり分子性固体のような弱い相互作用(ファンデアワールスカ)により支配される系において、明らかに分子間相互作用によるエネルギー変化が生じており、その軌道間の相互作用は従来考えられてきた値よりも遙かに大きいことを示すことに成功した(投稿準備中)。二量体における分裂測定は、バルク(結晶)においてエネルギーバンド分散が形成される過程の最も初期段階の電子構造を捉えたことになり、孤立分子系からの一連の弱い相互作用系の電子論が議論可能となったと言える。本課題を通じて得られた結果に関してレビュー誌を2報投稿中である。
有機電荷輸送機構の全容解明には至っていないが、多くの周辺物理も同時に見出されており、分子性固体における基盤学理構築へ向けて確実に前進したといるといえる。

  • Research Products

    (23 results)

All 2008 2007 Other

All Journal Article (13 results) (of which Peer Reviewed: 12 results) Presentation (9 results) Remarks (1 results)

  • [Journal Article] A multi-technique investigation of TiO_2 films prepared by magnetron sputtering2008

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

      Surface Science 602

      Pages: 1599-1606

    • Peer Reviewed
  • [Journal Article] Chage in molecular conformation of dibenzo-crown ether induced by weak molecular-substrate interaction2008

    • Author(s)
      T. Hosokai, et. al.
    • Journal Title

      Journal of Physical Chemistry C 112

      Pages: 4643-4648

    • Peer Reviewed
  • [Journal Article] Role of intrinsic band-gap states for the energy level alignment at weakly interacting organic-conductor interfaces: Gap states versus band dispersion in pentacene thin films2007

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

      SPIE Proceedings 6656

      Pages: 0-1-9

    • Peer Reviewed
  • [Journal Article] Investigation of polarization effects in organic thin films by surface core-level shifts2007

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

      Physical Review B 76

      Pages: 193311-1-4

    • Peer Reviewed
  • [Journal Article] Photoemission microspectroscopy and imaging of bilayer islands formed in monolayer titanyl phthalocyanine films2007

    • Author(s)
      T. Sugiyama, et. al.
    • Journal Title

      Chemical Physics Letters 449

      Pages: 319-322

    • Peer Reviewed
  • [Journal Article] Substrate dependent molecular orientation in thin films of bisazomethinedye studied by metastable atom electron spectroscopy and ultraviolet photoelectron spectroscopy2007

    • Author(s)
      T. Hosokai, et. al.
    • Journal Title

      Molecular Crystal and Liquid Crystal 472

      Pages: 43-50

    • Peer Reviewed
  • [Journal Article] The Control of Electronic States Spreading Outside the Conjugated Polymer Surface in Organic Electronics Materials, Devices and Applications2007

    • Author(s)
      X.T. Hao, et. al.
    • Journal Title

      MRS Symposium Proceedings 965E

      Pages: 0965-13-02

    • Peer Reviewed
  • [Journal Article] Multiple Scattering Approach to Polarization Dependence of F K-Edge XANES Spectra for Highly Oriented Polytetrafluoroethylene (PTFE) Thin Film2007

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

      AIP Conference Proceedings 882

      Pages: 514-516

    • Peer Reviewed
  • [Journal Article] Influence of intramolecular vibrations in charge redistribution at the pentacene-graphite interface2007

    • Author(s)
      K. Fujii, et. al.
    • Journal Title

      Surface Science 601

      Pages: 3765-3768

    • Peer Reviewed
  • [Journal Article] Control of the Interchain π-π Interaction and Electron Density Distribution at the Surface of Conjugated Poly (3-hexylthiophe) Thin Films2007

    • Author(s)
      X.T. Hao, et. al.
    • Journal Title

      Journal of Physical Chemistry B 111

      Pages: 10365-10372

    • Peer Reviewed
  • [Journal Article] Preparation Conditions of Pentacene Mnonolayer on Graphite Surface Studied by Photoemisson Electron Microscopy2007

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

      Japanese Journal of Applied Physics 46

      Pages: 1625-1629

    • Peer Reviewed
  • [Journal Article] Angle-resolved UV photoelectron spectroscopy of titanyl phthalocyanine monolayer film on graphite2007

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

      Journal of ElectronSpectroscopy and Related Phenomena 156-158

      Pages: 135-138

    • Peer Reviewed
  • [Journal Article] Photoelectron Angular Distribution of 3d-orbital Dereived Bands in Mn-Phthalocyanine Monolayer2007

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

      UVSOR Activity Report 2006

      Pages: 115

  • [Presentation] Hopping mobility of perfluoropentacene films measured with high-resolution UPS: Impacts of intermolecular interaction on the hole-vibration coupling2007

    • Author(s)
      S. Kera, et. al.
    • Organizer
      Materials Research Society fall meeting 2007
    • Place of Presentation
      Boston (USA)
    • Year and Date
      2007-11-26
  • [Presentation] Work-Function-Dependent Hole Injection Barrier at Organic/Metal Interface: The Role of Band Tailing in Pentacene Aggregates2007

    • Author(s)
      S. Kera, et. al.
    • Organizer
      The 4th Workshop on Advanced Spectroscopy of Organic Materials for Electronic Applications
    • Place of Presentation
      Chiba
    • Year and Date
      2007-10-09
  • [Presentation] High-resolution UPS as a Strategy for Finding an Active Organic Material2007

    • Author(s)
      S. Kera, et. al.
    • Organizer
      The 4th Workshop on Advanced Spectroscopy of Organic Materials for Electronic Applications
    • Place of Presentation
      Chiba
    • Year and Date
      2007-10-08
  • [Presentation] Change in molecular conformation of dibenzo-crown ether on graphite surface studied by u1traviolet photoelectron and metastable atom electron spectroscopy2007

    • Author(s)
      T. Hosokai, et. al.
    • Organizer
      Europiane conference of molecular electronics 2007
    • Place of Presentation
      Metz(France)
    • Year and Date
      2007-09-08
  • [Presentation] Spectroscopic evidence of valence interorbital interaction in a lead-phthal ocyanine bilayer film2007

    • Author(s)
      S. Kera, et. al.
    • Organizer
      The 15th international conference on vacuum ultla violet radiation physics
    • Place of Presentation
      Berlin(Germany)
    • Year and Date
      2007-07-29
  • [Presentation] Direct detection of the gap states in C60 thin films by high-sensitivity UPS2007

    • Author(s)
      T. Sueyoshi, et. al.
    • Organizer
      The 15th international conference on vacuum ultra violet radiation physics
    • Place of Presentation
      Berlin(Gemany)
    • Year and Date
      2007-07-29
  • [Presentation] Charge transport in organic semiconductor film: effects of fluorination on the charge reorganization energy of pentacene2007

    • Author(s)
      S. Kera, et. al.
    • Organizer
      International workshop on Super-functionality organic devices
    • Place of Presentation
      Chiba
    • Year and Date
      2007-07-19
  • [Presentation] Electron-phonon coupling measured with high-resolution UPS: Effects of fluorination on the charge reorganization energy of pentacene films2007

    • Author(s)
      S. Kera, et. al.
    • Organizer
      17th International Vacuum Congress, 13th Internati onal Conference on Surface Science, International Conference on Nano Science and Technology
    • Place of Presentation
      Stockholm(Sweden)
    • Year and Date
      2007-07-04
  • [Presentation] Role of Band Gap States in Pentacene Aggregates: Control of Hole Injec tion Barrier by Fermi-level Pinning2007

    • Author(s)
      S. Kera, et. al.
    • Organizer
      The Fourth International Conference on Molecular Electronics and Bicelectronics
    • Place of Presentation
      Tokyo
    • Year and Date
      2007-03-15
  • [Remarks]

    • URL

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

URL: 

Published: 2010-02-04   Modified: 2016-04-21  

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