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2011 Fiscal Year Annual Research Report

有機薄膜・界面構造の精密制御による電子構造と電荷輸送物性の統一的解明

Research Project

Project/Area Number 20245039
Research InstitutionChiba University

Principal Investigator

上野 信雄  千葉大学, 大学院・融合科学研究科, 教授 (40111413)

Keywords有機半導体 / 有機薄膜 / 電荷移動度 / 紫外光電子分光 / 電子状態 / バンドギャップ状態 / 有機単結晶 / ポーラロン
Research Abstract

当初の研究目的に沿って以下の研究成果を得た。
(1)超高感度紫外光電子分光(UPS)による有機半導体薄膜の界面に存在するバンドギャップ準位の測定:これまでに弱い相互作用の電極/有機半導体界面においても有機半導体のバンドギャップ中にフェルミ準位に到達する電子状態が存在し,これが界面電子準位接続を決定していることを見出した。本年度は有機/有機界面でのバンドギャップ状態の高感度測定に成功した。また、薄膜の構造完全性とバンドギャップ状態との相関をX線反射法と光電子分光法で研究し明確な関連を得た。
(2)伝導ホール/分子振動結合の研究:本年度は,高度に秩序化したルブレン単分子膜を高分解能UPSで調べ、電子-格子相互作用の中で大きな寄与が予想される、ホール-局在フォノン(分子振動)結合定数とポーラロン結合エネルギーを実験的に求めることに成功した。
(3)準粒子としてのHOMOホールバンド分散の測定:これまでに光伝導現象を活用して、絶縁性単結晶試料の帯電を防ぐ方法論を開拓してルブレン単結晶の角度分解UPSによるバンド分散測定に成功した。この手法を炭花水素として初めて超伝導が発見されたピセン単結晶へ展開していたが、本年その測定にも成功し、且つ、低速電子回折の測定にも成功した。本実験では、ピセンのバンドギャップより小さい光子エネルギーの光によって光伝導が生じることを見出し、分子エキシトンの励起が光伝導に関与することを突き止めた。尚、関連して全く新しい光電子分光法の可能性を見出している。
本基盤研究(A)によって有機半導体の電気伝導の素過程に関する革新的研究成果が得られた。これらの成果は、多くの国際会議の招待講演の対象となった。

  • Research Products

    (33 results)

All 2012 2011 Other

All Journal Article (12 results) (of which Peer Reviewed: 12 results) Presentation (19 results) Book (1 results) Remarks (1 results)

  • [Journal Article] Charge reorganization energy and small polaron binding energy of rubrene thin films by ultraviolet photoelectron spectroscopy2012

    • Author(s)
      S. Duhm, Q. Xin, S. Hosoumi, H. Fukagawa, K. Sato, N. Ueno, S. Kera
    • Journal Title

      Adv. Mat

      Volume: 27-7 Pages: 901-905

    • DOI

      DOI:10.1002/adma.201103262

    • Peer Reviewed
  • [Journal Article] Electric-field-assisted charge generation and separation process in transition metaloxide-based interconnectors for tandem organic light-emitting diodes2012

    • Author(s)
      J.-P.Yang, Y.Xiao, Y.-H.Deng, S.Duhm, N. Ueno, S.-T.Lee, Y.-Q. Li, J.-X.Tang
    • Journal Title

      Advanced Functional Materials

      Volume: 22(3) Pages: 600-608

    • DOI

      10.1002/adfm.201102136

    • Peer Reviewed
  • [Journal Article] Structure Matters : Correlating Temperature Dependent Electrical Transport Through Alkyl Monolayers with vibrational and Photoelectron Spectroscopies2012

    • Author(s)
      H.Shpaisman, O.Seitz, O.Yaffe, K.Roodenko, L.Scheres, H.Zuilhof, Y.Chabal, T.Sueyoshi, S.Kera, N.Ueno, A.Vilan, D.Cahen
    • Journal Title

      Chemical Science

      Volume: 3 Pages: 851-862

    • DOI

      10.1039/CISC00639H

    • Peer Reviewed
  • [Journal Article] Dielectric properties of polar-phthalocyanine monolayer systems with repulsive dipole interaction2011

    • Author(s)
      H. Fukagawa, S. Hosoumi, H. Yamane, S. Kera, N. Ueno
    • Journal Title

      Phys. Rev. B

      Volume: 83 Pages: 085304-1-8

    • DOI

      DOI:10.1103/PhysRevB.83.085304

    • Peer Reviewed
  • [Journal Article] Tunable two-dimensional molecular dipole dot arrays on graphite2011

    • Author(s)
      TC. Niu, YL. Huang, JT. Sun, S .Kera, N. Ueno, ATS. Wee, W. Chen
    • Journal Title

      Appl. Phys. Lett

      Volume: 99 Pages: 143114-1-3

    • DOI

      DOI:10.1063/1.3647563

    • Peer Reviewed
  • [Journal Article] Impact of Nitrogen Substitution and Molecular Orientation on the Energy Level Alignment of Heteroacene Films2011

    • Author(s)
      Q.Xin, S.Duhm, S.Hosoumi, N.Ueno, X.-T.Tao, S.Kera
    • Journal Title

      J.Phys.Chem.C

      Volume: 115 Pages: 115502-115508

    • DOI

      10.1021/jp204277g

    • Peer Reviewed
  • [Journal Article] Impact of structural imperfection on the energy level alignment in organic films2011

    • Author(s)
      T.Hosokai, H.Machida, S.Kera, A.Gerlach, F.Schreiber, N.Ueno
    • Journal Title

      Phys.Rev.B

      Volume: 83 Pages: 195310-1-7

    • DOI

      10.1103/PhysRevB.83.19S310

    • Peer Reviewed
  • [Journal Article] Impact of alkyl side chains at self-assembly, electronic structure and charge arrangement in sexithiophene thin films2011

    • Author(s)
      S.Duhm, Q.Xin, N.Koch, N.Ueno, S.Kera
    • Journal Title

      Org.Electronics

      Volume: 12 Pages: 903-910

    • DOI

      10.1016.jorgel.2011.03.009

    • Peer Reviewed
  • [Journal Article] 有機半導体の電子状態と界面の特徴:電気伝導の解明へ2011

    • Author(s)
      上野信雄, 解良聡
    • Journal Title

      表面科学

      Volume: 32(1) Pages: 3-8

    • DOI

      10.1380/jsssj.32.3

    • Peer Reviewed
  • [Journal Article] レーザ光同時照射によって可能になった有機半導体単結晶の価電子バンド構造研究2011

    • Author(s)
      中山泰生, 町田真一, Steffen Duhm, Qian Xin, 解良聡, 石井久夫, 上野信雄
    • Journal Title

      レーザ加工学会誌

      Volume: 18(3) Pages: 202-206

    • Peer Reviewed
  • [Journal Article] Photoemission from valence bands of transition metal phthalocyenines2011

    • Author(s)
      M.-H.Shang, M.Nagaosa, S.Nagamatsu, S.Kera, T.Fujikawa, N.Ueno
    • Journal Title

      J.Electron Spectrosc.Relat.Phenom.

      Volume: 184(3-6) Pages: 261-264

    • DOI

      10.1016/j.elspec.2010.10.006

    • Peer Reviewed
  • [Journal Article] Mechanism of the Fermi Level Pinning at Organic Donor-Acceptor Heterojunction Interfaces2011

    • Author(s)
      H.-Y.Mao, F.Bussolotti, D.-C.Qi, R.Wang, S.Kera, N.Ueno, A.T.S.Wee, W.Chen
    • Journal Title

      Org.Electronics

      Volume: 12 Pages: 534-540

    • DOI

      10.1016.j.orgel.2011.01.003

    • Peer Reviewed
  • [Presentation] First-principles experiment on electrical conductivity of organic devices with UPS : Charge delocalization, vibration coupling and band-gap states2012

    • Author(s)
      N.Ueno
    • Organizer
      76th German Physical Society Spring meeting
    • Place of Presentation
      Berlin, Germany(招待講演)
    • Year and Date
      2012-03-29
  • [Presentation] Band dispersion and localized states in organic solids2012

    • Author(s)
      N.Ueno, N.Koch
    • Organizer
      76th German Physical Society Spring meeting : Focused session on Structural ordering and Electronic Transport
    • Place of Presentation
      Berlin, Germany(招待講演)
    • Year and Date
      2012-03-26
  • [Presentation] MnPc薄膜における界面電子状態の空間的広がりの変化2012

    • Author(s)
      米澤恵一朗, 上野信雄, 解良聡
    • Organizer
      第59回応用物理学関係連合講演会
    • Place of Presentation
      早稲田大学(東京)
    • Year and Date
      2012-03-15
  • [Presentation] Hole-Phonon Coupling of Solid Rubrene : Elucidating Hopping Transport by UPS2012

    • Author(s)
      S.Duhm, Q.Xin, S.Hosoumi, H.Fukagawa, K.Sato, N.Ueno, S.Kera
    • Organizer
      International Symposium on Electronic/Optic Functional Molecules (ISEOFM2012)
    • Place of Presentation
      Shanghai, PR China
    • Year and Date
      2012-03-12
  • [Presentation] Ultralow density-of-states in the band gap of organic semicondustors : Their origin and role2011

    • Author(s)
      N.Ueno
    • Organizer
      Electronic Properties of pi-conjugated Materials II
    • Place of Presentation
      Wurzburg, Germany(招待講演)
    • Year and Date
      20110927-20110930
  • [Presentation] Ultralow-density band-gap states in undopod organic semiconductors : Extrinsic vs spontanious effects2011

    • Author(s)
      N.Ueno
    • Organizer
      International Workshop on "Electronic Structure and Processes at Molecular-Based Interfaces" (ESPMI-VI)
    • Place of Presentation
      Karlsruhe, Germany(招待講演)
    • Year and Date
      20110925-20110928
  • [Presentation] ルブレン薄膜の電荷移動に及ぼす分子振動の影響2011

    • Author(s)
      佐藤一至、Steffen Duhm、Qian Xin、細海俊介、西村孝宏、解良聡、上野信雄
    • Organizer
      第5回分子科学討論会
    • Place of Presentation
      札幌(北海道)
    • Year and Date
      20110920-20110923
  • [Presentation] Electronic structure of organic materials and their mysterious hybrids with inorganics : What we know and what we don't know2011

    • Author(s)
      N.Ueno
    • Organizer
      The KOSMOS Summer University 2011 "Frontiers of Organic/Inorganic Hybrid Materials for Electronics and Optoelectronics"
    • Place of Presentation
      Berlin, Germany(招待講演)
    • Year and Date
      20110917-20110925
  • [Presentation] Unraveling mystery in organic devices Direct measurements of ultralow-density band-gap states in organic semiconductors2011

    • Author(s)
      N.Ueno
    • Organizer
      International Workshop on Organic Composite Optoelectronic Materials and Devices (IWOCOMD 2011)
    • Place of Presentation
      Weihai, China(招待講演)
    • Year and Date
      20110804-20110808
  • [Presentation] Influence of Molecular Dipole Moment on the Interface of a N-Heteroacene Thin Film on HOPG2011

    • Author(s)
      Q.Xin, S.Duhm, F.Bussolotti, T.C.Niu,W.Chen, N.Ueno, S.Kera
    • Organizer
      The 6th International Conference on Functional Semicon ductor Interfaces (ICFSI)
    • Place of Presentation
      Prague, Czech Republic
    • Year and Date
      20110703-20110708
  • [Presentation] Thickness Dependent Energy Level Alignment and Fermi Level Pinning Mechanism at Organic Donor-acceptor Interface2011

    • Author(s)
      H.Mao W.Chen, F.Bussolotti, S.Kera, N.Ueno
    • Organizer
      International Conference on Materials for Advanced Technologies (ICMAT2011)
    • Place of Presentation
      Singapore
    • Year and Date
      20110626-20110701
  • [Presentation] Unraveling mysteries in the energy level alignment in organic devices : Detection of ultralow density-of-states in the band gap2011

    • Author(s)
      N.Ueno
    • Organizer
      International Conference on Materials for Advanced Technologies, ICMAT-2011 (Keynote lecture)
    • Place of Presentation
      Suntec, Singapore
    • Year and Date
      20110625-20110701
  • [Presentation] Ultimate use of UPS : Gap states, repulsive interaction and polaron in organic films?2011

    • Author(s)
      N.Ueno
    • Organizer
      International workshop "From vacuum cleaners to organic and molecular electronics"
    • Place of Presentation
      Weizmann Institute of Science, Rehvot, Israel(招待講演)
    • Year and Date
      20110526-20110527
  • [Presentation] Insight into the HOMO-hole in π-conjugated molecules as dielectric medium2011

    • Author(s)
      S.Kera, N.Ueno
    • Organizer
      The 6th Japan-Sweden Workshop on Advanced Spectroscopy of Organic Materials for Electronic Applications (ASOMEA-VI)
    • Place of Presentation
      Ishikawa, Japan
    • Year and Date
      2011-11-25
  • [Presentation] Charge reorganization energy and small polaron binding energy of rubrene thin films by UPS2011

    • Author(s)
      S.Duhm, Q.Xin, S.Hosoumi, H.Fukagawa, K.Sato, N.Ueno, S.Kera
    • Organizer
      The 6th Japan-Sweden Workshop on Advanced Spectroscopy of Organic Materials for Electronic Applications (ASOMEA-VI)
    • Place of Presentation
      Ishikawa, Japan
    • Year and Date
      2011-11-25
  • [Presentation] Investigation of morphology and electronic structures in conjugated polymer films2011

    • Author(s)
      X.Hao, T.A.Smith, K.P.Ghiggino, N.Ueno
    • Organizer
      The 5th VACPS research workshop (Keynote lecture)
    • Place of Presentation
      The University of Melbourne, Australia
    • Year and Date
      2011-11-12
  • [Presentation] Mechanism of the energy level alignment and band bending in organic devices : Why does the Fermi level move in the HOMO LUMO gap?2011

    • Author(s)
      N.Ueno
    • Organizer
      ECI Conference on Carbon-Based Nano-Materials and Devices (Keynote lecture)
    • Place of Presentation
      Suzhou, China
    • Year and Date
      2011-10-17
  • [Presentation] Charge reoiganization energy of rubrene thin films : a photoemission study2011

    • Author(s)
      S.Duhm, Q.Xin, S.Hosoumi, H.Fukagawa, K.Sato, N.Ueno, S.Kera
    • Organizer
      International Workshop on "Electronic Structure and Processes at Molecular-Based Interfaces" (ESPMI-VI)
    • Place of Presentation
      Karlsruhe, Germany
    • Year and Date
      2011-09-25
  • [Presentation] Valence hole-vibration coupling and charge reorganization energy of rubrene thin films on HOPG2011

    • Author(s)
      S.Duhm, S.Hosoumi, Q.Xin, H.Fukagawa, K.Sato, N.Ueno, S.Kera
    • Organizer
      The 6th International Conference on Functional Semicon ductor Interfaces (ICFSI)
    • Place of Presentation
      Prague, Czech Republic
    • Year and Date
      2011-07-03
  • [Book] 有機デバイス・材料の耐久性向上および長寿命化技術2011

    • Author(s)
      上野信雄
    • Total Pages
      19
    • Publisher
      情報機構
  • [Remarks] 上野信雄研究室HP

    • URL

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

URL: 

Published: 2013-06-26  

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