Study on charge transport mechanism and related dynamics of molecular solids

2010 Fiscal Year Final Research Report

• Project/Area Number: 20685014
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Functional materials/Devices
• Research Institution: Chiba University
• Principal Investigator: SATOSHI Kera Chiba University, 大学院・融合科学研究科, 准教授 (10334202)
• Project Period (FY): 2008 – 2010
• Keywords: 表面界面 / 有機半導体 / 電子分光 / 薄膜 / 分子配向 / 移動度 / 相互作用

Research Abstract

We have investigated the peculiar opto/electric properties seen in organic semiconductor molecular solids by observing the interface electronic structure. The main aim is to describe the carrier motion in the molecular aggregate, which will be connected by a weak-intermolecular interaction, with the electronic theory. By measuring the photoelectron spectrum very precisely, we could address directly the important factors of the charge transport mechanism, ie., band-gap state, reorganization energy, and transfer integral, and have had a deeper knowledge on the mechanism successfully.

Research Products

• [Journal Article] Orientational ordering of non-planar phthalocyanines on Cu(111) : Strength and orientation of the electric dipole moment (2011)
  • Author(s): A.Gerlach, T.Hosokai, S.Duhm, S.Kera, 他4名
  • Journal Title: Phys.Rev.Lett. 106 Pages: "156102-1"-"156102-4"
  • Peer Reviewed
• [Journal Article] Dielectric properties of polar-phthalocyanine monolayer systems with repulsive dipole interaction (2011)
  • Author(s): H.Fukagawa, S.Hosoumi, H.Yamana, S.Kera, N.Ueno
  • Journal Title: Phys.Rev.B 83 Pages: "085304-1"-"085304-8"
  • Peer Reviewed
• [Journal Article] Impact of alkyl side chains at self-assembly, electronic structure and charge arrangement in sexithiophene thin films (2011)
  • Author(s): S.Duhm, Q.Xin, N.Koch, N.Ueno, S.Kera
  • Journal Title: Org.Electronics. 12 Pages: 903-910
  • Peer Reviewed
• [Journal Article] Mechanism of the Fermi Level Pinning at Organic Donor-Acceptor Heterojunction Interfaces (2011)
  • 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 12 Pages: 534-540
  • Peer Reviewed
• [Journal Article] Observation and Analysis of Small Inclination of Thymine Molecules on Graphite (2011)
  • Author(s): A.Habib, T.Hosokai, N.Mitsuo, R.Nakagawa, S.Nagamatsu, M.Aoki, S.Masuda, S.Kera, N.Ueno
  • Journal Title: J.Phys.Chem.C 115 Pages: 511
  • Peer Reviewed
• [Journal Article] Impact of structural imperfection on the energy level alignment in organic films (2011)
  • Author(s): T.Hosokai, H.Machida, A.Gerlach, S.Kera, F.Schreiber, N.Ueno
  • Journal Title: Phys.Rev.B 83 Pages: "195310-1"-"195310-7"
  • 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 32(1) Pages: 3-8
  • Peer Reviewed
• [Journal Article] One dimensional molecular dipole chain arrays on graphite via nanoscale phase separation (2010)
  • Author(s): Y.L.Huang, R.Wang, T.C.Niu, S.Kera, N.Ueno, J.Pflaum, A.T.S.Wee, W.Chen
  • Journal Title: Chem.Commun. 46 Pages: 9040-9042
  • Peer Reviewed
• [Journal Article] Band gap states in copper phthalocyanine thin films induced by N2 exposure (2010)
  • Author(s): T.Sueyoshi, H.Kakuta, M.Ono, K.Sakamoto, S.Kera, N.Ueno
  • Journal Title: Appl.Phys.Lett(selected as APL: Organic Electronics and Photonics, March (2010)) 96 Pages: 093303-1-3
  • Peer Reviewed
• [Journal Article] Highest-Occupied-Molecular-Orbital Band Dispersion of Rubrene Single Crystals as Observed by Angle-Resolved Ultraviolet Photoelectron Spectroscopy (2010)
  • Author(s): S.Machida, S.Kera, N.Ueno, H.Ishii, 他5名
  • Journal Title: Phys.Rev.Lett. 104 Pages: "156401-1"-"156401-4"
  • Peer Reviewed
• [Journal Article] Influence of intramolecular polar bonds on interface energetics in perfluoro-pentacene on Ag(111) (2010)
  • Author(s): S.Duhm, S.Hosoumi, I.Salzmann, A.Gerlach, M.Oehzelt, B.Wedl, T-L.Lee, F.Schreiber, N.Koch, N.Ueno, S.Kera
  • Journal Title: Phys.Rev.B 81 Pages: 045418
  • Peer Reviewed
• [Journal Article] Thickness-dependent electronic properties and molecular orientation of diradical metal complex thin films grown on SiO_2 (2010)
  • Author(s): T.Hosokai, N.Mitsuo, S.Noro, T.Nakamura, S.Kera, K.Sakamoto, N.Ueno
  • Journal Title: Chem.Phys.Lett. 487 Pages: 67-70
  • Peer Reviewed
• [Journal Article] Improved Hole-Injection Efficiency by the Deposition of MoO_3 on the Polymeric Semiconductor Poly(dioctylfluorene-alt-benzothiadiazole) (2009)
  • Author(s): Y.Nakayama, S.Kera, N.Ueno, H.Kitagawa, H.Ishi, 他4名
  • Journal Title: Adv.Func.Mater. 19(23) Pages: 3746-3752
  • Peer Reviewed
• [Journal Article] Low-density band-gap states in pentacene thin films probed with ultrahighsensitivity ultraviolet photoelectron spectroscopy (2009)
  • Author(s): T.Sueyoshi, H.Fukagawa, M.Ono, S.Kera, N.Ueno
  • Journal Title: Appl.Phys.Lett 95 Pages: "183303-1"-"183303-3"
  • Peer Reviewed
• [Journal Article] Vibrational Properties of Perfluoropentacene Thin Film (2009)
  • Author(s): H.Fujii, C.Himcinschi, M.Toader, S.Kera, D.R.T.Zahn, N.Ueno
  • Journal Title: J.Electron Spectrosc.Relat.Phenom. 174 Pages: 65-69
  • Peer Reviewed
• [Journal Article] First principles measurements of charge mobility in organic semiconductors : Valence hole-vibration coupling in organic ultrathin films (2009)
  • Author(s): S.Kera, H.Yamane, N.Ueno
  • Journal Title: Prog.Surf.Sci.(Progress Highlight) 84 Pages: 135-154
  • Peer Reviewed
• [Presentation] Ultraviolet Photoelectron Spectroscopy for Molecular Superstructures (2011)
  • Author(s): S.Kera
  • Organizer: G-COE International Workshop on Organic Interfaces and Related Phenomena[依頼口頭]
  • Place of Presentation: Chiba
  • Year and Date: 2011-01-28
• [Presentation] Photoelectron spectroscopy for Electronic Properties of Organic Semiconductor Solids, COE Start-up International Workshop (2010)
  • Author(s): S.Kera
  • Organizer: Organic Semiconductors Towards the Next[口頭]
  • Place of Presentation: Chiba
  • Year and Date: 20101111-20101113
• [Presentation] Electronic Properties of Organic Semiconductor Single Crystal (2010)
  • Author(s): S.Kera
  • Organizer: Asian conference on organic electronics (A-COE) and Asian Symposium on Organic Materials for Electronics and Photonics (ASOMEP)[招待講演]
  • Place of Presentation: Seoul, Korea
  • Year and Date: 20101103-20101105
• [Presentation] Energy-band dispersion of rubrene single crystal : ARUPS study (2010)
  • Author(s): S.Kera, S.Machida, Y.Nakayama, A.Funakoshi, N.Ogawa, S.Hosoumi, Q.Xin, S.Duhm, H.Ishii, N.Ueno
  • Organizer: 18th international vacuum congress (IVC-18)[口頭]
  • Place of Presentation: Beijing
  • Year and Date: 20100823-20100827
• [Presentation] Interface electronic structure of Co-phthalocyanine/Cu(111) (2010)
  • Author(s): S.Kera, R.Tateishi, S.Hosoumi, H.Machida, T.Aoki, S.Nagamatsu, N.Ueno
  • Organizer: 18th international vacuum congress (IVC-18)[ポスター]
  • Place of Presentation: Beijing
  • Year and Date: 20100823-20100827
• [Presentation] Photoelectron spectra of thin film and single crystalline phase of rubrene (2010)
  • Author(s): S.Kera, S.Machida, Y.Nakayama, A.Funakoshi, N.Ogawa, S.Hosoumi, Q.Xin, S.Duhm, H.Ishii, N.Ueno
  • Organizer: 37th International Conference on Vacuum Ultraviolet and X-ray Physics[ポスター]
  • Place of Presentation: Vancouver, Canada
  • Year and Date: 20100711-20100717
• [Presentation] 有機半導体の電気的性質:光電子分光法による直接評価,日本化学会関東支部講演会「有機-金属界面と電気伝導」 (2010)
  • Author(s): 解良聡
  • Organizer: 日本化学会7階ホール[依頼口頭]
  • Place of Presentation: 神田
  • Year and Date: 2010-11-01
• [Presentation] Photoelectron spectroscopy of molecular assembly : Bridging electronic structure and hole transport property (2009)
  • Author(s): S.Kera
  • Organizer: The 6th Singapore International Chmical Conference (SICC6) Symposium : Organic & Graphene Electronics[招待講演]
  • Place of Presentation: Singapore
  • Year and Date: 20091215-20091218
• [Presentation] Impacts of molecule-substrate interaction on electron/spin configuration of transition-metal phthalocyanines (2009)
  • Author(s): S.Kera, T.Aoki, S.Hosoumi, S.Nagamatsu, N.Ueno
  • Organizer: International Conference on Electronic Spectroscopy and Structure (ICESS11)[口頭]
  • Place of Presentation: Nara
  • Year and Date: 20091106-20091109
• [Presentation] Ultraviolet photoelectron spectroscopy of organic molecular assembly : Bridging electronic structure and hole transport property (2009)
  • Author(s): S.Kera
  • Organizer: G-COE Workshop on Organic Electronics : Electronic states, charge transport and devices[招待講演]
  • Place of Presentation: Chiba
  • Year and Date: 20091105-20091106
• [Presentation] Spin-Polarized Electronic States of Mn-phthalocyanine Ultrathin Films by Ultraviolet Photoelectron Spectroscopy (2009)
  • Author(s): S.Kera, T.Aoki, S.Hosoumi, S.Nagamatsu, N.Ueno
  • Organizer: The 8th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2009), The 64th Yamada Conference[ポスター]
  • Place of Presentation: Niseko
  • Year and Date: 20090912-20090917
• [Presentation] Hole Mobility of Organic Solids : Direct Evaluation by Photoelectron Spectroscopy (2009)
  • Author(s): S.Kera
  • Organizer: 12th International Conference on the Formation of Semiconductor Interfaces (ICFSI12)[招待講演]
  • Place of Presentation: Weimer,Germany
  • Year and Date: 20090705-20090710
• [Remarks] ホームページ:
  • URL: http://ulab-www.tf.chiba-u.jp/
• [Remarks]
  • URL: http://www.gcoe.tf.chiba-u.jp/
• [Remarks] (報道情報資料)
  • URL: http://www.gcoe.tf.chiba-u.jp/press_release_rubrene_single_crystals.pdf