2007 Fiscal Year Final Research Report Summary
Electron spin resonance study of field-induced charge carriers in organic semiconductor devices
| Project/Area Number |
17340094
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Nagoya University |
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Principal Investigator |
KURODA Shin-ichi Nagoya University, Department of Applied Physim, Professor (20291403)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Hiroshi Nagoya University, Deparlment of Applied Physics, Associate Professor (10260374)
MARUMOTO Kazuhiro University of Tsukuba, Institute of Materials Science, Associate Professor (50293668)
TANAKA Hisaaki Nagoya University, Department of Applied Physics, Assistant Professor (50362273)
SHIMOI Yukihiro National Institute of Advaaced Industrial Science and Technology, Nanotechnology ReseamhInstrlute, Senior Researcher (70357226)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Organic electronics / Organic transistor / Electron spin resonance / polyalkylthionhenes / fullerene / polarons / pentacene / rubrene |
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| Research Abstract |
Organic field-effect devices attract much attention as low-cost electronic devices of the 21st century. Electron spin resonance (ESR) is a powerful technique in caner to clarify directly the properties of charge carders with spins, which manifest the functionalities of those devices.
1.Polymeric materials
Field-induced polaron signals are found by ESR in Metal-Insulator-Semiconductor (MIS) diodes of regioregular polyalkylthiophenes, the conducting polymer with the highest charge carrier mobility. We found the proportionality of spins and charges at lower charge concentration At higher applied voltages, however, the saturation of the spin density occurred, which indicates the transformation of the polarons to spinless bipolarons. The angular dependence of g-values and line widths indicate the edge-on configuration of the polymer chain onto the substrata Then the angular distribution function has been quantitatively analyzed by calculating the anisotropic ESR spectra based on the theoretic
… More
al polaron wave functions. We also succeeded in observing the ambipolar carriers in the composites with fullerene and its derivatives.
2.Molecular materials
Pentacene thin film (1cm2/Us) and rubrene single crystal (10cm2/Us) possess the highest charge carrier mobility among organic materials. Collaborated with Prof. Iwasa's group in Tohoku University, field-induced ESR of pentacene field-effect-transistors (FHIi) is successfully observed. The linewidth indicates the spatial extent of charge carrier over ten molecules, suggesting the band-like transport. From the g-value and linewidth, pi-stacking molecular configuration with respect to the substrate is hind to be preferable fm the high mobility. In pentacene, the induced spin density is always proportional to the carrier density in Clear contrast with the regioregular polyalkyhlvophenes. For the rubrene single crystal, collaboration with Prof. Takeya in Osaka University and Prof. Iwasa's group in Tohoku is underway. Motional narrowing of the ESR signals is Sound, demonstrating the high mobility of the rubrene single crystals Less
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[Journal Article] One-Dimensional Bromo-Bridged NiDI complexes(Ni(S,S-bn)2Br]BIs(S,S-bn=2S,3S-diaminobutane)Synthesis, Physical Properties, and Electrostatic Carrier Doping2008
Author(s)
S. Takaishi, M. Yamashita, H. Matsnraki, H. Okamoto, H. Tanaka S. Kuroda, A. Goto, T. Shimizu, T. Takenobu, Y. Iwasa
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Journal Title
Chem. Eur. J. 14
Pages: 472-477
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Metal-insulator transition of charge transfer salts based on unsymmetrical donor DMET and metal halide anions,(DMET)_4(MC1_4)(TCE)_2(M=Mn, Co, Cu, Zn;TCE=1,1,2-trichloroethane)2007
Author(s)
H. Ito, H. Tanaka, S. Kuroda, M. Umemiya, M. Yamashita, E. Qhmichi, T. Osada, 他
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Journal Title
J. Am. Chem. Soc. 129
Pages: 8510-8518
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Metal-insulator transition of charge transfer salts based on unsymmetrical donor DMET and metal halide anions,(DMET)_4(MC1_4)(TCE)_2(M = Mn, Co, Cu, Zn ; TCE =1,1,2-trichloroethane)2007
Author(s)
H. Ito, D. Suzuki, H. Watanabe, H. Tanaka, S. Kuroda, M. Umemiya, N. Kobayashi, M. Goto, K. Sugiura, H. Miyasaka, S. Takaishi, T. Kajiwara, M. Yamashita, E. Ohmichi, T. Osada
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Journal Title
J. Am. Chem. Soc 129
Pages: 8510-8518
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Metal-Insulator Transition and p-d Interaction of Quasi-1D Organic Conductors (DMET)_4(MCl_4)(TCE)_2(M=Mn,Co,Cu,Zn)2006
Author(s)
H. Ito, H. Tanaka, S. Kuroda, M. Umemiya, M. Yamashita, E. Ohmichi, T. Osada, 他
Organizer
Int. Conf. on Science and Technology of Synthetic Metals 2006(ICSM 2006).
Place of Presentation
Dublin, Ireland
Year and Date
20060702-07
Description
「研究成果報告書概要(和文)」より
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[Presentation] Metal-Insulator Transition and D-d Interaction of Quasi-1D Organic Conductors (DMET)_4(MCL_4)(TCE)_2 (M=Mn_1Co_1Cu_1Zn)2006
Author(s)
H. Ito, D. Suzuki, H. Watanabe, H. Tanaka, S. Kuroda, M. Umemiya, S. Takaishi, H. Miyasaka, K. Sugiura, M. Yamashita, H. Tajima, E. Ohmichi, T. Osada
Organizer
Int. Conf. on Science and Technology of Synthetic Metals (ICSM 2006)
Place of Presentation
Dublin, Ireland
Year and Date
20060702-07
Description
「研究成果報告書概要(欧文)」より
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