Electronic state control of highly-crystalline organic semiconductor thin films by carrier injection: toward developing novel electronic functions
| Project/Area Number |
26400315
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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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 |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 有機半導体 / 導電性高分子 / 有機薄膜トランジスタ / キャリアドーピング / 電子スピン共鳴 / 有機トランジスタ / 有機発光素子 / 金属-絶縁体転移 |
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| Outline of Final Research Achievements |
Electronic states and transport mechanisms of charge carriers in thin-film transistors (TFTs) of organic semiconductors have been investigated microscopically by using electron spin resonance spectroscopy. We designed a TFT structure with an ionic-liquid gate insulator, which enabled the high-density carrier injection, in order to control the electronic state of conducting polymers with high crystallinity. In highly-doped polymer films, we clearly demonstrated the formation of metallic state in crystalline regions, whereas the macroscopic conductivity showed semiconducting behavior at low temperatures due to the effect of traps. In the case of TFTs using thienothiophene-based small molecules as high-mobility semiconductors and solid gate insulators, presence of highly mobile carriers down to 4 K was demonstrated within the crystalline grain, whereas the macroscopic conductivity was limited by the carrier trapping at the grain boundaries.
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Report
(4 results)
Research Products
(32 results)
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[Journal Article] Two-Dimensional Coherent Charge Transport in Highly Ordered Conducting Polymers Doped by Solid State Diffusion2016
Author(s)
K. Kang, S. Watanabey, K. Broch, A. Sepe, A. Brown, I. Nasrallah, M. Nikolka, Z. Fei, M. Heeney, D. Matsumoto, K. Marumoto, H. Tanaka, S. Kuroda, and H. Sirringhaus
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Journal Title
Nature Mater.
Volume: in press
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Optically visible phase separation between Mott-Hubbard and charge-density-wave domains in a Pd-Br chain complex2016
Author(s)
T. Yoshida, S. Takaishi, H. Iguchi, H. Okamoto, H. Tanaka, S. Kuroda, Y. Hosomi, S. Yoshida, H. Shigekawa, T. Kojima, H. Ohtsu, M. Kawano, B. K. Breedlove, L. Gué rin, and M. Yamashita
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Journal Title
ChemistrySelect
Volume: 2
Issue: 2
Pages: 259-263
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] ESR Observations of Charge Carrier Dynamics2017
Author(s)
S. Kawamura, A. Wakamatsu, H. Tanaka, and T. Takenobu
Organizer
The 6th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies
Place of Presentation
Fukui
Year and Date
2017-06-18
Related Report
Int'l Joint Research
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