Two-dimensional crystal growth of thermally converted organic semiconductors at the surface of ionic liquid and high-mobility organic field-effect transistors |
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Authors: | Junshi Soeda Toshihiro Okamoto Azusa Hamaguchi Yoshinori Ikeda Hiroyasu Sato Akihito Yamano Jun Takeya |
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Affiliation: | 1. The Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan;2. Integrative Technology Research Institute, TEIJIN LIMITED, 4-3-2 Asahigaoka, Hino, Tokyo 191-8512, Japan;3. Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima, Tokyo 196-8666, Japan |
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Abstract: | We report a novel solution-crystallization method to grow two-dimensional platelet-shaped single-crystals of well-known insoluble organic semiconductors via thermal conversion of their precursor molecules dissolved in ionic liquids (ILs). By optimizing conditions of the crystal growth regarding physical properties of ILs such as density and viscosity, we successfully and reproducibly obtained thin platelets of pentacene and dinaphtho2,3-b:2′,3′-f]thieno3,2-b]thiophene (DNTT) single-crystals, with which nearly the best performing field-effect transistors are constructed for the two compounds. The prompt and simple technique has opened the way to use practically insoluble organic semiconductor materials for high-performance printed electronics, which enables mass-producible and large-area organic circuitry devices. |
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