New possibility for an organic semiconductor: a smectic liquid crystalline semiconductor having a long conjugated core and two long alkyl chains |
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| Authors: | Yuichiro Haramoto Yuko Kawada Atushi Mochizuki Masato Nanasawa Seiji Ujiie Masahiro Funahashi Kohki Hiroshima Takamasa Kato |
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| Institution: |
a Department of Applied Chemistry, Yamanashi University, Kofu 400-8510, Japan
b Department of Applied Chemistry, Oita University, Oita 870-1192, Japan
c Tokyo Institute of Technology, Imaging Science and Engneering Laboratory,
d Department of Electrical Engineering, Yamanashi University, Kofu 400-8510, Japan |
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| Abstract: | We report a new possibility for liquid crystalline organic semiconductors. These materials exhibit smectic liquid crystalline phases, in which the molecules assume a smectic molecular order by self-assembly. Because of the strong dispersion force among long alkyl chains, on cooling, smectic molecular order was retained at room temperature. A charge transport ability was also retained. The conductivity of a device having smectic liquid crystalline order is about 5×107 that of a device with no smectic order. The current - voltage characteristic of the device has a very sharp increase at low threshold voltage (5 V). A high carrier mobility of 1.8×10-2 was observed in the smectic phase of one of the compounds studied (e). |
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