New possibility for an organic semiconductor: a smectic liquid crystalline semiconductor having a long conjugated core and two long alkyl chains |
| |
| Authors: | Yuichiro Haramoto Yuko Kawada Atushi Mochizuki Masato Nanasawa Seiji Ujiie Masahiro Funahashi |
| |
| Institution: | 1. Department of Applied Chemistry , Yamanashi University , Takeda 4, Kofu 400‐8510, Japan haramoto@ab11.yamanashi.ac.jp;3. Department of Applied Chemistry , Yamanashi University , Takeda 4, Kofu 400‐8510, Japan;4. Department of Applied Chemistry , Oita University , Oita 870‐1192, Japan;5. Tokyo Institute of Technology , Imaging Science and Engneering Laboratory |
| |
| 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). |
| |
| Keywords: | |
|
|
