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ABSTRACT
In the present study, a LC semiconductor, 2-dodecyl-7-(4-fluorophenyl)-[1] benzothieno[3,2-b][1]benzothiophene (FPh-BTBT-C12) was studied on charge carrier mobility correlated to the mesomorphism. The introduction of a fluorophenyl group on alkyl-BTBT core part leads the higher thermal stability of the mesophase. The observed drift carrier mobility of hole is 0.07 cm2 V−1 s−1 in the lower temperature smectic mesophase by time-of-flight technique. We used FPh-BTBT-C12 solutions (e.g. 0.1 wt% in p-xylene) for forming an organic semiconductor layer by solution casting, and fabricated top-contact/bottom-gate type filed effect transistor devices and its mobility was determined 0.42 cm2 V−1 s−1 at room temperature.
Funding
This research was partly supported by Japanese Society for the Promotion of Science (JSPS) - the National Natural Science Foundation of China (NSFC) Joint Project (No. 50811140156) and the part of this work in China was supported by the National Natural Science Foundation of China (NSFC, contract numbers 51443004 and 51273133).