Charge transport property of asymmetric Alkyl-BTBT LC semiconductor possessing a fluorophenyl group

Abstract

ABSTRACTIn 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.