Bipolar Carrier Transport in Tri-Substituted Octyloxy-Truxene DLC

Abstract

In this study, bipolar charge carrier transport of 2,7,12-trioctyloxytruxene has been studied by a time-of-flight method. The substance studied exhibits a hexagonal columnar mesophase of which melting and clearing points are 118°C and 133°C, respectively. Ambipolar electronic carrier transports were observed in the mesophase. The drift mobility measurements reveal it is in the order of 10−2 cm2 V−1 s−1 in the Colh and it increases to 10−1 cm2 V−1 s−1 at the columnar mesophase - metastable phase transition, indicating truxene is an interesting molecular core for mesophase semiconductors.