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Molecular Crystals and Liquid Crystals Volume 545, 2011 - Issue 1: Proceedings of the 23rd International Liquid Crystal Conference (ILCC 2010) Part VI of VIII
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Discotic, Ionic, Dendrimeric LCs

Bipolar Carrier Transport in Tri-Substituted Octyloxy-Truxene DLC

H. Monobe Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), Midorigaoka, Ikeda, Osaka, JapanCorrespondence[email protected]
,
C. Chen College of Chemistry and Materials Science, Shichuan Normal University, Chengdu, Shichuan, China
,
K.-Q. Zhao College of Chemistry and Materials Science, Shichuan Normal University, Chengdu, Shichuan, China
,
P. Hu College of Chemistry and Materials Science, Shichuan Normal University, Chengdu, Shichuan, China
,
Y. Miyake Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), Midorigaoka, Ikeda, Osaka, Japan; Graduate School of Engineering, Osaka University, Yamada-oka, Suita, Osaka, Japan
,
A. Fujii Graduate School of Engineering, Osaka University, Yamada-oka, Suita, Osaka, Japan
,
M. Ozaki Graduate School of Engineering, Osaka University, Yamada-oka, Suita, Osaka, Japan
&
Y. Shimizu Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), Midorigaoka, Ikeda, Osaka, Japan
 show all
Pages 149/[1373]-155/[1379] | Published online: 30 Jun 2011
 
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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.

Acknowledgment

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).

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