Charge Transport in Liquid Crystalline Semiconductor and Crosslinked Polymer Composite

Abstract

We have fabricated a novel charge carrier transport material composed of a liquid crystalline molecule and a cross-linked polymer. This composite system exhibited high hole mobility comparable with that of the pure liquid crystalline material. The charge carrier transport properties were influenced by the polymerization temperature, i.e., by the mesophase during polymerization. The hole mobility did not depend on temperature and electric field in the case of polymerized samples in the mesophase. We discussed the carrier transport properties in the polymer composites in comparison with those of the pure liquid crystalline material and the conventional polymer composite of the molecularly doped polymers, in addition to the resulting domain structures in the polymer composites with reference to the carrier transport properties in smectic mesophase as well as in the isotropic phase.