Carrier Transport and Doping Effect in Discotic Liquid Crystal

Abstract

Carrier transport of 2,3,6,7,10,11-hexahexyloxytriphenylene (HHOTP) in the discotic phase and the effects of C₆₀ doping have been studied by a time of flight method. C₆₀ is well known to capture electrons effectively. Relatively high mobility of positive carriers insensitive to temperature and also C₆₀ doping are interpreted to be hole mobility. Small and temperature dependent mobility (with activation energy of 0.3 eV) of negative carriers which are influenced slightly by C₆₀ doping is interpreted to be that of ionic carriers.