Abstract
We have studied positive charge carrier transport in each domain of poly domain texture in discotic hexagonal plastic phase of triphenylene derivative, Hexabutyloxytriphenylene (H4T). We observed transient photocurrent with multi-kinks in polydomain texture having large domains over a few mm, some of which indicated a slower transit than that corresponded to the mobility of 10-2 (cm2/Vs) reported previously. It was clearly shown that the mobility in a perfect homeotropic domain is 10-2 (cm2/Vs), on the other hand, that in a tilted domain is 10-3 or 10-4(cm2/Vs) by proving each domain with a selective illumination technique in time-of-flight experiments.
