Carrier transport characteristics in the SmC, SmF, SmG, and SmC^* phases of self-organizing molecular semiconductor, dialkylterthiophene derivatives

Abstract

We have studied the carrier transport properties in two series of smectic mesophases, from SmA to SmE phases, and from SmC to SmG phases in 2-pahenynaphthalene and terthiophene derivatives by time of flight measurements. With a two-dimensional hoopping transport formalism, we examined the mobility as a function of lhe molecular distance measured by X-ray diffraction and found a good co-relation between them. Thus, the carrier transport characteristics give us another aspect of a probe for elucidating lhe molecular alignment in the smectic layer.