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Abstract
We have investigated the charge transport properties in smectic photoconductive liquid crystal of 2-phenylnaphthalene derivatives in focus on the electrical nature of the boundaries at the phase transition from liquid crystalline phase into the crystal phase. With systematic studies of charge transport and collection by transient photocurrent measurements and molecular alignment by X-ray diffraction at the phase transition, it was revealed that the defective nature of the crystalline boundaries takes the shape of shallow traps at the initial stage and of deep traps successively, and finally the polydomain allowance for the carrier transport in mesophases disappears completely when the phase transition takes place into the crystalline phases.