For directional control of organic single crystals, we propose a crystal growth method using liquid crystal as the solvent. In this study, we examined the formation of 2,7-dioctylbenzothieno[3,2-b]benzothiophene (C-BTBT) single crystals using a parallel aligned liquid crystal (LC) cell and rubbing-treated polyimide films in order to clarify the effects of LC alignment on anisotropic C-BTBT crystal growth. Based on the results, we found that the crystal growth direction of C-BTBT single crystals was related to the direction of the aligned LC molecules because of rubbing treatment. Moreover, by optical evaluation, we found that the C-BTBT single crystals have a aligned molecular structure.
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