Structural analysis of C8BTBT single crystalline films using homogeneous-aligned liquid crystal solvent

Abstract

Control of molecular orientation in single crystalline films is one of challenges for printed organic thin film transistors for flexible liquid crystal displays. To overcome this issue, we focused on directional control of single crystalline films using liquid crystal solvent. Previously, we achieved fabrication of single crystalline films based on benzothienobenzothiophene derivatives (C8BTBT). However, their crystal structure is not cleared. In this study, we discuss the relationship between aligned liquid crystal and analyzed their single crystalline structure. As the results, we clarified that direction of crystalline b-axis is aligned to rubbing-treated direction due to parallel-aligned liquid crystals.