Orientation-Controlled Growth of Pentacene Single Crystal Films on an Alignment Layer Using Liquid Crystal as Solvent

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Abstract
We found that organic semiconductor pentacene is soluble in some liquid crystal materials with large π-electron conjugated groups. The solubility of pentacene in the heated cyanoterphenyl liquid crystal reached 20 wt%. We considered that both elongated molecular structures of pentacene and liquid crystal produce temporary molecular aggregates in the solution. We also clarified that a large molecular-alignment-controlled thin plate of single crystal pentacene up to 200 µm in length can be grown on a rubbed alignment layer of polyimide when the heated solution film was slowly cooled between glass substrates.