We have characterized the crystallographic features and charge carrier transport properties of polycrystalline films of both triphenylene and terthiophene derivatives, which are representative materials of discotic (disc-like) and calamitic (rod-like) liquid crystals, respectively. Because of the enhanced anisotropy with the hydrocarbon chains in their molecular structure and the pre-ordered molecular alignment in the mesophase, polycrystalline films of liquid crystals, which exhibit a particular texture indicating that the molecular alignment in the liquid-crystalline phase is well preserved, suppresses the formation of grain boundaries across conduction channels and exhibit clear hole transport even in several-µm-thick films. The present results indicate that liquid-crystalline molecules are good candidates for preparing quality organic polycrystalline semiconductor thin films for optoelectronic applications.
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Iino et al. (2006) studied this question.