Charge transport in amorphous and smectic mesophases of dicyanovinyl-substituted oligothiophenes†
Abstract
By analyzing electrostatic and polarization effects in amorphous dicyanovinyl-substituted oligothiophenes, we conclude that local molecular dipole moments result in a large, spatially correlated, energetic disorder. This disorder increases with the number of thiophene units in the oligomer and leads to an unexpected reduction of charge carrier mobility in a more ordered (smectic) mesophase, observed for the longest of the studied oligomers (hexamers). This