Universal crossover from band to hopping conduction in molecular organic semiconductors (Retracted Article. See vol 89, ARTN 289902, 2002)

The charge transport in a variety of herringbone-stacked organic molecular semiconductors is investigated in the temperature range from 10 to 550 K. A crossover from coherent bandlike charge transport with mobilities up to several thousand cm(2)/V s at low temperature to an incoherent hopping motion at high temperatures is observed. This is attributed to the localization of the charge carrier due to increased electron-phonon interaction and, finally the formation of a lattice polaron.