Universal Crossover from Band to Hopping Conduction in Molecular Organic Semiconductors
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- April 2001
- DOI:
- 10.1103/PhysRevLett.86.3843
- Bibcode:
- 2001PhRvL..86.3843S