Universal Crossover from Band to Hopping Conduction in Molecular Organic Semiconductors

Jan Hendrik Schön; Christian Kloc; Bertram Batlogg

doi:10.1103/PhysRevLett.86.3843

Universal Crossover from Band to Hopping Conduction in Molecular Organic Semiconductors

Jan Hendrik Schön, Christian Kloc, and Bertram Batlogg

Phys. Rev. Lett. 86, 3843 – Published 23 April 2001; Retraction Phys. Rev. Lett. 89, 289902 (2002)

Abstract

This article has been retracted: see Phys. Rev. Lett. 89, 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.