Abstract
The intrinsic charge transport mechanism in anthradithiophene single crystals is investigated by temperature dependent space charge limited current spectroscopy. The mobility for in-plane transport in this layered p-type semiconductor exhibits an inverse power law temperature dependence, typical for coherent band-like charge transport. In contrast to that a thermally activated charge transport perpendicular to the molecular planes can be described by incoherent hopping motion. Consequently, the charge carriers (holes) can be characterized as partly delocalized between molecules of a given molecular layer, but localized within individual molecular layers. The results are compared to the related compounds, pentacene and α-sexithiophene, in order to investigate the influence of the sulfur orbitals on hole transport in these and other thiophene-based molecular materials.
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