Abstract
The charge transport in α-sexithiophene single crystals was studied by space charge limited current spectroscopy. Hole mobilities as high as 80 cm2/V s were observed at low temperatures. The strong anisotropic conduction in this material is explained by the molecular packing allowing a strong π–π* overlap in the molecular planes due to short sulphur–carbon contacts, but almost no molecular overlap at the ends of the molecules. Therefore, the charge carrier can be described as a two-dimensionally extended polaron, which is localized in one molecular plane but delocalized within this plane. The transport mechanism is governed by two-dimensional band-like motion within the planes and a phonon assisted, thermally activated hopping process perpendicular to them. Furthermore, two different single crystalline modifications have been investigated in order to determine the influence of molecular packing on the charge transport.
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