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HL: Fachverband Halbleiterphysik

HL 41: Organic semiconductors

HL 41.1: Talk

Thursday, February 28, 2008, 15:00–15:15, ER 270

Charge transport in guanine crystals — •Frank Ortmann, Karsten Hannewald, and Friedhelm Bechstedt — Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität, Jena, Germany

Charge-transport processes in organic molecular crystals exhibit similarities and differences to those in π-conjugated polymers. For both types of condensed matter the polaronic effects are of outstanding importance. These effects can cause a transition from band-like transport to thermally activated hopping.[1] While the hopping regime is prevalent for DNA polymers, it is not clear if the same holds also for crystaline guanine or if band transport dominates. Also the influence of the temperature is rarely discussed in literature. In our approach to the problem of charge-carrier transport in these systems [2,3], we discuss the temperature dependence of the polaron bandwidth and the mobility in guanine crystals [4].

[1] Hulea et al. Nat. Mater 5 , 982 (2006)

[2] Hannewald et al. PRB 69 , 075211 (2004)

[3] Hannewald et al. PRB 69 , 075212 (2004)

[4] Ortmann et al. J. Phys. Chem. B (to be published)