Berlin 2012 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 99: Organic Semiconductors: Transport

HL 99.1: Talk

Friday, March 30, 2012, 09:30–09:45, EW 203

Theoretical Studies on the Dynamical Conductivity in Organic Crystals — •André Fischer¹, Frank Ortmann², Friedhelm Bechstedt¹, and Karsten Hannewald¹ — ¹European Theoretical Spectroscopy Facility and Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, Germany — ²Institut Català de Nanotecnologia (ICN), Barcelona, Spain

The theoretical description of charge-transport and excitation properties of organic semiconductors is of crucial importance for the understanding and improvement of organic (opto)electronic devices. As an extension of our previous theories for the static conductivity [1,2], we present here a theory for the dynamical conductivity in organic crystals. Based on the Holstein Hamiltonian, we derive an analytical expression for the temperature-dependent intraband absorption of polarons. The methodological development is supplemented by numerical studies for a 1D model crystal [3] and predictions are made for the expected signatures in corresponding THz experiments.

[1] K. Hannewald et al., Phys. Rev. B 69, 075211 (2004); Phys. Rev. B 69, 075212 (2004); Appl. Phys. Lett. 85, 1535 (2004)

[2] F. Ortmann et al., Phys. Rev. B 79, 235206 (2009); New J. Phys. 12, 023011 (2010); Phys. Stat. Sol. B 248, 511 (2011)

[3] A. Fischer et al. (submitted)