Berlin 2012 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 58: Focus Session: Structure and Transport in Organic Photovoltaics III (jointly with CPP)

HL 58.8: Talk

Wednesday, March 28, 2012, 16:45–17:00, ER 270

Anisotropy of charge and exciton transport in organic semiconductors — •Vera Stehr¹, Reinhold Fink², Johannes Pfister², Bernd Engels³, and Carsten Deibel¹ — ¹Physikalisches Institut, Universität Würzburg, 97074 Würzburg — ²Institut für Physikalische und Theoretische Chemie, Universität Tübingen, 72076 Tübingen — ³Institut für Physikalische und Theoretische Chemie, Universität Würzburg, 97074 Würzburg

Organic solar cells become more and more interesting for applications due to their low production costs and easy processability. In order to increase their efficiency it is very important to understand the basic principles of charge and exciton transport in these materials. The charge carrier mobility and the exciton diffusion length are the crucial material parameters which decide on the applicability for solar cells. The transport properties and their orientational dependency have been studied theoretically by means of quantum chemical methods and a hopping approach using Marcus theory along with the master equation. This approach is straightforward and is shown to provide qualitatively good results concerning the directional and morphological dependency of the transport parameters.