Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 39: Poster Session II

DS 39.27: Poster

Thursday, March 19, 2015, 16:00–18:30, Poster F

Exciton transport in small molecules: Hopping activated and saturated regime — •Bernhard Siegmund, Johannes Widmer, Simone Hofmann, Christian Körner, Koen Vandewal, and Karl Leo — Institut für Angewandte Photophysik, Dresden, Germany

Organic solar cells offer the prospect for a low-cost production on flexible substrates. Cascade structures of neat absorber layers have recently proven to be a convincing concept for efficient exciton harvesting with power conversion efficiencies comparable to those of established tandem devices. Enhanced diffusion lengths of excitons would provide further improvements in terms of higher short-circuit currents. In order to get insights into exciton diffusion, we study the temperature behavior of the diffusion length in the red absorber ZnPc and in the fluorescent blue emitter 4P-NPD. We find two different mechanisms dominating exciton transport.