Berlin 2012 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 24: Poster: Organic Semiconductors
CPP 24.26: Poster
Wednesday, March 28, 2012, 11:00–13:00, Poster A
The influence of voltage bias on charge carrier generation and recombination processes in oligothiophene-based organic solar cells — •Christian Koerner1, Hannah Ziehlke1, Roland Fitzner2, Egon Reinold2, Peter Bäuerle2, Karl Leo1, and Moritz Riede1 — 1Institut für Angewandte Photophysik, TU Dresden, Dresden, Germany — 2Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Ulm, Germany
Dicyanovinyl end-capped oligothiophenes (DCVnT) have demonstrated their ability of achieving high power conversion efficiencies of up to 7.0% in a bulk heterojunction solar cell. Additionally, they act as an excellent model system to investigate the influence of systematical changes to the molecular structure on the thin film properties.
We use a sexithiophene derivative to investigate the influence of voltage bias on the charge generation and recombination processes in bulk heterojunction solar cells. Therefore, we combine the normal IV measurement with photoinduced absorption (PIA) spectroscopy. Using this method, we can investigate the long-living (μs-ms) excited species present after photoexcitation of DCV6T:C60 blends acting as photo-active layers in complete and working devices. With PIA, the generation and recombination behaviour of charged molecular states (polarons) are subsequently investigated for various voltage bias and illumination intensities.