Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,
DS 29.36: Poster
Wednesday, March 24, 2010, 15:00–17:30, Poster A
Correlation of morphology, cell architecture and device performance in P3HT/fullerene based organic solar cells — •Ulrich Hörmann1, Julia Wagner1, Andreas Opitz1, Wolfgang Brütting1, and Ellen Moons2 — 1Institute of Physics, University of Augsburg, Germany — 2Department of Physics, Karlstad University, Sweden
The material combination of the polymer poly(3-hexylthiophene) (P3HT) and the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is one of the most widespread donor-acceptor systems in organic photovoltaics. In the present work these materials as well as the buckminsterfullerene C60 are studied in three different device architectures: the bulk heterojunction, the planar heterojunction and the diffuse heterojunction, which can be considered as a combination of both.
Planar heterojunctions are achieved by evaporation of either C60 or PCBM onto a spin-coated P3HT layer. Heating the P3HT film to an appropriate temperature during the evaporation process enables the C60 molecules to penetrate into the polymer layer, representing a new technique of producing diffuse donor-acceptor interfaces. Preparation of diffuse heterojunctions with PCBM can be achieved by means of spin coating while partly dissolving the underlying P3HT. Morphological investigations of the resulting layers have been performed by scanning force microscopy as well as optical and fluorescence microscopy and emphasize the importance of morphology and device architecture for the performance of organic photovoltaic cells.