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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 29.29: Poster
Mittwoch, 24. März 2010, 15:00–17:30, Poster A
DIP based organic photovoltaic cells with high fill factor and high open circuit voltage — •Mark Gruber, Julia Wagner, Andreas Opitz, and Wolfgang Brütting — Institute of Physics, University of Augsburg, Germany
The p-type semiconductor Diindenoperylene (DIP) was used as a donor material in combination with the acceptor C60 for the application in planar and bulk heterojunction organic solar cells. The favourable molecular energy level alignment mainly affected by the low lying HOMO of DIP results in high open circuit voltages of up to 0.94 V under 100 mW/cm2 simulated AM1.5 illumination. DIP shows comparatively low absorption coefficients which can be attributed to predominantly upright standing molecules leading to unfavourable orientation of the optical transition dipole. Nevertheless, the high open circuit voltages together with remarkably high fill factors of around 74% - approaching those of silicon solar cells show great promise for highly efficient photovoltaic cells.
Morphological investigations demonstrate strong dependence of the growth behaviour on substrate temperature. By varying the growth conditions large variations in crystallinity are observed and are related to solar cell performance. Thus, dependent on the substrate temperature the shape of the current-voltage curve changes from distinct s-shape to nearly perfect diode characteristics.