Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.8: Poster

Montag, 14. März 2011, 17:30–19:30, P2

Morphological and Photophysical Characterisation of Novel Absorber Materials for Organic Solar Cells — •Hannah Mangold¹, Silvia Janietz², Ingo Lieberwirth¹, Michael Meister¹, Ian H. Howard¹, and Frédéric Laquai¹ — ¹Max-Planck-Institut für Polymerforschung, Mainz, Germany — ²Fraunhofer Institut für Angewandte Polymerforschung, Potsdam, Germany

In this contribution new tailor-made fluorene based terpolymers are investigated as absorber materials in organic solar cells. These terpolymers contain different contents of dialkyl-substituted diphenyl-benzopyrazine or diphenyl-thienopyrazine and triphenylamine units and possess bandgaps between 1.3 and 1.8 eV. Power conversion efficiencies up to 3% with open circuit voltages close to 1 V are obtained in blends with [6,6]-phenyl C61 butyric acid methyl ester (PCBM) even without prior thermal treatment. The morphology of the blends is investigated by atomic force microscopy (AFM) and transmission electron microscopy (TEM) and correlated with the results obtained from I-V-measurements under simulated sunlight. Photophysical experiments such as steady-state photoinduced absorption (PIA) and transient absorption (TA) spectroscopy are employed to understand the effect of variation of the polymer structure on exciton dissociation and charge recombination. Using a combination of these methods the understanding of the structure-property-relationship of these materials is extended towards the molecular scale and the impact of molecular structure and processing conditions on charge generation, transport and recombination processes can be elucidated.