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TT: Fachverband Tiefe Temperaturen

TT 10: Organic Electronics and Photovoltaics (organized by DS)

TT 10.3: Vortrag

Montag, 16. März 2015, 10:00–10:15, H 2032

Relationship between the chemical structure of low band gap polymers and self-organization properties — •Milutin Ivanovic¹, Umut Aygül¹, Ulf Dettinger¹, Aurelien Tournebize¹, David Batchelor², Stefan Mangold², Heiko Peisert¹, and Thomas Chassé¹ — ¹) University of Tuebingen, Institute of Physical and Theoretical Chemistry, 72076 Tuebingen, Germany — ²Karlsruhe Institute of Technology (KIT), ANKA Synchrotron Radiation Facility, 76344 Eggenstein-Leopoldshafen, Germany

A possible approach to improve the efficiency of donor-acceptor based bulk heterojunction (BHJ) of OPV cells is the use of low band gap (LBG) polymers as donor materials. Basic electronic processes in OPV cells are however strongly influenced by the morphology and the ability for self-organization of the polymers in the thin-films. We utilize NEXAFS spectroscopy to study the molecular orientation of novel LBG polymers (PCPDTTBBTT, PCPDTTBTT and PCPDTzTBTT) for OPVs in thin films. The influence of post-processing annealing as well as of blending with Phenyl-C61-butyric acid methyl ester (PCBM) on the orientation is investigated. The studied LBG polymers are characterized by a variation of (hexyl-) thiophene groups compared to related LBG polymers recently studied.[1,2]. Acknowledgments: This research is funded by the European Union Seventh Framework Programme (FP7/2011 under grant agreement ESTABLIS n° 290022). References: 1.*Aygül, U. et al. J. Phys. Chem. C 2012, 116, 4870-4874. 2.*Aygül, U. et al. Sol. Energ. Mat. Sol. Cells 2014, 128, 119-125.