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HL: Fachverband Halbleiterphysik
HL 6: Organic electronics and photovoltaics (DS with HL/CPP)
HL 6.3: Talk
Monday, March 16, 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.