Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.44: Poster
Mittwoch, 14. März 2018, 11:00–13:00, Poster A
Efficient doping of poly(3-hexylthiophene) using the strong Lewis acid tris(pentafluorophenyl)borane — •Malavika Arvind1, Patrick Pingel2, Christian Röthel3, Silvia Janietz2, Ingo Salzmann4, and Dieter Neher1 — 1University of Potsdam, Germany — 2Fraunhofer Institute for Applied Polymers, Germany — 3Karl-Franzens Universität Graz, Austria — 4Humboldt Universitaet zu Berlin, Germany
Molecular doping provides a convenient way of improving the conductivity and transport properties of organic materials. In this study, we use tris(pentafluorophenyl)borane (BCF)- a well soluble, strong Lewis acid that is known to serve as a p-dopant[1], to dope the semiconducting polymer poly(3-hexylthiophene) (P3HT). Analysis of the sub-band gap signals in the UV-Vis-NIR spectra of BCF doped P3HT solutions and thin films indicates a doping process similar to that in F4TCNQ-P3HT, despite the obvious structural dissimilarity between the two dopants.[2] However, grazing incidence x-ray diffraction (GIXRD) experiments reveal important differences between the two systems. While co-crystal formation is observed in F4TCNQ-P3HT films[3], such features are absent in the BCF-P3HT system. By employing different techniques for film preparation and doping, we succeeded in fabricating doped films with high structural homogeneity and outstanding electrical conductivities.
[1] Welch et al., J. Am. Chem. Soc., 133 (2011) 4632
[2] Pingel, Arvind et al., Adv. Electron. Mater., (2016) 2: 1600204
[3] Mendez, Salzmann et al. Nat. Comm., (2015), 6, 8560