Abstract
Poly(3-octylthienylene vinylene) (O-PTV) has a great potential as low-bandgap p-type semiconductor for photovoltaic applications. Here, the positive radical state (positive polaron) is induced chemically in the O-PTV polymer in which the vinylene sites are selectively 13C-labeled. Using multi-frequency continuous wave and pulsed electron paramagnetic resonance, the g tensor and maximum 1H and 13C hyperfine couplings are determined. A comparative density functional theory (DFT) analysis of PTV-like oligomers is performed. The experimental parameters suggest a larger localization of the positive polaron than follows from the DFT analysis. The counter anion may play a crucial role in localizing the polaron.
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Acknowledgments
Yun Ling thanks the University of Antwerp for PhD funding (BOF-GOA project). S. Van Doorslaer and P. Adriaensens thank the scientific research community project MULTIMAR (Multidisciplinary Magnetic Resonance) of the Research Foundation Flanders (FWO-Vlaanderen) for their support. S. Van Doorslaer acknowledges the support from the Hercules Foundation, Flanders (Contract AUHA013).
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Ling, Y., Diliën, H., Vanderzande, D. et al. Electronic Structure of the Positive Radical of 13C-Labeled Poly(3-Octylthienylene Vinylene) Polymer. Appl Magn Reson 45, 827–839 (2014). https://doi.org/10.1007/s00723-014-0561-3
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DOI: https://doi.org/10.1007/s00723-014-0561-3