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  4. Ordering of PCDTBT revealed by time-resolved electron paramagnetic resonance spectroscopy of its triplet excitons
 
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2015
Journal Article
Title

Ordering of PCDTBT revealed by time-resolved electron paramagnetic resonance spectroscopy of its triplet excitons

Abstract
Time-resolved electron paramagnetic resonance (TREPR) spectroscopy is shown to be a powerful tool to characterize triplet excitons of conjugated polymers. The resulting spectra are highly sensitive to the orientation of the molecule. In thin films cast on PET film, the molecules' orientation with respect to the surface plane can be determined, providing access to sample morphology on a microscopic scale. Surprisingly, the conjugated polymer investigated here, a promising material for organic photovoltaics, exhibits ordering even in bulk samples. Orientation effects may significantly influence the efficiency of solar cells, thus rendering proper control of sample morphology highly important.
Author(s)
Biskup, T.
Sommer, M.
Rein, Stefan  
Meyer, D.L.
Kohlstädt, Markus  
Würfel, Uli  
Weber, S.
Journal
Angewandte Chemie. International edition  
DOI
10.1002/anie.201502241
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Solarzellen - Entwicklung und Charakterisierung

  • Farbstoff

  • Organische und Neuartige Solarzellen

  • Organische Solarzellen

  • paramagnetic resonance

  • semiconductors

  • PCDTBT

  • photovoltaics

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