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Ordering of PCDTBT Revealed by Time‐Resolved Electron Paramagnetic Resonance Spectroscopy of Its Triplet Excitons
Author(s) -
Biskup Till,
Sommer Michael,
Rein Stephan,
Meyer Deborah L.,
Kohlstädt Markus,
Würfel Uli,
Weber Stefan
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201502241
Subject(s) - electron paramagnetic resonance , exciton , materials science , spectroscopy , polymer , organic solar cell , photovoltaics , molecule , conjugated system , thin film , electron , chemical physics , chemistry , nanotechnology , nuclear magnetic resonance , condensed matter physics , physics , organic chemistry , photovoltaic system , ecology , quantum mechanics , composite material , biology
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.