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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session III
CPP 37.19: Poster
Wednesday, April 3, 2019, 11:00–13:00, Poster B1
Ultrafast photophysics of TIPS-tetracenophane — •Clemens Zeiser1, Andreas Göttler2, Luca Moretti3, Margherita Maiuri3, Giulio Cerullo3, Tetsuhiko Nagahara3,4, Holger F. Bettinger2, and Katharina Broch1 — 1Institut für Angewandte Physik, Universität Tübingen, Germany — 2Institut für Organische Chemie, Universität Tübingen, Germany — 3Dipartimento di Fisica, Politecnico di Milano, Italy — 4Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Japan
Singlet exciton fission is a process which could help to improve the power-efficiencies of silicon solar cells by providing a solution to overcome the Shockley-Queisser-Limit. Tetracene is one of the most promising compounds for application as a singlet fission layer [1] and its photophysical properties thus need to be well understood. Chemically linked tetracene dimers [2] provide an opportunity to alter the relative orientation of two tetracene monomers and, thus, to study its influence on the singlet fission time constant. Here we report on the photophysics of the linked TIPS-tetracene dimer TIPS-tetracenophane (TIPS-TCP) [3], where the two tetracene monomers are doubly linked and facing each other directly. Using transient absorption spectroscopy on thin films of TIPS-TCP, we find a singlet lifetime significantly longer than that of tetracene and interpret this finding as an ultrafast creation of a triplet pair state, but a hindered separation of the two triplets.
[1] R. W. MacQueen et. al., Mater. Horiz. 5 (2018) [2] N. V. Korovina et. al., J. Am. Chem. Soc. 140 (2018) [3] H. F. Bettinger et. al., Org. Chem. Front. 4 (2017)