Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 8: MO Poster 2
MO 8.13: Poster
Tuesday, March 10, 2020, 17:00–19:00, Empore Lichthof
Effect of Chemical Modification and Oxygen Interaction on the Singlet Fission in Azaacene Dimers — •Nicolò Alagna1,2, Jose L.P. Lustres1,2, Sebastian Hahn3, Marcus Motzkus1,2, Uwe H.F. Bunz3, and Tiago Buckup1,2 — 1Physikalisch Chemisches Institut, Ruprecht-Karls University Heidelberg, Germany — 2Centre for Advanced Materials, University of Heidelberg, Germany — 3Organisch Chemisches Institut, Ruprecht-Karls University, Germany
The solar energy conversion in photovoltaics can be enhanced by singlet fission (SF), a carrier multiplication process where two triplet states T1 are generated from one absorbed photon. Studies of phenozinothiadiazole derivatives have shown that morphology, packing and chemical structure play a central role in the SF dynamics. Covalently linked dimers can be employed as a model system to selectively study the intramolecular SF. In this work, time-resolved spectroscopy is used to investigate the effect of chemical modification on the intramolecular singlet fission in three directly linked Azaacene-dimers. The analysis of transient absorption and fluorescence dynamics reveals a complex branching mechanism for the singlet (S1S0) and the correlated triplet pair 1(TT) states. We show that the decay rate and the evolution of the S1S0 and 1(TT) states are strongly dependent on the chemical structure. Moreover, the analysis of deaerated solutions reveals the role of oxygen in altering the 1(TT) dynamics by introducing new decay pathways.