Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Electrical, Dielectrical and Optical Properties of Thin Films I
CPP 2.1: Talk
Monday, March 12, 2018, 09:30–09:45, C 230
Singlet fission in pentacene blends with tunable charge-transfer interactions — •Katharina Broch1, Johannes Dieterle1, Federico Branchi2, Nicholas Hestand3, Yoann Olivier4, Hiroyuki Tamura5, Chad Cruz6, Valerie Nichols6, Alexander Hinderhofer1, David Beljonne4, Francis Spano3, Giulio Cerullo2, Christopher Bardeen6, and Frank Schreiber1 — 1Universität Tübingen, Tübingen, Germany — 2Politecnico di Milano, Milano, Italy — 3Temple University, Philadelphia, Pennsylvania, USA — 4University of Mons, Mons, Belgium — 5Tokyo University, Tokyo, Japan — 6University of California at Riverside, Riverside, USA
Singlet fission (SF), which transforms an excited singlet state into two triplet states, is receiving increasing attention due to its potential to boost organic solar cell efficiencies [1]. While the key role of intermolecular charge transfer in SF has been demonstrated [2], the impact of reduced intermolecular interactions on SF time scales is not yet fully understood. To gain deeper insight, a continuous modification of the interaction strength between the two extremes of isolated chromophores and single crystals would be valuable, but remains challenging. We demonstrate the possibility to modify charge transfer interactions of pentacene, a prototypical SF material [3], in blends with weakly interacting spacer molecules and discuss the impact on SF time constants in these mixed films.
[1] M. Smith and J. Michl, Chem. Rev. 110 (2010), [2] B. Basel et al., Nat. Comm. 8 (2017), [3] M. Wilson et al., JACS 133 (2010).