New paper: Triplets meet charges in singlet fission solar cells

Organic electronic devices such as solar cells and light-emitting diodes convert between photons and charges (and vice versa) via intermediate, localized states: the excitons. It is the localized nature of the fundamental electronic excitation of organic semiconductors that make them prone to bimolecular annihilation processes. In this paper, Nanostructured Singlet Fission Photovoltaics Subject to Triplet-Charge Annihilation, we investigate the interaction between triplet excitons and charges (or more precisely polarons) in archetypical, state-of-the-art singlet fission photovoltaic cells. This understanding is crucial because singlet fission, capable of generating multiple excitons per incident photon, solely relies on the formation and consecutive dissociation of long-lived, dark triplet excitons.

 

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