Competing role of quantum localization and interfacial disorder in determining triplet exciton fission and recombination dynamics in polymer/fullerene photovoltaics

Eric R. Bittner

doi:10.1117/12.2064072

9 September 2014 Competing role of quantum localization and interfacial disorder in determining triplet exciton fission and recombination dynamics in polymer/fullerene photovoltaics

Eric R. Bittner

Author Affiliations +

Proceedings Volume 9165, Physical Chemistry of Interfaces and Nanomaterials XIII; 916508 (2014) https://doi.org/10.1117/12.2064072
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

Abstract

Non-geminate charge recombination is a significant source of carrier loss in organic photovoltaic systems. Recent experiments by Rao, et al. (Nature, 2013 500, 435-439) suggest that the recombination of triplet charge-transfer (³CT) states can be suppressed by careful control of the molecular order in the vicinity of the phase boundary between donor and acceptor materials polymer/fullerene bulk-heterojunction devices. In short, recombination of ³CT states is effectively suppressed when the fullerene phase exhibits a high degree of local order near the interface. Here we report upon our theoretical model that connects energetic disorder, dimensionality, and wave function localization to show that inhomogeneous broadening introduces strong coupling between the interfacial ³CT and nearby fullerene triplet excitons and can enhance the decay of these states in systems with higher degrees of energetic disorder.

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Eric R. Bittner "Competing role of quantum localization and interfacial disorder in determining triplet exciton fission and recombination dynamics in polymer/fullerene photovoltaics", Proc. SPIE 9165, Physical Chemistry of Interfaces and Nanomaterials XIII, 916508 (9 September 2014); https://doi.org/10.1117/12.2064072

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