High-Voltage Photogeneration Exclusively via Aggregation-Induced Triplet States in a Heavy-Atom-Free Nonplanar Organic Semiconductor

The electron–hole recombination kinetics of organic photovoltaics (OPVs) are known to be sensitive to the relative energies of triplet and charge-transfer (CT) states. Yet, the role of exciton spin in systems having CT states above 1.7 eV—like those in near-ultraviolet-harvesting OPVs—has largely no...

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Bibliographic Details
Published in:Advanced energy materials 2019-11, Vol.9 (48)
Main Authors: Davy, Nicholas C., Koch, Marius, Ngongang Ndjawa, Guy Olivier, Lin, Xin, Man, Gabriel J., Lin, YunHui L., Sorli, Jeni C., Rand, Barry P., Kahn, Antoine, Scholes, Gregory D., Loo, Yueh‐Lin
Format: Article
Language:English
Subjects:
electro-optical materials
ENERGY STORAGE
intersystem crossing
luminescence
Organic electronics
photovoltaic devices
solar cells
triplet excitons
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Summary:The electron–hole recombination kinetics of organic photovoltaics (OPVs) are known to be sensitive to the relative energies of triplet and charge-transfer (CT) states. Yet, the role of exciton spin in systems having CT states above 1.7 eV—like those in near-ultraviolet-harvesting OPVs—has largely not been investigated. Here, aggregation-induced room-temperature intersystem crossing (ISC) to facilitate exciton harvesting in OPVs having CT states as high as 2.3 eV and open-circuit voltages exceeding 1.6 V is reported. Triplet excimers from energy-band splitting result in ultrafast CT and charge separation with nonradiative energy losses of
ISSN:1614-6832
1614-6840