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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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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container_issue 48
container_start_page
container_title Advanced energy materials
container_volume 9
creator 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
description 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
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subjects electro-optical materials
ENERGY STORAGE
intersystem crossing
luminescence
Organic electronics
photovoltaic devices
solar cells
triplet excitons
title High-Voltage Photogeneration Exclusively via Aggregation-Induced Triplet States in a Heavy-Atom-Free Nonplanar Organic Semiconductor
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