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Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells

Yifan Dong, Hyojung Cha, Helen L. Bristow, Jinho Lee, Aditi Kumar, Pabitra Shakya Tuladhar, Iain McCulloch, Artem A. Bakulin, James Durrant Orcid Logo

Journal of the American Chemical Society, Volume: 143, Issue: 20, Pages: 7599 - 7603

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1021/jacs.1c00584

Abstract

Minimizing the energy offset between the lowest exciton and charge-transfer (CT) states is a widely employed strategy to suppress the energy loss (Eg/q – VOC) in polymer:non-fullerene acceptor (NFA) organic solar cells (OSCs). In this work, transient absorption spectroscopy is employed to determine...

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Published in: Journal of the American Chemical Society
ISSN: 0002-7863 1520-5126
Published: American Chemical Society (ACS) 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa57798
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Abstract: Minimizing the energy offset between the lowest exciton and charge-transfer (CT) states is a widely employed strategy to suppress the energy loss (Eg/q – VOC) in polymer:non-fullerene acceptor (NFA) organic solar cells (OSCs). In this work, transient absorption spectroscopy is employed to determine CT state lifetimes in a series of low energy loss polymer:NFA blends. The CT state lifetime is observed to show an inverse energy gap law dependence and decreases as the energy loss is reduced. This behavior is assigned to increased mixing/hybridization between these CT states and shorter-lived singlet excitons of the lower gap component as the energy offset ΔECT-S1 is reduced. This study highlights how achieving longer exciton and CT state lifetimes has the potential for further enhancement of OSC efficiencies.
Item Description: Accepted version available at https://spiral.imperial.ac.uk/handle/10044/1/89379
Keywords: Colloid and Surface Chemistry, Biochemistry, General Chemistry, Catalysis
College: College of Engineering
Funders: Engineering and Physical Sciences Research Council Grant: EP/T026219/1 Grant: EP/TO28513/1 Identifier: FundRef 10.13039/501100000266 UK Research and Innovation Grant: EP/P032591/1 Identifier: FundRef 10.13039/100014013 King Abdullah University of Science and Technology Grant: OSR-2015-CRG4-2572 Grant: OSR-2018-CRG/CCF-3079 Grant: OSR-2018-CRG7-3749 Grant: OSR-2018-CRG7-3749.2 Grant: OSR-2019-CRG8-4086 Identifier: FundRef 10.13039/501100004052 H2020 European Research Council Grant: n?862474 Grant: n?952911 Identifier: FundRef 10.13039/100010663
Issue: 20
Start Page: 7599
End Page: 7603