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The role of charge ...
The role of charge recombination to triplet excitons in organic solar cells
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- Gillett, Alexander J. (author)
- Univ Cambridge, England
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- Privitera, Alberto (author)
- Univ Oxford, England
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- Dilmurat, Rishat (author)
- Univ Mons, Belgium
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- Karki, Akchheta (author)
- Univ Calif Santa Barbara, CA 93106 USA
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- Qian, Deping (author)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten
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- Pershin, Anton (author)
- Univ Mons, Belgium; Wigner Res Ctr Phys, Hungary
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- Londi, Giacomo (author)
- Univ Mons, Belgium
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- Myers, William K. (author)
- Univ Oxford, England
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- Lee, Jaewon (author)
- Univ Calif Santa Barbara, CA 93106 USA; Chungnam Natl Univ, South Korea
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- Yuan, Jun (author)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten,Cent South Univ, Peoples R China
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- Ko, Seo-Jin (author)
- Univ Calif Santa Barbara, CA 93106 USA; Korea Res Inst Chem Technol, South Korea
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- Riede, Moritz K. (author)
- Univ Oxford, England
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- Gao, Feng (author)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten
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- Bazan, Guillermo C. (author)
- Univ Calif Santa Barbara, CA 93106 USA
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- Rao, Akshay (author)
- Univ Cambridge, England
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- Nguyen, Thuc-Quyen (author)
- Univ Calif Santa Barbara, CA 93106 USA
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- Beljonne, David (author)
- Univ Mons, Belgium
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- Friend, Richard H. (author)
- Univ Cambridge, England
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(creator_code:org_t)
- 2021-09-29
- 2021
- English.
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In: Nature. - : NATURE PORTFOLIO. - 0028-0836 .- 1476-4687. ; 597:7878, s. 666-
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- The use of non-fullerene acceptors (NFAs) in organic solar cells has led to power conversion efficiencies as high as 18%(1). However, organic solar cells are still less efficient than inorganic solar cells, which typically have power conversion efficiencies of more than 20%(2). A key reason for this difference is that organic solar cells have low open-circuit voltages relative to their optical bandgaps(3), owing to non-radiative recombination(4). For organic solar cells to compete with inorganic solar cells in terms of efficiency, non-radiative loss pathways must be identified and suppressed. Here we show that in most organic solar cells that use NFAs, the majority of charge recombination under open-circuit conditions proceeds via the formation of non-emissive NFA triplet excitons; in the benchmark PM6:Y6 blend(5), this fraction reaches 90%, reducing the open-circuit voltage by 60 mV. We prevent recombination via this non-radiative channel by engineering substantial hybridization between the NFA triplet excitons and the spin-triplet charge-transfer excitons. Modelling suggests that the rate of back charge transfer from spin-triplet charge-transfer excitons to molecular triplet excitons may be reduced by an order of magnitude, enabling re-dissociation of the spin-triplet charge-transfer exciton. We demonstrate NFA systems in which the formation of triplet excitons is suppressed. This work thus provides a design pathway for organic solar cells with power conversion efficiencies of 20% or more. A substantial pathway for energy loss in organic solar cells may be suppressed by engineering hybridization between non-fullerene acceptor triplet excitons and spin-triplet charge transfer excitons.
Subject headings
- NATURVETENSKAP -- Biologi -- Cellbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Cell Biology (hsv//eng)
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- ref (subject category)
- art (subject category)
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Nature
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- By the author/editor
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Gillett, Alexand ...
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Privitera, Alber ...
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Dilmurat, Rishat
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Karki, Akchheta
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Qian, Deping
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Pershin, Anton
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show more...
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Londi, Giacomo
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Myers, William K ...
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Lee, Jaewon
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Yuan, Jun
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Ko, Seo-Jin
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Riede, Moritz K.
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Gao, Feng
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Bazan, Guillermo ...
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Rao, Akshay
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Nguyen, Thuc-Quy ...
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Beljonne, David
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Friend, Richard ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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and Cell Biology
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Nature
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Linköping University