Journal article
Limiting factors for charge generation in low-offset fullerene-based organic solar cells
- Abstract:
- Free charge generation after photoexcitation of donor or acceptor molecules in organic solar cells generally proceeds via (1) formation of charge transfer states and (2) their dissociation into charge separated states. Research often either focuses on the first component or the combined effect of both processes. Here, we provide evidence that charge transfer state dissociation rather than formation presents a major bottleneck for free charge generation in fullerene-based blends with low energetic offsets between singlet and charge transfer states. We investigate devices based on dilute donor content blends of (fluorinated) ZnPc:C60 and perform density functional theory calculations, device characterization, transient absorption spectroscopy and time-resolved electron paramagnetic resonance measurements. We draw a comprehensive picture of how energies and transitions between singlet, charge transfer, and charge separated states change upon ZnPc fluorination. We find that a significant reduction in photocurrent can be attributed to increasingly inefficient charge transfer state dissociation. With this, our work highlights potential reasons why low offset fullerene systems do not show the high performance of non-fullerene acceptors.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 2.0MB, Terms of use)
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(Supplementary materials, zip, 5.8MB, Terms of use)
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- Publisher copy:
- 10.1038/s41467-024-49432-5
Authors
+ Science and Technology Facilities Council
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- Funder identifier:
- https://ror.org/057g20z61
+ Engineering and Physical Sciences Research Council
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- Funder identifier:
- https://ror.org/0439y7842
- Publisher:
- Nature Research
- Journal:
- Nature Communications More from this journal
- Volume:
- 15
- Issue:
- 1
- Article number:
- 5488
- Publication date:
- 2024-06-28
- Acceptance date:
- 2024-06-05
- DOI:
- EISSN:
-
2041-1723
- Language:
-
English
- Pubs id:
-
2010992
- Local pid:
-
pubs:2010992
- Source identifiers:
-
2077491
- Deposit date:
-
2024-06-29
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Terms of use
- Copyright holder:
- Jungbluth et al.
- Copyright date:
- 2024
- Rights statement:
- © The Author(s) 2024. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/ licenses/by/4.0/.
- Licence:
- CC Attribution (CC BY)
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