Journal article
Direct visualization of the charge transfer state dynamics in dilute-donor organic photovoltaic blends
- Abstract:
- The interconversion dynamics between charge transfer state charges (CTCs) and separated charges (SCs) is still an unresolved issue in the field of organic photovoltaics. Here, a transient absorption spectroscopy (TAS) study of a thermally evaporated small-molecule:fullerene system (α6T:C60) in different morphologies (dilute intermixed and phase separated) is presented. Spectral decomposition reveals two charge species with distinct absorption characteristics and different dynamics. Using time-dependent density functional theory, these species are identified as CTCs and SCs, where the spectral differences arise from broken symmetry in the charge transfer state that turns forbidden transitions into allowed ones. Based on this assignment, a kinetic model is formulated allowing the characterization of the charge generation, separation, and recombination mechanisms. We find that SCs are either formed directly from excitons within a few picoseconds or more slowly (~30–80 ps) from reversible splitting of CTCs. These findings constitute the first unambiguous observation of spectrally resolved CTCs and SCs.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 2.7MB, Terms of use)
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(Preview, Supplementary materials, pdf, 1.8MB, Terms of use)
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- Publisher copy:
- 10.1038/s41467-024-53694-4
Authors
+ Swiss National Science Foundation
More from this funder
- Funder identifier:
- https://ror.org/00yjd3n13
- Publisher:
- Springer Nature
- Journal:
- Nature Communications More from this journal
- Volume:
- 15
- Issue:
- 1
- Article number:
- 9851
- Publication date:
- 2024-11-14
- Acceptance date:
- 2024-10-18
- DOI:
- EISSN:
-
2041-1723
- Language:
-
English
- Pubs id:
-
2062700
- Local pid:
-
pubs:2062700
- Source identifiers:
-
2419375
- Deposit date:
-
2024-11-14
Terms of use
- Copyright holder:
- Moore et al
- Copyright date:
- 2024
- Rights statement:
- © 2024 The Authors. 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.
- Licence:
- CC Attribution (CC BY)
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