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- Title
Magnetic‐Field‐Induced Modulation of Charge‐Recombination Dynamics in a Rosarin‐Fullerene Complex.
- Authors
Kim, Taeyeon; Kim, Juno; Ke, Xian‐Sheng; Brewster, James T.; Oh, Juwon; Sessler, Jonathan L.; Kim, Dongho
- Abstract
Charge‐recombination processes are critical for photovoltaic applications and should be suppressed for efficient charge transport. Here, we report that an applied magnetic field (0–1 T) can be used control the charge‐recombination dynamics in an expanded rosarin‐C60 complex. In the low magnetic field regime (<100 mT), the charge‐recombination rate slows down due to hyperfine coupling, as inferred from transient absorption spectroscopic analyses. In contrast, in the high field regime, i.e., over 500 mT, the charge‐recombination rate recovers and increases because the Δg mechanism facilitates spin conversion to a triplet charge‐separated state (S to T0) that undergoes rapid charge‐recombination to a localized rosarin triplet state. Therefore, we highlight the charge‐recombination rate and the localized triplet state population can be modulated by the magnetic field in charge donor/acceptor non‐covalent complexes.
- Subjects
HYPERFINE coupling; MAGNETIC fields; MAGNETIC field effects
- Publication
Angewandte Chemie, 2021, Vol 133, Issue 17, p9465
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202017332