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Magnetic‐Field‐Induced Modulation of Charge‐Recombination Dynamics in a Rosarin‐Fullerene Complex
Author(s) -
Kim Taeyeon,
Kim Juno,
Ke XianSheng,
Brewster James T.,
Oh Juwon,
Sessler Jonathan L.,
Kim Dongho
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202017332
Subject(s) - charge (physics) , recombination , hyperfine structure , atomic physics , population , magnetic field , chemistry , spin (aerodynamics) , chemical physics , molecular physics , physics , biochemistry , demography , quantum mechanics , sociology , gene , thermodynamics
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‐C 60 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 T 0 ) 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.