Magnetic‐Field‐Induced Modulation of Charge‐Recombination Dynamics in a Rosarin‐Fullerene Complex

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.

“One-pot” synthesis of oligopyrrolic dialdehydes

“…Heterocycle bridged dialdehydes constitute a family of building blocks that have found diverse applications in materials chemistry and beyond. 1–6 Within this class of compounds, α,α′-linked oligopyrrolic dialdehydes have emerged as useful building blocks for the construction of expanded porphyrins and related macrocycles, as well as molecular cage systems. 7–12 To date, extensive efforts have been dedicated to developing improved and convenient routes to various heterocycle bridged α,α′-linked oligopyrrolic dialdehydes.…”

Spin Effect to Promote Reaction Kinetics and Overall Performance of Lithium‐Sulfur Batteries under External Magnetic Field

“…The use of static fields to promote (electro)catalytic performance at a negligible energy cost is a topic of major interest [1–4] . In particular, moderate magnetic fields externally applied by permanent magnets or built‐in using ferromagnetic additives can modify the properties of the reaction precursor/intermediate/ product and of the catalyst itself to enhance catalytic activity, selectivity and even stability [5–7] .…”

“…The use of static fields to promote (electro)catalytic performance at a negligible energy cost is a topic of major interest. [1][2][3][4] In particular, moderate magnetic fields externally applied by permanent magnets or built-in using ferromagnetic additives can modify the properties of the reaction precursor/intermediate/ product and of the catalyst itself to enhance catalytic activity, selectivity and even stability. [5][6][7] A magnetic field can drive ions/molecules, orientate them and their orbitals, modify the orbital symmetry, and reduce/increase orbital overlapping, thus the molecular bond strength to facilitate cleavage/bonding.…”

Magnetic‐Field‐Induced Modulation of Charge‐Recombination Dynamics in a Rosarin‐Fullerene Complex

“…Figure1. (a) Molecular structure of pristine rosarin (R) (left) and side view of rosarin/C 60 complex (RC; right) [33]. (b) Absorption spectra of R and RC in toluene (titration of C 60 ).…”