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High-Efficiency Photoinduced Charge Separation in Fe(III)carbene Thin Films
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.ORCID iD: 0009-0007-9402-2102
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.ORCID iD: 0000-0001-9975-6577
Center for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, SE-22100 Lund, Sweden.ORCID iD: 0000-0001-5773-1742
Center for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, SE-22100 Lund, Sweden.ORCID iD: 0000-0002-6031-3311
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2023 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 145, no 35, p. 19171-19176Article in journal (Refereed) Published
Abstract [en]

Symmetry-breaking charge separation in molecular materials has attracted increasing attention for optoelectronics based on single-material active layers. To this end, Fe(III) complexes with particularly electron-donating N-heterocyclic carbene ligands offer interesting properties with a (LMCT)-L-2 excited state capable of oxidizing or reducing the complex in its ground state. In this Communication, we show that the corresponding symmetry-breaking charge separation occurs in amorphous films of pristine [Fe(III)L-2]PF6 (L = [phenyl(tris(3-methylimidazol-2-ylidene))borate](-)). Excitation of the solid material with visible light leads to ultrafast electron transfer quenching of the (LMCT)-L-2 excited state, generating Fe(II) and Fe(IV) products with high efficiency. Sub-picosecond charge separation followed by recombination in about 1 ns could be monitored by transient absorption spectroscopy. Photoconductivity measurements of films deposited on microelectrode arrays demonstrated that photogenerated charge carriers can be collected at external contacts.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2023. Vol. 145, no 35, p. 19171-19176
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Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-517379DOI: 10.1021/jacs.3c05404ISI: 001161617600001PubMedID: 37616472OAI: oai:DiVA.org:uu-517379DiVA, id: diva2:1817771
Funder
Swedish Research Council, 2020-05058Swedish Energy Agency, P48747-1Knut and Alice Wallenberg Foundation, 2018.0074Swedish Foundation for Strategic Research, EM16-0067Available from: 2023-12-07 Created: 2023-12-07 Last updated: 2024-03-13Bibliographically approved

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Zhang, MinliJohnson, CatherineJohansson, Malin B.Lomoth, Reiner

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