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Impact of halide substitution in the inorganic framework on the optical activity of chiral metal-halide perovskites

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The combination of chiroptical and semiconducting properties makes chiral hybrid metal-halide perovskites a promising class of materials for optoelectronic and optospintronic devices. Still, the detailed connection between the material composition and optical activity remains to be fully understood....

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Main Authors: Solhtalab, Nasrin (Author) , Liu, Shangpu (Author) , Kepenekian, Mikaël (Author) , Hoffmann, Lisa (Author) , Gessner, Julia (Author) , Fischer, Tobias (Author) , Sandner, Daniel (Author) , Shcherbakov, Andrii (Author) , Zerhoch, Jonathan (Author) , Bodnar, Stanislav (Author) , Rominger, Frank (Author) , Ballmann, Joachim (Author) , Katan, Claudine (Author) , Iglev, Hristo (Author) , Deschler, Felix (Author)
Format: Article (Journal)
Language:English
Published: May 29, 2025
In: The journal of physical chemistry. C, Energy, materials, and catalysis
Year: 2025, Volume: 129, Issue: 23, Pages: 10613-10623
ISSN:1932-7455
DOI:10.1021/acs.jpcc.5c02987
Online Access:Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1021/acs.jpcc.5c02987
Verlag, lizenzpflichtig, Volltext: https://pubs.acs.org/doi/10.1021/acs.jpcc.5c02987
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Author Notes:Nasrin Solhtalab, Shangpu Liu, Mikaël Kepenekian, Lisa Hoffmann, Julia A. Gessner, Tobias Fischer, Daniel Sandner, Andrii Shcherbakov, Jonathan Zerhoch, Stanislav Bodnar, Frank Rominger, Joachim Ballmann, Claudine Katan, Hristo Iglev, and Felix Deschler
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Summary:The combination of chiroptical and semiconducting properties makes chiral hybrid metal-halide perovskites a promising class of materials for optoelectronic and optospintronic devices. Still, the detailed connection between the material composition and optical activity remains to be fully understood. Here, we study the effect of halogen substitution on optical activity in the chiral hybrid perovskite (R,S,rac)-3BrMBA2PbI4(1-x)Br4x. We find that an unusual sign-flip occurs in the circular dichroism (CD) spectrum as the optical gap blue-shifts with increasing bromide content. We explain this observation by shifts in the energy level alignment caused by the halide substitution. We also observed an inverse relationship between the CD intensity and the microstrain induced in the lattice for mixed-halide compositions, which we attribute to inhomogeneity in chirality transfer across the inorganic framework. Last but not least, transient Faraday rotation measurements reveal that the (R/S)-3BrMBA2PbBr4 system exhibits a significant spin lifetime even at room temperature, underscoring its potential for spintronic applications.
Item Description:Gesehen am 31.03.2026
Physical Description:Online Resource
ISSN:1932-7455
DOI:10.1021/acs.jpcc.5c02987

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