Impact of Halide Substitution in the Inorganic Framework on the Optical Activity of Chiral Metal-Halide Perovskites
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.
Authors
- Nasrin Solhtalab
- Claudine Katan (ORCID: https://orcid.org/0000-0002-2017-5823)
- Daniel Sandner (ORCID: https://orcid.org/0000-0002-0554-5777)
- Joachim Ballmann (ORCID: https://orcid.org/0000-0001-6431-4197)
- Mikaël Képénékian (ORCID: https://orcid.org/0000-0001-5192-5896)
- Felix Deschler (ORCID: https://orcid.org/0000-0002-0771-3324)
- Jonathan Zerhoch (ORCID: https://orcid.org/0000-0003-4336-8828)
- Julia Anthea Gessner (ORCID: https://orcid.org/0009-0003-4838-7689)
- Andrii Shcherbakov
- Shangpu Liu (ORCID: https://orcid.org/0000-0001-9067-7098)
- Stanislav Bodnar (ORCID: https://orcid.org/0000-0002-1159-2983)
- Lisa Hoffmann (ORCID: https://orcid.org/0000-0003-4310-3133)
- Tobias Fischer (ORCID: https://orcid.org/0000-0002-8141-4795)
- Frank Röminger
- Hristo Iglev (ORCID: https://orcid.org/0000-0001-9208-0068)
Institutions
- Centre National de la Recherche Scientifique (FR)
- Heidelberg University (DE)
- Institut National des Sciences Appliquées de Rennes (FR)
- Institut des Sciences Chimiques de Rennes (FR)
- École Nationale Supérieure de Chimie de Rennes (FR)
- Technical University of Munich (DE)
Publication Details
- Journal
- The Journal of Physical Chemistry C
- Published
- 2025-05-29
- DOI
- https://doi.org/10.1021/acs.jpcc.5c02987
- Citations
- 1
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.73
Funders
- Deutsche Forschungsgemeinschaft
- H2020 European Research Council