eprintid: 36592
rev_number: 27
eprint_status: archive
userid: 9028
dir: disk0/00/03/65/92
datestamp: 2025-06-04 09:18:07
lastmod: 2025-06-04 09:18:31
status_changed: 2025-06-04 09:18:07
type: preprint
metadata_visibility: show
creators_name: Solhtalab, Nasrin
creators_name: Liu, Shangpu
creators_name: Kepenekian, Mikaël
creators_name: Hoffmann, Lisa
creators_name: Gessner, Julia A.
creators_name: Fischer, Tobias
creators_name: Sandner, Daniel
creators_name: Shcherbakov, Andrii
creators_name: Zerhoch, Jonathan
creators_name: Bodnar, Stanislav
creators_name: Rominger, Frank
creators_name: Ballmann, Joachim
creators_name: Katan, Claudine
creators_name: Iglev, Hristo
creators_name: Deschler, Felix
title: Impact of Halide Substitution in the Inorganic Framework on the Optical Activity of Chiral Metal-Halide Perovskites
subjects: ddc-530
subjects: ddc-540
divisions: i-120100
divisions: i-120200
divisions: i-120300
abstract: The combination of chiroptical and semiconducting properties makes chiral hybrid metal-halide perovskites a promising class of materials for optoelectronic and opto-spintronic devices. Still, the detailed connection between 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 blueshifts 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 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.
date: 2025
id_scheme: DOI
id_number: 10.11588/heidok.00036592
fp7_project_id: 852084
own_urn: urn:nbn:de:bsz:16-heidok-365924
language: eng
bibsort: SOLHTALABNIMPACTOFHA
full_text_status: public
place_of_pub: Heidelberg
related_url_url: https://pubs.acs.org/doi/10.1021/acs.jpcc.5c02987
citation:   Solhtalab, Nasrin ; Liu, Shangpu ; Kepenekian, Mikaël ; Hoffmann, Lisa ; Gessner, Julia A. ; Fischer, Tobias ; Sandner, Daniel ; Shcherbakov, Andrii ; Zerhoch, Jonathan ; Bodnar, Stanislav ; Rominger, Frank ; Ballmann, Joachim ; Katan, Claudine ; Iglev, Hristo ; Deschler, Felix  (2025) Impact of Halide Substitution in the Inorganic Framework on the Optical Activity of Chiral Metal-Halide Perovskites.  [Preprint]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/36592/13/Solhtalab_Impact_Halide_2025.pdf
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/36592/14/Solhtalab_Impact_Halide_Suppl_2025.pdf