Unfolding the role of local cation heterogeneities on the phase segregation and recovery in mixed-halide perovskites

DOI

Mixed-halide perovskites suffer from light-induced segregation, forming halide-rich domains with different bandgaps. Local techniques show local heterogeneities in the distribution of halides, which may lead to local strain that initiates halide segregation. It was found that the halide segregation kinetics also depend on the type of cation. Mixing cations reduces halide segregation but it remains unclear whether this is related to a relaxation of the strain. In this proposal, we will use time-resolved WAXS experiments to get insights on strain effects on phase segregation and recovery as function of cation composition. We will investigate the effect of pressure on the strain in mixed-cation perovskites, which was not reported before. Finally, although bulk techniques suggest full recovery of halide segregation, it is likely that some heterogeneities remain on local scale. Therefore, if the SAXS/WAXS is available, we will determine the local reversibility of halide segregation.

Identifier
DOI https://doi.org/10.15151/ESRF-ES-1022932247
Metadata Access https://icatplus.esrf.fr/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatplus.esrf.fr:inv/1022932247
Provenance
Creator Bettina BAUMGARTNER ORCID logo; Loreta MUSCARELLA ORCID logo; Huygen JOBSIS ORCID logo; Charles MCMONAGLE ORCID logo; Eline HUTTER ORCID logo
Publisher ESRF (European Synchrotron Radiation Facility)
Publication Year 2026
Rights CC-BY-4.0; https://creativecommons.org/licenses/by/4.0
OpenAccess true
Representation
Resource Type Data from large facility measurement; Collection
Discipline Particles, Nuclei and Fields