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To Stop or to Shuttle Halides? The Role of an Ionic Liquid in Thermal Halide Mixing of Hybrid Perovskites

Title data

Greve, Christopher ; Ramming, Philipp ; Griesbach, Markus ; Leupold, Nico ; Moos, Ralf ; Köhler, Anna ; Herzig, Eva M. ; Panzer, Fabian ; Grüninger, Helen:
To Stop or to Shuttle Halides? The Role of an Ionic Liquid in Thermal Halide Mixing of Hybrid Perovskites.
In: ACS Energy Letters. Vol. 8 (2023) . - pp. 5041-5049.
ISSN 2380-8195
DOI: https://doi.org/10.1021/acsenergylett.3c01878

Official URL: Volltext

Project information

Project title:
Project's official title
Project's id
SPP 2196
506642499
SFB 1585 "MultiTrans"
492723217
PA 3373/7-1
PA 3373/7-1
MO 1060/32-1
MO 1060/32-1
solar technologies go hybrid
No information

Project financing: Bayerisches Staatsministerium für Wissenschaft, Forschung und Kunst
Deutsche Forschungsgemeinschaft
Europäische Strukturfonds

Abstract in another language

Ionic liquids, such as BMIMBF4, are added to mixed halide perovskites to prevent halide phase segregation and increase phase stability, but exact mechanisms changing halide kinetics are currently unclear. Here, X-ray diffraction, nuclear magnetic resonance, and photoluminescence spectroscopy are used in situ under dark conditions to follow thermally driven halide mixing processes forming MAPbI3–xBrx from physical mixtures of MAPbI3 and MAPbBr3 powders with and without BMIMBF4. Halide migration is significantly accelerated with BMIMBF4 compared to additive-free mixtures. This is attributed to liquid-like dynamics of BMIMBF4 at elevated temperatures, liberating defect sites at perovskite interfaces. Furthermore, the presence of BMIMBF4 increases the activation energies for bromide migration, suggesting a changed nature of the latter. This is explained by a preferred interaction between BMIM+ and bromide, indicating that the cations of the additive shuttle bromide ions between interfaces. Overall, these observations pave the way for a better understanding of halide transport in hybrid perovskites.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Juniorprofessor Experimental Physics VII - Dynamics and Structure Formation
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Juniorprofessor Experimental Physics VII - Dynamics and Structure Formation > Juniorprofessor Experimental Physics VII - Dynamics and Structure Formation - Juniorprof. Dr. Eva M. Herzig
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry III
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Research Institutions
Research Institutions > Central research institutes
Research Institutions > Central research institutes > Nordbayerisches Zentrum für NMR-Spektroskopie - NMR-Zentrum
Research Institutions > Collaborative Research Centers, Research Unit > SFB 1585 - MultiTrans – Structured functional materials for multiple transport in nanoscale confinements
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 09 Nov 2023 06:27
Last Modified: 09 Feb 2024 07:58
URI: https://eref.uni-bayreuth.de/id/eprint/87493