Band-bowing effects in lead-free double Cs2AgBixSb1−xCl6 perovskites and their anion-exchanged derivatives

Stroyuk O, Raievska O, Barabash A, Hooper RW, Michaelis VK, Hauch J, Brabec C (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Journal of Materials Chemistry C Royal Society of Chemistry

Book Volume: 12

Pages Range: 533-544

Journal Issue: 2

DOI: 10.1039/d3tc04004f

Abstract

Green synthesis of lead-free Cs2AgBixSb1−xCl6 solid-solution double perovskites and their conversion into bromide and iodide derivatives is reported. Interaction of the single-phase Cs2AgBixSb1−xCl6 double perovskites with sodium iodide in 2-propanol/glycerol yields Cs3Bi2xSb2(1−x)I9 derivatives with varied Bi/Sb ratio, while the similar anion exchange with sodium bromide results in mixtures of Cs3Bi2xSb2(1−x)Cl3Br6 and Cs2AgBixSb1−xCl2Br4. A band-bowing effect is revealed for the starting chloride perovskites and the anion-exchange products, with the indirect band gap of intermediate Bi/Sb mixed compounds being significantly lower than the band gaps of corresponding Bi- and Sb-pure products. Solid-state nuclear magnetic resonance spectroscopy uncovered that the band-bowing originates from the lattice disorder of mixed Bi/Sb halide compounds, thus highlighting a new approach for the bandgap design of halide perovskites.

Authors with CRIS profile

Anastasia Barabash Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET) Jens Hauch Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET)

Involved external institutions

Helmholtz-Institut Erlangen-Nürnberg für Erneuerbare Energien (HI-ERN) DE Germany (DE) University of Alberta CA Canada (CA)

How to cite

APA:

Stroyuk, O., Raievska, O., Barabash, A., Hooper, R.W., Michaelis, V.K., Hauch, J., & Brabec, C. (2023). Band-bowing effects in lead-free double Cs2AgBixSb1−xCl6 perovskites and their anion-exchanged derivatives. Journal of Materials Chemistry C, 12(2), 533-544. https://doi.org/10.1039/d3tc04004f

MLA:

Stroyuk, Oleksandr, et al. "Band-bowing effects in lead-free double Cs2AgBixSb1−xCl6 perovskites and their anion-exchanged derivatives." Journal of Materials Chemistry C 12.2 (2023): 533-544.

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