Issue 2, 2024

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
02 Nov 2023
Accepted
04 Dec 2023
First published
04 Dec 2023
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2024,12, 533-544

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

O. Stroyuk, O. Raievska, A. Barabash, R. W. Hooper, V. K. Michaelis, J. Hauch and C. J. Brabec, J. Mater. Chem. C, 2024, 12, 533 DOI: 10.1039/D3TC04004F

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