Issue 20, 2019

The phase diagram of a mixed halide (Br, I) hybrid perovskite obtained by synchrotron X-ray diffraction

Abstract

By using synchrotron X-ray powder diffraction, the temperature dependent phase diagram of the hybrid perovskite tri-halide compounds, methyl ammonium lead iodide (MAPbI3, MA+ = CH3NH3+) and methyl ammonium lead bromide (MAPbBr3), as well as of their solid solutions, has been established. The existence of a large miscibility gap between 0.29 ≤ x ≤ 0.92 (±0.02) for the MAPb(I1−xBrx)3 solid solution has been proven. A systematic study of the lattice parameters for the solid solution series at room temperature revealed distinct deviations from Vegard's law. Furthermore, temperature dependent measurements showed that a strong temperature dependency of lattice parameters from the composition is present for iodine rich compositions. In contrast, the bromine rich compositions show an unusually low dependency of the phase transition temperature from the degree of substitution.

Graphical abstract: The phase diagram of a mixed halide (Br, I) hybrid perovskite obtained by synchrotron X-ray diffraction

  • This article is part of the themed collection: Solar energy

Supplementary files

Article information

Article type
Paper
Submitted
14 nov 2018
Accepted
02 apr 2019
First published
09 apr 2019
This article is Open Access
Creative Commons BY license

RSC Adv., 2019,9, 11151-11159

The phase diagram of a mixed halide (Br, I) hybrid perovskite obtained by synchrotron X-ray diffraction

F. Lehmann, A. Franz, Daniel M. Többens, S. Levcenco, T. Unold, A. Taubert and S. Schorr, RSC Adv., 2019, 9, 11151 DOI: 10.1039/C8RA09398A

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