Understanding the Kinetics of Phase Segregation - Ion Migration in Mixed-Halide Perovskites
Lucie McGovern a, Moritz Futscher a b, Eline Hutter a c, Loreta Muscarella a, Bruno Ehrler a
a Center for Nanophotonics, AMOLF, The Netherlands, Science Park, 104, Amsterdam, Netherlands
b École Polytechnique Fédérale de Lausanne EPFL, EMPA, èberlandstrasse 129, Dübendorf, Switzerland
c Utrecht University, The Netherlands, Princetonplein, 1, Utrecht, Netherlands
Poster, Lucie McGovern, 014
Publication date: 1st April 2020
ePoster: 

The bandgap of mixed halide perovskites is unstable under illumination. To understand this process, we compare ion migration in mixed-halide perovskites, using Transient Ion Drift. Specifically, we measure MAPbI(3x)Br(3-3x) with x = 0, x = 0.5, x = 0.7 and x = 1  [1]. We find an additional halide species is migrating in the mixed-phase perovskites compared to the pure-phase of MAPbI3 and MAPbBr3. We also find a decrease in both the diffusion coefficient and activation energy for ions to migrate in the mixed compositions compared to pristine. These results shed light on the underlying ion migration phenomena in mixed halide perovskites.

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