Transient Ion Drift, an Effective Tool to Quantify Ion Migration in PSCs – Study cases in Composition and Crystallinity Engineering
Lucie McGovern a, Moritz Futscher a b, Isabel Koschany a, Gianluca Grimaldi a, Loreta Muscarella a, Eline Hutter a c, Bruno Ehrler a
a Center for Nanophotonics, AMOLF, The Netherlands, Science Park, 104, Amsterdam, Netherlands
b EMPA - Swiss Federal Laboratories for Materials Science and Technology, Überland Strasse, 129, Dübendorf, Switzerland
c Utrecht University, Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Netherlands
Proceedings of International Conference on Impedance Spectroscopy and Related Techniques in Metal Halide Perovskites (PERIMPED)
Online, Spain, 2020 October 6th - 7th
Organizers: Juan Bisquert, Bruno Ehrler and Eline Hutter
Oral, Lucie McGovern, presentation 007
Publication date: 25th September 2020

A major hurdle for commercialization of perovskite solar cells remains, the degradation of this class of materials under a range of environmental factors. Ion migration has been identified as one of the main drivers for degradation, decreasing the power conversion efficiency of the devices over time.

It was shown that MAPbBr3 is more stable under environmental conditions when compared to MAPbI3. Using transient ion drift, we show that this stems from key changes in ion migration when going from MAPbI3 to MAPbBr3: methylammonium migration is suppressed, while bromide migration is reduced. Composition engineering can thus be used as a tool to mitigate ion migration. We extend our investigation to the evolution of ion migration in different MAPbBr3 solar cells as a function of the grain size of the active perovskite film. We show that beyond composition engineering, crystallinity can be another effective tool to control ion migration.

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