Quantification of Ion Migration in MAPbBr3 Solar Cells with varying Grain Size
Lucie McGovern a, Loreta Muscarella a, Moritz Futscher a, Bruno Ehrler a
a Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Lucie McGovern, 021
Publication date: 11th February 2019

Hybrid halide perovskites have been attracting extensive interest as next-generation photovoltaic technologies. Specifically, large bandgap metal halide perovskites such as MAPbBr3 offer a range of applications in multijunction solar cells, electrochemical energy storage, electrocatalysis, and LEDs, as well as providing an interesting platform for comparison with the more commonly studied MAPbI3, and mixed-halide perovskites.

It was shown that substituting Br for I increases the chemical stability making MAPbBr3 much more stable under environmental conditions when compared to MAPbI3. We study this increase in stability under environmental conditions  and show that it stems from a change in ion migration properties when going from MAPbI3 to MAPbBr3. Furthermore, we investigate the evolution of this behavior in different MAPbBr3 solar cells as a function of the grain size of the active perovskite film. Grain boundaries change ion migration by providing alternative pathways for the ions to migrate, thereby affecting crucial properties of the process such as activation energy and diffusion coefficient. In our work, we use Transient Ion Drift to quantify the activation energies, diffusion coefficients, and concentrations of the mobile ions, and show the ling between grain size, ion migration, and stability.

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