Stabilization of halide perovskites in water solutions
Manuel Vasquez-Montoya a, Eva Unger a
a Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße, 15, Berlin, Germany
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Manuel Vasquez-Montoya, presentation 172
Publication date: 20th April 2022

The chemical instability of hybrid halide perovskites in protic solvents remains the main obstacle for their application including solar fuels generation. In our work, we successfully stabilize Ruddlesson-Poppler perovskite PEA2PbIin aqueous solutions. Dissolved phenylethylammonium iodide salt forms a dynamic equilibrium preventing the perovskite degradation in water. In-situ UVvis spectroscopy and in-situ photoluminescence spectroscopy enable to monitor the respective process behind the perovskite stability. Additionally, inductive coupled mass spectroscopy (ICP-MS) reveals the compositional changes of the electrolyte after perovskite immersion. Furthermore, the hydrogen evolution reaction was studied in a three-electrode setup with the iodine evolution as counter reaction. This result denotes the possibility to use perovskite absorbers for solar fuels generation in aqueous media, providing valuable information on the general understanding of the degradation of perovskites and opening an exciting window to novel applications of perovskite absorbers.

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