Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
Impressive advances in the research field of perovskite solar cells have allowed reaching power conversion efficiencies above 22%,[1] which turn them into real competitors against crystalline silicon technologies. However, solution processed perovskite materials are still based on toxic and/or hazardous solvents that, despite giving rise to an optimum control on crystallization for a wide range of compositions and deposition techniques, limit both their processing and scalability for future commercialization.[2,3] Although several approaches have tried to face this issue by considering different solute-solvent interaction models,[4] most of them have failed in finding a completely green alternative, compatible at industrial level.
In here, we review the most relevant approaches applied to the solvent engineering of perovskite precursors: Hansen solubility,[5] Mayer bond order[6] and Guttman donor number.[7] Based on them, we experimentally evaluated the solubility of both lead halide and perovskite solutions in potential green alternatives obtained after a conscious screening process. An additional method accounting for similarities between functional groups was also considered. Although none of the pure solvents achieved to dissolve PbI2 at 400 mg/ml, 3 alternative candidates and a set of additives have been determined, all of them non-toxic (i.e. GSH06), non-hazardous for people (i.e. GSH08) and non-dangerous for the environment (i.e. GSH09), with very promising properties for perovskite formation.
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 763989.
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