Water meets perovskites: investigation on the nature of hydrated iodoplumbates
Eros Radicchi a, Francesco Ambrosio b c, Edoardo Mosconi b, Filippo De Angelis a b c
a Department of Chemistry, Biology and Biotechnology, University of Perugia, Italy., Via dell' Elce di Sotto, 8, Perugia, Italy
b Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), Istituto CNR di Scienze e Tecnologie Chimiche “Giulio Natta” (CNR-SCITEC), Italy
c CompuNet, Istituto Italiano di Tecnologia (IIT), Genova, Genova, Italy
Online Conference
Proceedings of Internet Conference on Theory and Computation of Halide Perovskites (ComPer)
Online, Spain, 2020 September 8th - 9th
Organizers: Giacomo Giorgi and Linn Leppert
Poster, Eros Radicchi, 036
Publication date: 4th September 2020

Water is generally considered an enemy of organolead halide perovskite materials, being responsible for their rapid degradation and, consequently, undermining the long-term stability of perovskite-based solar cells. However, beneficial effects of liquid water have been surprisingly suggested and synthetic routes including water treatments have shown to improve the quality of perovskite films, thus suggesting that the chemistry of iodoplumbates in aqueous solution is more complex than previously thought. In this context, studying the basic interactions between perovskite precursors in aqueous environment can provide a deeper comprehension of this conundrum. Here, we investigate the chemistry of hydrated perovskite precursors employing a combined experimental and theoretical strategy, in order to unveil their peculiar structural and optical properties. Our study indicate that iodine-rich iodoplumbates are not easily formed in aqueous solution, due to the competition between iodine and solvent molecules in coordinating Pb2+, thus explaining why is diffficult to deposit perovskite from aqueous solution.

”Ministero per l’Università e la Ricerca Scientifica e Tecnologica”, MIUR (Rome, Italy)

“Dipartimenti di Eccellenza 2018-2022” (Grant AMIS), University of Perugia (Perugia, Italy)

European Union's Horizon 2020 research and innovation programme under Grant Agreement No. 764047 ESPResSo project

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