Understanding instability in formamidinium lead halide perovskites: kinetics of transformative reactions at grain and sub-grain boundaries - Archive ouverte HAL
Article Dans Une Revue ACS Energy Letters Année : 2022

Understanding instability in formamidinium lead halide perovskites: kinetics of transformative reactions at grain and sub-grain boundaries

Résumé

Transformative and reconstructive reactions impart significant structural changes at particle boundaries of hybrid perovskites, which influence environmental stability and optoelectronic properties of these materials. Here, we investigate the moisture-induced transformative reactions in formamidinium based perovskites FAPbX3 (X=I, Br) and show that the ambient stability of these materials can be adjusted from a few hours to several months. For FAPbI3, roles of water vapor, particle size, and light illumination on the kinetic pathways of the cubic () transformation to the hexagonal () phase are analyzed by X-ray diffraction, optical microscopy, photoluminescence and solid-state NMR spectroscopy techniques. The grain and sub-grain boundaries exhibit different →-FAPbI3 phase transformation kinetics. Our study suggests that the dynamic transformation involves the local water-induced dissolution of the cubic phase

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hal-04087972 , version 1 (03-05-2023)

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Parth Raval, Rhiannon Kennard, Eugenia Vasileiadou, Clayton Dahlman, Ioannis Spanopoulos, et al.. Understanding instability in formamidinium lead halide perovskites: kinetics of transformative reactions at grain and sub-grain boundaries. ACS Energy Letters, 2022, 7 (4), pp.1534-1543. ⟨10.1021/acsenergylett.2c00140⟩. ⟨hal-04087972⟩
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