The stability of formamidinium lead iodide (FAPbI 3 ) perovskites is generally improved by incorporating cesium (Cs) into the crystal structure. However, the effectiveness of this approach is limited by the intrinsically low solid-solubility of Cs in bulk FAPbI 3 . To circumvent this issue, we demonstrate a method that entails solution-deposition of high-Cs-content Cs 1– x FA x PbI 3 alloy quantum dots (QDs) onto a bulk Cs-lean FAPbI 3 -based thin film. This results in a thin film with a Cs-rich QD surface layer, which stabilizes the thin film against the ambient environment. Stable, efficient perovskite solar cells based on these new thin-film structures are demonstrated.
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Que et al. (2019) studied this question.
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