Lead halide perovskites have led to huge advances in solar cells, emitters, and sensors due to the high efficiency of charge generation in such materials. However, perovskites face significant challenges in applications involving contact with water or high humidity. Two‐dimensional layered materials offer the potential for confining synthesis of halide perovskites to the inter‐layer space. In this study, the synthesis of lead halide perovskite CsPbBr 3 in the interstitial space between nanoscopic layered silicate clays was carried out, leading to composites with significantly improved resistance of CsPbBr 3 to degradation by water, allowing retention of fluorescence at 520 nm for days dispersed in water as opposed to ≈1 min for control CsPbBr 3 . Furthermore, the degradation of entrapped CsPbBr 3 nanocrystals in water led to a slow increase of a broad emission band centered at 425 nm, attributed to small clusters of CsPbBr 3 . This study further advances approaches to improve the stability of halide perovskites in aqueous media, which will lead to significant advances in applications in which exposure to water or moisture is a concern.
Clasen et al. (Sun,) studied this question.
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