Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 8, Pages 3159-3165Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c00811
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Funding
- National Key Research and Development Program of China [2016YFB0302403]
- National Natural Science Foundation of China [11874081, 21675050, 21501058, 61725402]
- Scientific Research Fund of Hunan Provincial Education Department [18A005]
- Opening Fund of the Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Hunan Normal University)
- Ministry of Education [KLCBTCMR18-14]
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Boosting the stability improvement of cesium lead halide (CsPbX3) perovskite nanocrystals (NCs) remains a serious challenge. In this work, CsPbX3 NCs are effectively anchored on a hierarchical (h-) alumina (Al2O3) substrate to form seminude CsPbX3@h-Al2O3 composites, which can emit strong green light even after being stored in water for 30 days, in sharp contrast to the pure CsPbBr3 NCs. Other oxides, such as TiO2, ZnO, and SiO2, have no boosting effect on the moisture resistance of perovskite NCs. Subsequent density functional theory calculations reveal a significant charge transfer and strong Coulomb attraction between CsPbBr3 and Al2O3. The substantial charge transfer via alumina substrate modulation not only can enhance the internal stability of CsPbBr3 but also can cause CsPbBr3 to be insensitive to water adsorption. These findings are expected to deepen our understanding of improving the stability of CsPbBr3 NCs and shed light on the design of novel perovskite composites for long-term stable optoelectronic devices.
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