The severe recombination of carriers and poor stability against moisture environment have limited the application of CsPbX₃ (X = Cl, Br, I) nanocrystals in photodetection. Herein, a large-scale synthesis of SnO₂-coated CsPbBr₃ NCs (abbreviated to CsPbBr₃@SnO₂ NCs) has been reported for the first time by combining the water-triggered transformation of Cs₄PbBr₆ NCs and the hydrolysis of tin 2-ethylhexanoate. Owing to the construction of the CsPbBr₃/SnO₂ heterojunction, the recombination rate of carriers in the CsPbBr₃@SnO₂ NCs is greatly reduced compared to that of the pristine CsPbBr₃ NCs. The stability against water degradation is also improved due to the protection of the SnO₂ coating. Accordingly, a CsPbBr₃@SnO₂-graphene hybrid device for high-performance photodetection is demonstrated. Results show that the responsivity of the device reaches 6.2 $\times$10⁴ A W⁻¹ at 1 V, which is over 496-fold of the pristine CsPbBr₃ device. This work not only provides a robust approach for the surface modification of CsPbX₃ NCs but also offers useful guidance on the optoelectronic applications with CsPbX₃ NCs.

中文翻译：

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用于高性能光电检测的光电子提取和环境稳定的 CsPbBr3@SnO2 纳米晶体

CsPbX ₃ (X = Cl, Br, I)纳米晶载流子复合严重，对潮湿环境的稳定性差，限制了其在光电探测中的应用。_{在此，通过结合 Cs 4} PbBr ₆ NC 的水引发转化和锡的水解，首次报道了SnO ₂包覆的 CsPbBr ₃ NCs（缩写为 CsPbBr ₃ @SnO ₂ NCs）的大规模合成2-乙基己酸酯。由于CsPbBr ₃ /SnO _{2异质结的构建，载流子在CsPbBr 3} @SnO ₂中的复合率_{与原始 CsPbBr 3} NC相比，NC 大大减少。由于 SnO ₂涂层的保护，还提高了抗水降解的稳定性。因此，展示了用于高性能光电检测的CsPbBr ₃ @SnO _{2 -石墨烯混合器件。}结果表明，该器件的响应度达到6.2$\times$10 ⁴ AW ^-1在 1 V，这是原始 CsPbBr ₃器件的 496 倍以上。这项工作不仅为 CsPbX 3 NC 的表面改性提供了一种可靠的方法，而且还为 CsPbX _{3 NC}的光电应用提供了有用的指导。