Bringing together two nanostructures of different materials in a single building block can create a new platform where both can share their electronic and optical characteristics. While these have been extensively studied for metal nanoparticles and chalcogenide semiconductor nanocrystals, the literature is limited for perovskite nanocrystals. Because perovskite nanocrystals typically follow a fast formation process and also require a specific environment, their growth on other materials or vice versa indeed remains difficult. However, some success has been achieved in lead halide perovskites with several metal halides, oxides, and chalcogenides and also with noble metals. These findings indeed opened up new directions for designing perovskite nanocrystal heterostructures, investigating their heterojunctions, analyzing new properties, and exploring their possible utilizations. Summarizing all these developments, this Focus Review demonstrates challenges associated with their formation, changes in their optical properties, stability, and several applications. In addition, this work addresses a few possible future research directions regarding these perovskite heterostructures.

中文翻译：

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钙钛矿纳米晶体异质结构：合成，光学性质和应用。

将不同材料的两个纳米结构整合到一个构件中，可以创建一个新平台，使两者可以共享其电子和光学特性。尽管已经对金属纳米颗粒和硫族化物半导体纳米晶体进行了广泛研究，但有关钙钛矿纳米晶体的文献有限。由于钙钛矿纳米晶体通常遵循快速的形成过程并且还需要特定的环境，因此它们在其他材料上的生长或反之亦然仍然困难。但是，在与几种金属卤化物，氧化物和硫属元素化物以及贵金属的卤化钙钛矿中取得了一些成功。这些发现确实为钙钛矿纳米晶体异质结构的设计，研究异质结，分析新特性，并探索其可能的用途。总结所有这些进展，本《聚焦评论》展示了与它们的形成，其光学性质的变化，稳定性和几种应用相关的挑战。此外，这项工作解决了有关这些钙钛矿异质结构的一些可能的未来研究方向。