Metal halide perovskite (MHP) single crystals are promising candidates for photovoltaics and related optoelectronic devices. They afford optical and charge transport properties superior to those of their polycrystalline counterparts. Despite this advantage, MHP single crystals are less widely adopted. Traditional bulk growth methods do not lend single-crystal MHPs to device integration as readily as their polycrystalline analogues, which are amenable to a multitude of approaches for deposition and growth. Fortunately, diverse shape-control approaches for MHP single crystals have been recently reported, enabling tunable optoelectronic properties and expanding the potential for single-crystal applications. In this review, we summarize recent developments in the shape control of MHP single crystals, including those pertaining to microcrystals, single-crystal thin films, nano/microplates, nano/microrods, and nanocrystals. We highlight strategies for optimizing the synthesis of these crystals to achieve targeted materials properties and device performance. This review aims to guide the future of shape design in MHP single crystals for various optoelectronic applications.

中文翻译：

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金属卤化物钙钛矿单晶的形状控制：从大块到纳米级

金属卤化物钙钛矿（MHP）单晶是光伏和相关光电子器件的有希望的候选者。它们提供的光学和电荷传输性能优于多晶同类产品。尽管有这个优点，但是MHP单晶却没有被广泛采用。传统的块状生长方法不像单晶MHP那样容易将多晶类似物用于设备集成，而多晶类似物适用于多种沉积和生长方法。幸运的是，最近已报道了用于MHP单晶的多种形状控制方法，从而实现了可调节的光电性能，并扩大了单晶应用的潜力。在这篇评论中，我们总结了MHP单晶在形状控制方面的最新进展，包括与微晶有关的最新进展，单晶薄膜，纳米/微板，纳米/微棒和纳米晶体。我们重点介绍了优化这些晶体的合成以实现目标材料性能和器件性能的策略。这篇综述旨在指导各种光电应用的MHP单晶形状设计的未来。