All-inorganic lead halide perovskites have attracted tremendous interest for their excellent stability when compared with hybrid perovskites. Here we report a large-area growth of monocrystalline all-inorganic perovskite thin films and further patterning them into heterostructure arrays. We show that highly oriented CsPbBr₃ microcrystal domains can be readily grown on muscovite mica substrates with a well-defined epitaxial relationship, which can further expand and eventually merge into large-area monocrystalline CsPbBr₃ thin films with an excellent optical quality. Taking a step further, we show the large-area CsPbBr₃ thin film can be further patterned and selectively transformed into CsPbI₃ using a selective anion-exchange process to produce CsPbBr₃–CsPbI₃ lateral heterostructure arrays with spatially modulated photoluminescence emission and an apparent current rectification behavior. The capability to grow large-area CsPbBr₃ monocrystalline thin films and heterostructure arrays defines a robust material platform for both the fundamental investigations and potential applications in optoelectronics.

中文翻译：

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全无机卤化铅钙钛矿薄膜和异质结构的大面积合成与构图

与混合钙钛矿相比，全无机卤化铅钙钛矿因其出色的稳定性而引起了极大的兴趣。在这里，我们报告了单晶全无机钙钛矿薄膜的大面积增长，并将其进一步图案化为异质结构阵列。我们表明高度定向的CsPbBr ₃微晶域可以很容易地在具有明确定义的外延关系的白云母云母衬底上生长，这可以进一步扩展并最终合并为具有出色光学质量的大面积单晶CsPbBr ₃薄膜。进一步采取的措施，我们表明可以进一步构图大面积CsPbBr ₃薄膜并将其选择性转化为CsPbI ₃使用选择性阴离子交换过程产生具有空间调制的光致发光发射和明显的电流整流行为的CsPbBr ₃ –CsPbI ₃横向异质结构阵列。生长大面积CsPbBr ₃单晶薄膜和异质结构阵列的能力为光电学的基础研究和潜在应用定义了强大的材料平台。