Anion exchange offers great flexibility and high precision in phase control, compositional engineering, and optoelectronic property tuning. Different from previous successful anion exchange process in liquid solution, herein, a vapor‐phase anion‐exchange strategy is developed to realize the precise phase and bandgap control of large‐scale inorganic perovskites by using gas injection cycle, producing some perovskites such as CsPbCl₃ which has never been reported in thin film morphology. Ab initio calculations also provide the insightful mechanism to understand the impact of anion exchange on tuning the electronic properties and optimizing the structural stability. Furthermore, because of precise control of specific atomic concentrations, intriguing tunable photoluminescence is observed and photodetectors with tunable photoresponse edge from green to ultraviolet light can be realized accurately with an ultrahigh spectral resolution of 1 nm. Therefore, a new, universal vapor‐phase anion exchange method is offered for inorganic perovskite with fine‐tunable optoelectronic properties.

中文翻译：

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汽相阴离子交换策略精确控制大型无机钙钛矿

阴离子交换在相控制，成分工程和光电性能调节方面提供了极大的灵活性和高精度。与先前成功地在液体溶液中进行阴离子交换的方法不同，本文开发了一种气相阴离子交换策略，以通过气体注入循环实现大型无机钙钛矿的精确相和带隙控制，产生一些钙钛矿，例如CsPbCl _3。薄膜形态从未报道过。从头算计算也提供了深刻的机制，可了解阴离子交换对调节电子性能和优化结构稳定性的影响。此外，由于可以精确控制特定原子浓度，因此可以观察到令人感兴趣的可调光致发光，并且可以以1 nm的超高光谱分辨率准确实现从绿色到紫外光具有可调光响应边缘的光电探测器。因此，提供了一种新的通用气相阴离子交换方法，用于具有良好可调光电子性能的无机钙钛矿。