Halide perovskites are promising candidate materials for the next generation high‐efficiency optoelectronic devices. Since perovskites are electronic‐ionic mixed conductors, ion dynamics have a critical impact on the performance and stability of perovskite‐based applications. However, comprehensively understanding ionic dynamics is challenging, particularly on nanoscale imaging of ionic dynamics in perovskites. In this review, mobile ion dynamics in halide perovskites investigated via luminescence spectroscopy combined with confocal microscopy are discussed, including mobile ion induced fluorescence quenching, phase segregation in mixed halide hybrid perovskite, and mobile ion accumulation at the interface in perovskite devices. Steady‐state and time‐resolved luminescence imaging techniques, combined with confocal microscopy, are unique tools for probing ionic dynamics in perovskites, providing invaluable insights on ionic dynamics in nanoscale resolution, along with a wide temporal range from picoseconds to hours. The works in this review are not only for understanding mobile ions to improve the design of perovskite‐based devices but also foster the development of microspectroscopic methodologies in a broader solid‐state physics context of investigating ionic transports in polycrystalline materials.

中文翻译：

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使用时间分辨显微技术揭示卤化物钙钛矿太阳能电池中移动离子的动态效应

卤化物钙钛矿是下一代高效光电器件的有前途的候选材料。由于钙钛矿是电子-离子混合导体，离子动力学对基于钙钛矿的应用的性能和稳定性具有关键影响。然而，全面了解离子动力学具有挑战性，特别是在钙钛矿中离子动力学的纳米级成像方面。在这篇综述中，讨论了通过发光光谱结合共聚焦显微镜研究的卤化物钙钛矿中的移动离子动力学，包括移动离子诱导的荧光猝灭、混合卤化物杂化钙钛矿中的相分离以及钙钛矿器件界面处的移动离子积累。稳态和时间分辨发光成像技术，结合共聚焦显微镜，是探测钙钛矿中离子动力学的独特工具，以纳米级分辨率提供有关离子动力学的宝贵见解，以及从皮秒到数小时的广泛时间范围。本综述中的工作不仅是为了理解移动离子以改进基于钙钛矿的设备的设计，而且还在更广泛的固态物理背景下促进显微光谱方法的发展，以研究多晶材料中的离子传输。