Tracking Dynamic Phase Segregation in Mixed‐Halide Perovskite Single Crystals under Two‐Photon Scanning Laser Illumination,Small Methods

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Tracking Dynamic Phase Segregation in Mixed‐Halide Perovskite Single Crystals under Two‐Photon Scanning Laser Illumination
Small Methods ( IF 10.7 ) Pub Date : 2019-05-23 , DOI: 10.1002/smtd.201900273
Weijian Chen ₁ , Wenxin Mao _{2,

3} , Udo Bach _{2,

3} , Baohua Jia ₁ , Xiaoming Wen ₁

Affiliation

Photoinduced phase segregation in mixed halide perovskites has received considerable attention due to its critical roles in diminishing device performance in photovoltaic and light‐emitting applications. Here, dynamic photoinduced phase segregation and dark recovery in mixed halide perovskite single crystal microplatelets are investigated, combining depth‐resolved, temporal‐resolved, and detection‐wavelength selective spectroscopic imaging techniques. Under identical illumination, the edges and interior of microplatelets exhibit significantly different phase segregation. An intimate correlation of PL dynamics between I‐phase and Br‐phase indicates that the halide substitution is the dominant effect. In the dark, the phase‐segregated crystals reversibly recover to the stable equivalence. This work clarifies the critical role of the edge state of the microplatelets and reveals the physical mechanism of phase segregation in mixed halide perovskites, which is of crucial importance for their applications in photovoltaics and photonics.

中文翻译：

在双光子扫描激光照明下跟踪混合卤化物钙钛矿单晶中的动态相分离

混合卤化物钙钛矿中的光致相分离引起了人们的广泛关注，这是因为它在降低光伏和发光应用中的器件性能中起着至关重要的作用。在这里，结合了深度分辨，时间分辨和检测波长选择性光谱成像技术，研究了混合卤化物钙钛矿单晶微板中的动态光致相分离和暗恢复。在相同的照明下，微片的边缘和内部表现出明显不同的相分离。I相和Br相之间PL动力学的密切相关表明，卤化物取代是主要作用。在黑暗中，相分离的晶体可逆地恢复到稳定的当量。

更新日期：2019-05-23

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