Omnibearing Interpretation of External Ions Passivated Ion Migration in Mixed Halide Perovskites,Nano Letters

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Omnibearing Interpretation of External Ions Passivated Ion Migration in Mixed Halide Perovskites
Nano Letters ( IF 9.6 ) Pub Date : 2022-02-08 , DOI: 10.1021/acs.nanolett.1c03336
Hualin Wu _{1,

2} , Chenzhe Xu _{1,

2} , Zihan Zhang _{1,

2} , Zhaozhao Xiong _{1,

2} , Mingyue Shi _{1,

2} , Shuangfei Ma _{1,

2} , Wenqiang Fan _{1,

2} , Zheng Zhang _{1,

2} , Qingliang Liao _{1,

2} , Zhuo Kang _{1,

2} , Yue Zhang _{1,

2}

Affiliation

Fundamental understanding of ion migration inside perovskites is of vital importance for commercial advancements of photovoltaics. However, the mechanism for external ions incorporation and its effect on ion migration remains elusive. Herein, taking K⁺ and Cs⁺ co-incorporated mixed halide perovskites as a model, the impact of external ions on ion migration behavior has been interpreted via multiple dimensional characterization aspects. The space-effect on phase segregation inhibition has been revealed by the photoluminescence evolution and in situ dynamic cathodoluminescence behaviors. The plane-effect on current suppression along grain boundary has been evidenced via visualized surface current mapping, local current hysteresis, and time-resolved current decay. And the point-effect on activation energy incremental for individual ions has been also probed by cryogenic electronic quantification. All these results sufficiently demonstrate the passivated ion migration results in the eventually improved phase stability of perovskite, of which the origin lies in various ion migration energy barriers.

中文翻译：

全方位解读混合卤化物钙钛矿中外离子钝化离子迁移

对钙钛矿内部离子迁移的基本了解对于光伏的商业发展至关重要。然而，外部离子掺入的机制及其对离子迁移的影响仍然难以捉摸。在此，以K ⁺和Cs ⁺共掺入的混合卤化物钙钛矿为模型，通过多维表征方面解释了外部离子对离子迁移行为的影响。光致发光演化和原位揭示了对相偏析抑制的空间效应动态阴极发光行为。通过可视化的表面电流映射、局部电流滞后和时间分辨电流衰减证明了平面效应对沿晶界的电流抑制。并且还通过低温电子定量研究了单个离子对活化能增量的点效应。所有这些结果充分证明了钝化的离子迁移导致钙钛矿的相稳定性最终得到改善，其根源在于各种离子迁移能垒。

更新日期：2022-02-08

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