Illumination Regulated Ion Migration in Metal Halide Perovskite

IF 4.6 2区化学 Q2 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry Letters Pub Date : 2025-09-18 DOI:10.1021/acs.jpclett.5c02483

Jinbao Han, , , Shengjian Qin, , , Huan Liu, , , Menghan Chen, , , Zixuan Shang, , , Boru Tian, , , Zishang Liang, , , Mengxi Lv, , , Yanli Zeng, , and , Jinjin Zhao*,

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Abstract

Ion migration in CsPbBr₃ perovskites, crucial for device stability and performance, is investigated under combined illumination and direct current (DC) or alternating current (AC) bias using macroelectrical and nanoscale microscopy. DC measurements demonstrate that illumination suppresses bias-induced ion migration, reducing the current drop amplitude (ΔI/I) from 60.68% (dark) to 18.19% (3.80 mW/cm²), attributed to photogenerated carrier passivating vacancies. Photocurrent atomic force microscopy reveals grain boundaries as preferential migration pathways under light, exhibiting 9.6-fold higher mechanical work dissipation than grains. Under AC bias, illumination enhances polarization, evidenced by an +8° out-of-plane phase shift in piezoresponse force microscopy, and increases surface potential (Kelvin probe force microscopy: 2.35 V dark to 3.27 V), confirming light-promoted ion migration via polarization modulation. These findings elucidate the mechanism of light-regulated ion migration in CsPbBr₃, facilitating optimization of the perovskite device stability and performance.

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光照对金属卤化物钙钛矿中离子迁移的调控

利用大电显微镜和纳米显微镜研究了CsPbBr3钙钛矿在直流或交流偏压下的离子迁移，这对器件的稳定性和性能至关重要。直流测量表明，光照抑制偏置引起的离子迁移，将电流下降幅度（ΔI/I）从60.68%（黑暗）降低到18.19% (3.80 mW/cm2)，这归因于光产生的载流子钝化空位。光电流原子力显微镜显示晶界是光作用下的优先迁移路径，其机械功耗散比晶粒高9.6倍。在交流偏压下，光照增强了极化，在压电响应力显微镜下显示+8°的面外相移，并增加了表面电位（开尔文探针力显微镜：2.35 V暗至3.27 V），证实了光促进离子通过偏振调制迁移。这些发现阐明了光调控离子在CsPbBr3中的迁移机制，有助于优化钙钛矿器件的稳定性和性能。

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来源期刊

The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

9.60

自引率

7.00%

发文量

1519

审稿时长

1.6 months

期刊介绍： The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.