Intrinsic Ion Migration Dynamics in a One-Dimensional Organic Metal Halide Hybrid
Intrinsic Ion Migration Dynamics in a One-Dimensional Organic Metal Halide Hybrid
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DOI：
10.1021/acsenergylett.2c01710
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发表时间：
2022-10
影响因子：
22
通讯作者：
Zhenqi Hua;Azza Ben‐Akacha;Qingquan He;Tianhan Liu;G. Boyce;Margaret van Deventer;Xinsong Lin;Hanwei Gao;Biwu Ma;P. Xiong
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文献类型：
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作者：
Zhenqi Hua;Azza Ben‐Akacha;Qingquan He;Tianhan Liu;G. Boyce;Margaret van Deventer;Xinsong Lin;Hanwei Gao;Biwu Ma;P. Xiong
金属卤化物钙钛矿具有许多适合光电应用的物理性质，然而这些潜力的实现受到其环境和电子不稳定性的阻碍。形态和分子的低维钙钛矿及其相关材料由于其独特的分子结构，在提高化学稳定性方面显示出很大的前景。本文报道了一维（1D）有机金属卤化物杂化物(R)-α-甲基苄基铵三碘化铅（(R-α-MBA) pb3）的稳健性和可重复性的四端（4T）电测量。结果表明，单指数离子迁移具有明显的内在动态，这是其独特的4T - I-V特性的基础。通过对瞬态离子电流的实时测量直接验证了这种动态。我们的观察结果与光活化和场辅助离子迁移一致。所阐明的本征离子动力学可以为理解和模拟基于金属卤化物的电子器件中普遍存在的迟滞提供物理基础，并为金属卤化物钙钛矿和杂化物中的离子迁移动力学提供新的见解。
Metal halide perovskites possess many physical properties amenable to optoelectronic applications, whereas the realization of these potentials has been hampered by their environmental and electronic instabilities. The morphological and molecular low dimensional perovskites and perovskite related materials have shown much promise in enhancing the chemical stability due to their unique molecular structures. Here we report on robust and reproducible four-terminal (4T) electrical measurements in a one-dimensional (1D) organic metal halide hybrid, (R)-α-methylbenzylammonium lead triiodide ((R-α-MBA)PbI 3 ) made possible by its chemical stability. The results reveal a distinct intrinsic ion migration dynamic of single exponential, which underlies the unique 4T I-V characteristics. The dynamic is directly verified by real-time measurements of the transient ionic current. Our observations are consistent with photo-activation and field-assisted ion migration. The elucidated intrinsic ion dynamics may provide the physical basis for understanding and modelling the ubiquitous hysteresis in metal halides based electronic devices and new insights into the dynamics of ion migration in metal halide perovskites and hybrids in general.