Direct Observation of Photoinduced Ion Migration in Lead Halide Perovskites,Advanced Functional Materials

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Direct Observation of Photoinduced Ion Migration in Lead Halide Perovskites
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-11-25 , DOI: 10.1002/adfm.202008777
Yongtao Liu _{1,

2} , Anton V. Ievlev ₁ , Nikolay Borodinov ₁ , Matthias Lorenz ₁ , Kai Xiao ₁ , Mahshid Ahmadi ₂ , Bin Hu ₂ , Sergei V. Kalinin ₁ , Olga S. Ovchinnikova ₁

Affiliation

Unique optoelectronic, electronic, and sensing properties of hybrid organic–inorganic perovskites (HOIPs) are underpinned by the complex interactions between electronic and ionic states. Here, the photoinduced field ion migration in HOIPs is directly observed. Using newly developed local probe time‐resolved techniques, more significant CH₃NH₃⁺ migration than I⁻/Br⁻ migration in HOIPs is unveiled. It is found that light illumination only induces CH₃NH₃⁺ migration but not I⁻/Br⁻ migration. By directly observing temporal changes in bias‐induced and photoinduced ion migration in device conditions, it is revealed that light illumination suppresses the bias‐induced ion redistribution in the lateral device. These findings, being a necessary compensation of previous understandings of ion migration in HOIPs based on simulations and static and/or indirect measurements, offer advanced insights into the distinct light effects on the migration of organic cation and halides in HOIPs, which are expected to be helpful for improving the performance and the long‐term stability of HOIPs optoelectronics.

中文翻译：

卤化钙钛矿中光诱导离子迁移的直接观察

电子-离子态之间复杂的相互作用支撑了有机-无机钙钛矿杂化物（HOIP）的独特光电，电子和传感特性。在这里，直接观察到HOIPs中的光致场离子迁移。采用新开发的地方探测时间分辨技术，更显著CH ₃ NH ₃⁺迁移比我^- /溴^-在HOIPs迁移亮相。据发现，光照射仅诱导CH ₃ NH ₃⁺迁移但不我^- /溴^-移民。通过直接观察器件条件下偏压引起的离子迁移和光诱导离子迁移的时间变化，发现光照射抑制了侧向器件中偏压引起的离子重新分布。这些发现是对以前基于模拟和静态和/或间接测量对HOIPs中离子迁移的理解的必要补偿，它们提供了对HOIPs中有机阳离子和卤化物迁移的独特光影响的高级见解，预计这将是有助于改善HOIP光电的性能和长期稳定性。

更新日期：2020-11-25

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