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Competition between Oxygen Curing and Ion Migration in MAPbI3 Induced by Irradiation Exposure.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-09-23 , DOI: 10.1021/acs.jpclett.0c02649 Xin Wei 1 , Yong Zhang 1 , Ting Zheng 1 , Lei Gao 1 , Jie Jiang 1 , Weiwei Zhao 1 , Hongwei Liu 2 , Junpeng Lu 1 , Zhenhua Ni 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-09-23 , DOI: 10.1021/acs.jpclett.0c02649 Xin Wei 1 , Yong Zhang 1 , Ting Zheng 1 , Lei Gao 1 , Jie Jiang 1 , Weiwei Zhao 1 , Hongwei Liu 2 , Junpeng Lu 1 , Zhenhua Ni 1
Affiliation
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Organometal halide perovskites (OHPs) have been considered as promising materials for light-emission devices. However, the factors influencing the luminescent property of OHPs are intricate. It is not only affected by the intrinsic crystalline quality but also depends on the surrounding environment. Here we demonstrate that the luminescence of CH3NH3PbI3 (MAPbI3) is governed by light-irradiation-induced oxygen curing and vacancy-mediated ion migration. The luminescence increases under continuous irradiation because of the curing of iodine vacancies (VI) by oxygen. While, it decreases with enhanced ion migration, which would induce excess trap states. The existence of VI is proved by low-temperature photoluminescence (PL) spectra, the hysteresis effect in J–V curves, and the excitation density dependence of the PL lifetime. Different oxygen environments and applied biases are employed to control the degree of oxygen curving and ion migration. These results provide a perception of the correlation of the complicated influencing factors affecting the luminescence of OHPs.
中文翻译：
辐照诱导氧固化与MAPbI3中离子迁移之间的竞争。
有机金属卤化物钙钛矿（OHP）被认为是发光器件的有前途的材料。然而，影响OHPs发光性能的因素是复杂的。它不仅受固有晶体质量的影响，而且还取决于周围的环境。在这里，我们证明，CH的发光3 NH 3碘化铅3（MAPbI 3）由光照射引起的氧固化和空位介导的离子迁移支配。由于氧气使碘空位（V I）固化，因此在连续照射下发光增加。同时，它会随着离子迁移的增强而降低，这会引起过多的陷阱态。V I的存在低温光致发光（PL）光谱，J – V曲线中的磁滞效应以及PL寿命的激发密度依赖性证明了这一点。采用不同的氧气环境和施加的偏压来控制氧气弯曲和离子迁移的程度。这些结果提供了影响OHP发光的复杂影响因素的相关性的认识。
更新日期：2020-10-16
中文翻译：
辐照诱导氧固化与MAPbI3中离子迁移之间的竞争。
有机金属卤化物钙钛矿（OHP）被认为是发光器件的有前途的材料。然而，影响OHPs发光性能的因素是复杂的。它不仅受固有晶体质量的影响，而且还取决于周围的环境。在这里，我们证明，CH的发光3 NH 3碘化铅3（MAPbI 3）由光照射引起的氧固化和空位介导的离子迁移支配。由于氧气使碘空位（V I）固化，因此在连续照射下发光增加。同时，它会随着离子迁移的增强而降低，这会引起过多的陷阱态。V I的存在低温光致发光（PL）光谱，J – V曲线中的磁滞效应以及PL寿命的激发密度依赖性证明了这一点。采用不同的氧气环境和施加的偏压来控制氧气弯曲和离子迁移的程度。这些结果提供了影响OHP发光的复杂影响因素的相关性的认识。
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