Nature of Photoinduced Quenching Traps in Methylammonium Lead Triiodide Perovskite Revealed by Reversible Photoluminescence Decline
Nature of Photoinduced Quenching Traps in Methylammonium Lead Triiodide Perovskite Revealed by Reversible Photoluminescence Decline
复制标题
可逆光致发光衰减揭示甲基铵三碘化铅钙钛矿中光致猝灭陷阱的性质
DOI：
10.1021/acsphotonics.7b01537
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发表时间：
2018-05-01
期刊：
影响因子：
7
通讯作者：
Tian, Yuxi
中科院分区：
文献类型：
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作者：
Hong, Daocheng;Zhou, Yipeng;Tian, Yuxi
有机金属卤化物钙钛矿的光致发光（PL）已被广泛研究，作为理解这些材料的光物理的基本信号。复杂的PL行为已被报道，反映了复杂的机制，包括晶体缺陷/陷阱的性质仍然不清楚的影响。在这项工作中，除了PL增强之外，我们还观察到甲基铵三碘化铅（CH 3 NH3 PbI 3）钙钛矿中令人惊讶的PL下降现象，其显示出高的初始PL强度，随后是毫秒到秒的时间尺度的快速下降。PL增强和PL下降之间的相似性表明这两个过程是由于材料中的PL猝灭陷阱。结合实验和理论结果，碘和铅的间隙缺陷被确定为负责PL增强和PL下降，分别。这两个陷阱可以在激活和非激活状态之间切换，导致PL增强和PL下降的可逆过程。The identifi.
Photoluminescence (PL) of organometal halide perovskite has been broadly investigated as a fundamental signal to understand the photophysics of these materials. Complicated PL behaviors have been reported reflecting complex mechanisms including effects from crystal defects/traps whose nature still remains unclear. Here in this work we observed, besides the PL enhancement, a surprising PL decline phenomenon in methylammonium lead triiodide (CH3NH3PbI3) perovskite showing a high initial PL intensity followed by a fast decline in time scale of milliseconds to seconds. The similarity between the PL enhancement and PL decline suggests both processes are due to PL quenching traps in the material. Combining experimental and theoretical results, two interstitial defects of iodide and lead were identified to be responsible for the PL enhancement and PL decline, respectively. Both traps can be switched between active and inactive states, leading to a reversible process of PL enhancement and PL decline. The identifi...