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Nature of Photoinduced Quenching Traps in Methylammonium Lead Triiodide Perovskite Revealed by Reversible Photoluminescence Decline
ACS Photonics ( IF 7 ) Pub Date : 2018-03-11 00:00:00 , DOI: 10.1021/acsphotonics.7b01537
Daocheng Hong 1 , Yipeng Zhou 1 , Sushu Wan 1 , Xixi Hu 1 , Daiqian Xie 1 , Yuxi Tian 1
Affiliation  

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 identification of the chemical nature of the PL quenching traps is an important step toward fully understanding the crystals defects in these materials.

中文翻译:

可逆光致发光下降揭示了甲基铵三碘化铅钙钛矿中光诱导猝灭陷阱的性质。

广泛研究了有机金属卤化物钙钛矿的光致发光(PL),作为了解这些材料的光物理性质的基本信号。据报道,复杂的PL行为反映了复杂的机制,包括晶体缺陷/陷阱的影响,其性质仍不清楚。在此工作中,我们观察到,除了PL增强外,甲基碘三碘化铅(CH 3 NH 3 PbI 3钙钛矿显示出较高的初始PL强度,随后时间范围从几毫秒到几秒钟迅速下降。PL增强和PL下降之间的相似性表明这两个过程都是由于材料中的PL猝灭陷阱引起的。结合实验和理论结果,鉴定出碘化物和铅的两个间隙缺陷分别是造成PL升高和PL下降的原因。两个陷阱都可以在活动状态和非活动状态之间切换,从而导致PL增强和PL下降的可逆过程。鉴定PL猝灭阱的化学性质是全面了解这些材料中晶体缺陷的重要一步。
更新日期:2018-03-11
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