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Permanent Lattice Compression of Lead-Halide Perovskite for Persistently Enhanced Optoelectronic Properties
ACS Energy Letters ( IF 22.0 ) Pub Date : 2020-01-31 , DOI: 10.1021/acsenergylett.9b02810
Karunakara Moorthy Boopathi 1 , Beatriz Martín-García 2 , Aniruddha Ray 1, 3 , Joao M. Pina 4 , Sergio Marras 5 , Makhsud I. Saidaminov 4, 6 , Francesco Bonaccorso 2 , Francesco Di Stasio 1 , Edward H. Sargent 4 , Liberato Manna 1 , Ahmed L. Abdelhady 1
Affiliation  

Under mild mechanical pressure, halide perovskites show enhanced optoelectronic properties. However, these improvements are reversible upon decompression, and permanent enhancements have yet to be realized. Here, we report antisolvent-assisted solvent acidolysis crystallization that enables us to prepare methylammonium lead bromide single crystals showing intense emission at all four edges under ultraviolet light excitation. We study structural variations (edge-vs-center) in these crystals using micro-X-ray diffraction and find that the enhanced emission at the edges correlates with lattice compression compared to in the central areas. Time-resolved photoluminescence measurements show much longer-lived photogenerated carriers at the compressed edges, with radiative component lifetimes of ∼1.4 μs, 10 times longer than at the central regions. The properties of the edges are exploited to fabricate planar photodetectors exhibiting detectivities of 3 × 1013 Jones, compared to 5 × 1012 Jones at the central regions. The enhanced lifetimes and detectivities correlate to the reduced trap state densities and the formation of shallower traps at the edges due to lattice compression.

中文翻译:

永久卤化钙钛矿的晶格压缩永久增强光电性能

在适度的机械压力下,卤化物钙钛矿显示出增强的光电性能。但是,这些改进在减压时是可逆的,并且尚未实现永久性的改进。在这里,我们报道了抗溶剂辅助的溶剂酸解结晶,该结晶使我们能够制备甲基铵溴化铅单晶,在紫外光激发下在所有四个边缘处均显示出强烈的发射。我们使用微X射线衍射研究了这些晶体的结构变化(边缘与中心),发现与中心区域相比,边缘处的增强发射与晶格压缩相关。时间分辨的光致发光测量结果显示,压缩边缘的光生载流子寿命更长,辐射分量寿命约为1.4μs,是中心区域的10倍。13琼斯,而中部地区为5×10 12琼斯。寿命和检测率的提高与陷阱态密度的降低以及由于晶格压缩而在边缘处形成较浅陷阱的现象有关。
更新日期:2020-02-03
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