文章基本信息

标题：Inhibition of Phase Segregation in Cesium Lead Mixed-Halide Perovskites by B-Site Doping
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作者：Daocheng Hong ; Peiyang Zhao ; Yu Du 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2020
卷号：23
期号：8
页码：1-26
DOI：10.1016/j.isci.2020.101415
语种：English
出版社：Elsevier
摘要：SummaryThe emergence of all-inorganic halide perovskites has shown great potential in photovoltaic and optoelectronic devices. However, the photo-induced phase segregation in lead mixed-halide perovskites has severely limited their application. Herein, by real-time monitoring the photoluminescence (PL) spectra of metal mixed-halide perovskites under light irradiation, we found that the photo-induced phase transition can be significantly inhibited by B-site doping. For pristine mixed-halide perovskites, an intermediate phase of CsPbBrxI3-xcan only be stabilized under low excitation power. After introducing Sn2+ions, such intermediate phase can be stabilized in nitrogen atmosphere under high excitation power and phase segregation can be started after the exposure in oxygen due to oxidization of Sn2+. Replacing Sn2+by Mn2+can further improve the intermediate phase's tolerance to oxygen proving that B-site doping in perovskites structure by Sn2+or Mn2+could effectively minimize the light-induced phase segregation and promote them to serve as promising candidates in photovoltaic and light-emitting devices.Graphical AbstractDisplay OmittedHighlights•Phase segregation process of perovskite materials can be real-time monitored by PL•Sn2+/Mn2+doping can significantly improve the phase stability of CsPbIxBr3-x•Mn2+doping brings CsPbIxBr3-xhigher tolerance to oxygen and moistureElectrical Property; Optical Property; Devices