Real‐Time Observation of Order‐Disorder Transformation of Organic Cations Induced Phase Transition and Anomalous Photoluminescence in Hybrid Perovskites
Real‐Time Observation of Order‐Disorder Transformation of Organic Cations Induced Phase Transition and Anomalous Photoluminescence in Hybrid Perovskites
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DOI：
10.1002/adma.201705801
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发表时间：
2018-05
影响因子：
29.4
通讯作者：
Bin Yang;Wenmei Ming;M. Du;J. Keum;A. Puretzky;C. Rouleau;Jinsong Huang;D. Geohegan;Xiaoping Wang;Kai Xiao
中科院分区：
文献类型：
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作者：
Bin Yang;Wenmei Ming;M. Du;J. Keum;A. Puretzky;C. Rouleau;Jinsong Huang;D. Geohegan;Xiaoping Wang;Kai Xiao
了解有机-无机杂化钙钛矿材料的微观结构和宏观光电性能之间的相互作用，对于设计新材料和提高器件性能至关重要。然而，有机阳离子究竟如何影响材料的结构相变和光电子性能还不是很清楚。在这里，实时、原位温度相关的中子/X射线衍射和光致发光（PL）测量揭示了CH3NH3 +钙钛矿中有机阳离子CH3NH3 +随着温度的升高从有序到无序的转变。CH3NH3 +在分子水平上有序到无序的转变不仅导致了PL强度的异常增加，而且导致了多域到单域的结构转变。这一发现确立了有机阳离子有序在决定杂化钙钛矿结构有序和异常光电现象中的重要作用。
A fundamental understanding of the interplay between the microscopic structure and macroscopic optoelectronic properties of organic‐inorganic hybrid perovskite materials is essential to design new materials and improve device performance. However, how exactly the organic cations affect the structural phase transition and optoelectronic properties of the materials is not well understood. Here, real‐time, in situ temperature‐dependent neutron/X‐ray diffraction and photoluminescence (PL) measurements reveal a transformation of the organic cation CH3NH3 + from order to disorder with increasing temperature in CH3NH3PbBr3 perovskites. The molecular‐level order‐to‐disorder transformation of CH3NH3 + not only leads to an anomalous increase in PL intensity, but also results in a multidomain to single‐domain structural transition. This discovery establishes the important role that organic cation ordering has in dictating structural order and anomalous optoelectronic phenomenon in hybrid perovskites.