Visualizing Phase Segregation in Mixed-Halide Perovskite Single Crystals

被引:99
作者
Mao, Wenxin [1 ,2 ]
Hall, Christopher R. [2 ,3 ]
Chesman, Anthony S. R. [2 ,4 ,5 ]
Forsyth, Craig [6 ]
Cheng, Yi-Bing [2 ,7 ]
Duffy, Noel W. [8 ]
Smith, Trevor A. [2 ,3 ]
Bach, Udo [1 ,2 ,5 ]
机构
[1] Monash Univ, Dept Chem Engn, Clayton, Vic, Australia
[2] Australian Res Council, Ctr Excellence Exciton Sci, Parkville, Vic, Australia
[3] Univ Melbourne, Sch Chem, Parkville, Vic, Australia
[4] CSIRO Mfg, Clayton, Vic, Australia
[5] Melbourne Ctr Nanofabricat, Melbourne, Vic, Australia
[6] Monash Univ, Sch Chem, Clayton, Vic, Australia
[7] Monash Univ, Dept Mat & Sci Engn, Clayton, Vic 3800, Australia
[8] CSIRO Energy, Clayton, Vic, Australia
基金
澳大利亚研究理事会;
关键词
lifetime; perovskites; phase segregation; photoluminescence; single crystals; IODIDE; MANAGEMENT; EFFICIENT;
D O I
10.1002/anie.201810193
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Mixed organolead halide perovskites (MOHPs), CH3NH3Pb(BrxI1-x)(3), have been shown to undergo phase segregation into iodide-rich domains under illumination, which presents a major challenge to their development for photovoltaic and light-emitting devices. Recent work suggested that phase-segregated domains are localized at crystal boundaries, driving investigations into the role of edge structure and the growth of larger crystals with reduced surface area. Herein, a method for growing large (30 x 30 x 1 mu m(3)) monocrystalline MAPb(BrxI1-x)(3) single crystals is presented. The direct visualization of the growth of nanocluster-like I-rich domains throughout the entire crystal revealed that grain boundaries are not required for this transformation. Narrowband fluorescence imaging and time-resolved spectroscopy provided new insight into the nature of the phase-segregated domains and the collective impact on the optoelectronic properties.
引用
收藏
页码:2893 / 2898
页数:6
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