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Photophysical properties of micron-sized CH3NH3PbBr3 single crystals
Chemical Physics ( IF 2.3 ) Pub Date : 2020-05-12 , DOI: 10.1016/j.chemphys.2020.110852
Wei-Long Xu , Min Zheng , Weibai Bian , Chuan Ding , Lei Chen , Jin Xiao

Perovskite crystals have shown potential applications in lasers, solar cells and functional electronics. Micron-sized CH3NH3PbBr3 single crystals were fabricated with antisolvent method in this work. The photoluminescence dynamics of perovskite microcrystals were investigated in the temperature range from 77 K to 300 K. The fluorescence intensity of perovskite microcrystals decreases as the temperature increases. At the same time, the full width at half maximum of fluorescence peak is broadened, accompanied by the red shift of the peak position. These are attributed to the phase transition and enhanced scattering effect between exciton and phonon. The fluorescence lifetime of perovskite microcrystals decreases as the excitation intensity increases, indicating that exciton-exciton annihilation dominates the recombination process. Spatially and temporally fluorescence measurements show the different recombination processes in single perovskite microcrystal owing to the different density of defect states at the surface and the bulk regions.



中文翻译:

微米级CH 3 NH 3 PbBr 3单晶的光物理性质

钙钛矿晶体已显示出在激光,太阳能电池和功能性电子产品中的潜在应用。微米级CH 3 NH 3 PbBr 3在这项工作中,用抗溶剂法制备了单晶。在77 K至300 K的温度范围内研究了钙钛矿微晶的光致发光动力学。随着温度的升高,钙钛矿微晶的荧光强度降低。同时,荧光峰的半峰全宽变宽,伴随着峰位置的红移。这些归因于激子与声子之间的相变和增强的散射效应。钙钛矿微晶的荧光寿命随着激发强度的增加而降低,表明激子-激子an灭主导了复合过程。

更新日期:2020-05-12
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