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2D/3D钙钛矿异质结中多重量子阱的形成使声子瓶颈效应失效
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作者 杨哲 朱仁龙 +3 位作者 郑晓萱 裴权炳 谈军军 叶树集 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2023年第6期631-638,I0001-I0006,I0055,共15页
声子瓶颈效应对有机-无机杂化钙钛矿光电性能的重要性已经广为认知.虽然在2D/3D异质结构中经常产生随机分布的多重量子阱结构,但人们对2D/3D钙钛矿异质结构中多重量子阱的形成对声子瓶颈效应的影响知之甚少.本文使用2D有机-无机杂化钙钛... 声子瓶颈效应对有机-无机杂化钙钛矿光电性能的重要性已经广为认知.虽然在2D/3D异质结构中经常产生随机分布的多重量子阱结构,但人们对2D/3D钙钛矿异质结构中多重量子阱的形成对声子瓶颈效应的影响知之甚少.本文使用2D有机-无机杂化钙钛矿(NH_(3)(CH_(2))_(8)NH_(3)PbI_(4))去钝化3D有机-无机杂化钙钛矿,构建了2D/3D钙钛矿异质结构,并通过光致发光光谱和飞秒光泵浦太赫兹探测光谱研究了其激子和载流子动力学.观察到了多重量子阱结构的形成,并建立了激子形成时间、热载流子冷却速率和有效电荷载流子迁移率之间的结构-动力学-性能的构效关系.多重量子阱结构的形成可使声子瓶颈效应失效,并且调控2D/3D钙钛矿异质结的光电性能.该工作为构建2D/3D钙钛矿异质结构策略中认识能带排列和声子瓶颈效应的重要性提供有价值的信息. 展开更多
关键词 有机无机杂化钙钛矿 能带排列 多重量子阱 光泵浦太赫兹探测光谱
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Sum Frequency Generation Vibrational Spectra of Perovskite Nanocrystals at the Single-Nanocrystal and Ensemble Levels
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作者 Renlong Zhu Quanbing Pei +2 位作者 Junjun Tan xiaoxuan zheng Shuji Ye 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2022年第5期738-746,I0001-I0003,I0011,共13页
Determination of molecular structures of organicinorganic hybrid perovskite(OIHP)nanocrystals at the single-nanocrystal and ensemble levels is essential to understanding the mechanisms responsible for their size-depen... Determination of molecular structures of organicinorganic hybrid perovskite(OIHP)nanocrystals at the single-nanocrystal and ensemble levels is essential to understanding the mechanisms responsible for their size-dependent optoelectronic properties and the nanocrystal assembling process,but its detection is still a bit challenging.In this study,we demonstrate that femtosecond sum frequency generation(SFG)vibrational spectroscopy can provide a highly sensitive tool for probing the molecular structures of nanocrystals with a size comparable to the Bohr diameter(∼10 nm)at the single-nanocrystal level.The SFG signals are monitored using the spectral features of the phenyl group in(RMBA)PbBr_(3) and(R-MBA)_(2)PbI_(4) nanocrystals(MBA:methyl-benzyl-ammonium).It is found that the SFG spectra exhibit a strong resonant peak at 3067±3 cm^(−1)(ν2 mode)and a weak shoulder peak at 3045±4 cm^(−1)(ν_(7a) mode)at the ensemble level,whereas a peak of theν2 mode and a peak at 3025±3 cm^(−1)(ν20b mode)at the single-nanocrystal level.The nanocrystals at the single-nanocrystal level tend to lie down on the surface,but stand up as the ensemble number and the averaged sizes increase.This finding may provide valuable information on the structural origins for size-dependent photo-physical properties and photoluminescence blinking dynamics in nanocrystals. 展开更多
关键词 PEROVSKITE Single nanocrystal Sum frequency generation vibrational spectroscopy Size-dependent property
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