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On the absence of a phonon bottleneck in strongly confined CsPbBr3 perovskite nanocrystals

文献类型：期刊论文

作者Li, Yulu1,2; Lai, Runchen1; Luo, Xiao1; Liu, Xue1; Ding, Tao1; Lu, Xin2; Wu, Kaifeng1
刊名CHEMICAL SCIENCE
出版日期2019-06-21
卷号10期号:23页码:5983-5989
ISSN号2041-6520
DOI10.1039/c9sc01339c
通讯作者Wu, Kaifeng(kwu@dicp.ac.cn)
英文摘要In traditional solar cells, photogenerated energetic carriers (so-called hot carriers) rapidly relax to band edges via emission of phonons, prohibiting the extraction of their excess energy above the band gap. Quantum confined semiconductor nanocrystals, or quantum dots (QDs), were predicted to have long-lived hot carriers enabled by a phonon bottleneck, i.e., the large inter-level spacings in QDs should result in inefficient phonon emissions. Here we study the effect of quantum confinement on hot carrier/ exciton lifetime in lead halide perovskite nanocrystals. We synthesized a series of strongly confined CsPbBr3 nanocrystals with edge lengths down to 2.6 nm, the smallest reported to date, and studied their hot exciton relaxation using ultrafast spectroscopy. We observed sub-ps hot exciton lifetimes in all the samples with edge lengths within 2.6-6.2 nm and thus the absence of a phonon bottleneck. Their wellresolved excitonic peaks allowed us to quantify hot carrier/ exciton energy loss rates which increased with decreasing NC sizes. This behavior can be well reproduced by a nonadiabatic transition mechanism between excitonic states induced by coupling to surface ligands.
WOS关键词DEPENDENT STOKES SHIFT ; RELAXATION DYNAMICS ; ENERGY RELAXATION ; HOT-ELECTRONS ; QUANTUM DOTS ; EXCITONS ; CARRIERS ; EFFICIENCY ; LIQUIDS ; CSPBX3
资助项目Strategic Pilot Science and Technology Project of Chinese Academy of Sciences[XDA21010206] ; Ministry of Science and Technology of China[2018YFA028703] ; National Natural Science Foundation of China[21773239]
WOS研究方向Chemistry
语种英语
WOS记录号WOS:000471133800013
出版者ROYAL SOC CHEMISTRY
资助机构Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://cas-ir.dicp.ac.cn/handle/321008/175998]  
专题大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者Wu, Kaifeng
作者单位1.Chinese Acad Sci, Dalian Inst Chem Phys, Dynam Res Ctr Energy & Environm Mat, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
2.Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Xiamen 361005, Fujian, Peoples R China
推荐引用方式
GB/T 7714		 Li, Yulu,Lai, Runchen,Luo, Xiao,et al. On the absence of a phonon bottleneck in strongly confined CsPbBr3 perovskite nanocrystals[J]. CHEMICAL SCIENCE,2019,10(23):5983-5989.
APA Li, Yulu.,Lai, Runchen.,Luo, Xiao.,Liu, Xue.,Ding, Tao.,...&Wu, Kaifeng.(2019).On the absence of a phonon bottleneck in strongly confined CsPbBr3 perovskite nanocrystals.CHEMICAL SCIENCE,10(23),5983-5989.
MLA Li, Yulu,et al."On the absence of a phonon bottleneck in strongly confined CsPbBr3 perovskite nanocrystals".CHEMICAL SCIENCE 10.23(2019):5983-5989.

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来源：大连化学物理研究所

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