DICP OpenIR
On the absence of a phonon bottleneck in strongly confined CsPbBr3 perovskite nanocrystals
Li, Yulu1,2; Lai, Runchen1; Luo, Xiao1; Liu, Xue1; Ding, Tao1; Lu, Xin2; Wu, Kaifeng1
Corresponding AuthorWu, Kaifeng(kwu@dicp.ac.cn)
Source PublicationCHEMICAL SCIENCE
2019-06-21
ISSN2041-6520
DOI10.1039/c9sc01339c
Volume10Issue:23Pages:5983-5989
Funding ProjectStrategic 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]
Funding OrganizationStrategic 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
WOS SubjectChemistry, Multidisciplinary
WOS Research AreaChemistry
WOS KeywordDEPENDENT STOKES SHIFT ; RELAXATION DYNAMICS ; ENERGY RELAXATION ; HOT-ELECTRONS ; QUANTUM DOTS ; EXCITONS ; CARRIERS ; EFFICIENCY ; LIQUIDS ; CSPBX3
AbstractIn 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.
Language英语
Funding OrganizationStrategic 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
WOS IDWOS:000471133800013
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/175999
Collection中国科学院大连化学物理研究所
Corresponding AuthorWu, Kaifeng
Affiliation1.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
Recommended Citation
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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