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Observation of a phonon bottleneck in copper-doped colloidal quantum dots

文献类型：期刊论文

作者Wang, Lifeng1,2,3; Chen, Zongwei2,3; Liang, Guijie4; Li, Yulu2,3; Lai, Runchen2,3; Ding, Tao2,3; Wu, Kaifeng2,3
刊名NATURE COMMUNICATIONS
出版日期2019-10-04
卷号10页码:8
ISSN号2041-1723
DOI10.1038/s41467-019-12558-y
通讯作者Wu, Kaifeng(kwu@dicp.ac.cn)
英文摘要Hot electrons can dramatically improve the efficiency of solar cells and sensitize energetically-demanding photochemical reactions. Efficient hot electron devices have been hindered by sub-picosecond intraband cooling of hot electrons in typical semiconductors via electron-phonon scattering. Semiconductor quantum dots were predicted to exhibit a "phonon bottleneck" for hot electron relaxation as their quantum-confined electrons would couple very inefficiently to phonons. However, typical cadmium selenide dots still exhibit sub-picosecond hot electron cooling, bypassing the phonon bottleneck possibly via an Auger-like process whereby the excessive energy of the hot electron is transferred to the hole. Here we demonstrate this cooling mechanism can be suppressed in copper-doped cadmium selenide colloidal quantum dots due to femtosecond hole capturing by copper-dopants. As a result, we observe a lifetime of similar to 8.6 picosecond for 1P(e) hot electrons which is more than 30-fold longer than that in same-sized, undoped dots (similar to 0.25 picosecond).
WOS关键词ULTRAFAST CARRIER DYNAMICS ; RELAXATION DYNAMICS ; SEMICONDUCTOR NANOCRYSTALS ; ELECTRONIC-STRUCTURE ; HOT CARRIERS ; SPECTROSCOPY ; EXTRACTION ; EFFICIENCY ; TRANSPORT ; LIMIT
资助项目Ministry of Science and Technology of China[2018YFA0208703] ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences[XDB17010100] ; National Natural Science Foundation of China[21773239] ; National Natural Science Foundation of China[21803070] ; National Natural Science Foundation of China[51961165109] ; LiaoNing Revitalization Talents Program[XLYC1807154]
WOS研究方向Science & Technology - Other Topics
语种英语
出版者NATURE PUBLISHING GROUP
WOS记录号WOS:000489013800001
资助机构Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; LiaoNing Revitalization Talents Program ; LiaoNing Revitalization Talents Program ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; LiaoNing Revitalization Talents Program ; LiaoNing Revitalization Talents Program ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; LiaoNing Revitalization Talents Program ; LiaoNing Revitalization Talents Program ; Ministry of Science and Technology of China ; Ministry of Science and Technology of China ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; Strategic Pilot Science and Technology Project of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; LiaoNing Revitalization Talents Program ; LiaoNing Revitalization Talents Program
源URL[http://cas-ir.dicp.ac.cn/handle/321008/172388]  
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.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, State Key Lab Mol React Dynam, Dalian 116023, Liaoning, Peoples R China
3.Chinese Acad Sci, Dynam Res Ctr Energy & Environm Mat, Dalian Inst Chem Phys, Dalian 116023, Liaoning, Peoples R China
4.Hubei Univ Arts & Sci, Hubei Key Lab Low Dimens Optoelect Mat & Devices, Xiangyang 441053, Hubei, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Lifeng,Chen, Zongwei,Liang, Guijie,et al. Observation of a phonon bottleneck in copper-doped colloidal quantum dots[J]. NATURE COMMUNICATIONS,2019,10:8.
APA Wang, Lifeng.,Chen, Zongwei.,Liang, Guijie.,Li, Yulu.,Lai, Runchen.,...&Wu, Kaifeng.(2019).Observation of a phonon bottleneck in copper-doped colloidal quantum dots.NATURE COMMUNICATIONS,10,8.
MLA Wang, Lifeng,et al."Observation of a phonon bottleneck in copper-doped colloidal quantum dots".NATURE COMMUNICATIONS 10(2019):8.

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来源：大连化学物理研究所

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