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Ultrafast Carrier Dynamics in CdSe/CdS/ZnS Quantum Dots
Guan-xin Yao,Zai-xi Fu,Xian-yi Zhang,Xian-feng Zheng,Xue-han Ji,Zhi-feng Cui*,Hong Zhang*
Author NameAffiliationE-mail
Guan-xin Yao Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Atomic and Molecular Physics, Anhui Normal University, Wuhu 241000, China  
Zai-xi Fu Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China  
Xian-yi Zhang Institute of Atomic and Molecular Physics, Anhui Normal University, Wuhu 241000, China  
Xian-feng Zheng Institute of Atomic and Molecular Physics, Anhui Normal University, Wuhu 241000, China  
Xue-han Ji Institute of Atomic and Molecular Physics, Anhui Normal University, Wuhu 241000, China  
Zhi-feng Cui* Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Atomic and Molecular Physics, Anhui Normal University, Wuhu 241000, China zfcui@mail.ahnu.edu.cn 
Hong Zhang* Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, Netherlands h.zhang@uva.nl 
Abstract:
The intra- and inter-band relaxation dynamics of CdSe/CdS/ZnS core/shell/shell quantum dots are investigated with the aid of time-resolved nonlinear transmission spectra which are obtained using femtosecond pump-probe technique. By selectively exciting the core and shell carrier, the dynamics are studied in detail. Carrier relaxation is found faster in the conduction band of the CdS shell (about 130 fs) than that in the conduction band of the CdSe core (about 400 fs). From the experiments it is distinctly demonstrated the existence of the defect states in the interface between the CdSe core and the CdS shell, indicating that ultrafast spectroscopy might be a suitable tool in studying interface and surface morphology properties in nanosystems.
Key words:  CdSe/CdS/ZnS quantum dot, Femtosecond pump-probe technique, Ultrafast carrier dynamics, Transient transmission spectrum
FundProject:
CdSe/CdS/ZnS 量子点体系中的超快载流子动力学
姚关心,伏再喜,张先燚,郑贤锋,季学韩,崔执凤*,张宏*
摘要:
利用飞秒泵浦探测技术对CdSe/CdS/ZnS量子点体系中的超快载流子动力学过程进行了研究. 通过选择不同波长的泵浦光分别激发样品壳层和核层,研究了载流子在壳层和核层中的超快动力学过程. 实验结果表明,载流子在CdS壳层导带中弛豫过程非常迅速(约130 fs),时间明显短于载流子在CdSe核层导带中的弛豫时间(约400 fs). 实验中也发现在CdS壳层和CdSe核层的分界面存在一定量的缺陷态.
关键词:  CdSe/CdS/ZnS,飞秒泵浦探测技术,超快载流子动力学,瞬态透射谱
DOI:10.1088/1674-0068/24/06/640-646
分类号: