Guan-xin Yao, Zai-xi Fu, Xian-yi Zhang, Xian-feng Zheng, Xue-han Ji, Zhi-feng Cui, Hong Zhang. Ultrafast Carrier Dynamics in CdSe/CdS/ZnS Quantum Dots[J]. Chinese Journal of Chemical Physics , 2011, 24(6): 640-646. doi: 10.1088/1674-0068/24/06/640-646
Citation: Guan-xin Yao, Zai-xi Fu, Xian-yi Zhang, Xian-feng Zheng, Xue-han Ji, Zhi-feng Cui, Hong Zhang. Ultrafast Carrier Dynamics in CdSe/CdS/ZnS Quantum Dots[J]. Chinese Journal of Chemical Physics , 2011, 24(6): 640-646. doi: 10.1088/1674-0068/24/06/640-646

Ultrafast Carrier Dynamics in CdSe/CdS/ZnS Quantum Dots

doi: 10.1088/1674-0068/24/06/640-646
Funds:  This work was supported by the National Natural Sci-ence Foundation of China (No.11074003) and the Key Program of Educational Commission of Anhui Province of China (No.KJ2010A132). For the help of Prof. J. L.Zhao at Changchun Institute of Optics, Fine Mechan-ics and Physics, Chinese Academy of Sciences in sample preparation is greatly appreciated.
  • Received Date: 2011-05-24
  • 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 thatultrafast spectroscopy might be a suitable tool in studying interface and surface morphology properties in nanosystems.
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Ultrafast Carrier Dynamics in CdSe/CdS/ZnS Quantum Dots

doi: 10.1088/1674-0068/24/06/640-646
Funds:  This work was supported by the National Natural Sci-ence Foundation of China (No.11074003) and the Key Program of Educational Commission of Anhui Province of China (No.KJ2010A132). For the help of Prof. J. L.Zhao at Changchun Institute of Optics, Fine Mechan-ics and Physics, Chinese Academy of Sciences in sample preparation is greatly appreciated.

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 thatultrafast spectroscopy might be a suitable tool in studying interface and surface morphology properties in nanosystems.

Guan-xin Yao, Zai-xi Fu, Xian-yi Zhang, Xian-feng Zheng, Xue-han Ji, Zhi-feng Cui, Hong Zhang. Ultrafast Carrier Dynamics in CdSe/CdS/ZnS Quantum Dots[J]. Chinese Journal of Chemical Physics , 2011, 24(6): 640-646. doi: 10.1088/1674-0068/24/06/640-646
Citation: Guan-xin Yao, Zai-xi Fu, Xian-yi Zhang, Xian-feng Zheng, Xue-han Ji, Zhi-feng Cui, Hong Zhang. Ultrafast Carrier Dynamics in CdSe/CdS/ZnS Quantum Dots[J]. Chinese Journal of Chemical Physics , 2011, 24(6): 640-646. doi: 10.1088/1674-0068/24/06/640-646

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