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Ultrafast carrier dynamics in CdTe/CdS Core/Shell quantum dots

Li Xia Feng Dong-Hai He Hong-Yan Jia Tian-Qing Shan Lu-Fan Sun Zhen-Rong Xu Zhi-Zhan

Ultrafast carrier dynamics in CdTe/CdS Core/Shell quantum dots

Li Xia, Feng Dong-Hai, He Hong-Yan, Jia Tian-Qing, Shan Lu-Fan, Sun Zhen-Rong, Xu Zhi-Zhan
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  • Received Date:  09 January 2012
  • Accepted Date:  01 April 2012

Ultrafast carrier dynamics in CdTe/CdS Core/Shell quantum dots

  • 1. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
  • 2. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Fund Project:  Project supported by the State Key Development Program for Basic Research of China (Grant No. 2010CB923203), the National Natural Science Foundation of China (Grant No. 10904038), and the Shanghai Municipal Science and Technology Commission (Grant Nos. 09JC1404700, 10PJ1403400, 11JC1403500).

Abstract: On the basic of the synthesis of CdTe/CdS core/shell quantum dots (QDs) in aqueous phase, we study ultrafast carrier dynamic behaviors of CdTe/CdS QDs with different shell thicknesses, by using femtosecond time-resolved transmission spectroscopy. The results show that both the buildup time of the lowest exciton state and its following relaxation time become longer as CdS shell thickness increases. The results also indicate that the buildup rate of a space-separate exciton is slower than that of a space-overlapped exciton, and that carrier relaxation changes from surface-defect related mechanism into surface-passivated charge separation regime, which is consistent with steady-state absorption and photoluminescence experiments.

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