Ultrafast Carrier Dynamics in CdSe/CdS/ZnS Quantum Dots  

CdSe／CdS／ZnS最子点体系中的超快载流子动力学

作　　者：姚关心[1,2] 伏再喜[1] 张先燚[2] 郑贤锋[2] 季学韩[2] 崔执凤[1,2] 张宏[3] 

机构地区：[1]中国科学院安徽光学精密机械研究所,合肥230031 [2]安徽师范大学原子与分子物理研究所,芜湖241000 [3]荷兰阿姆斯特丹大学分了科学院,阿姆斯特丹166-1018

出　　处：《Chinese Journal of Chemical Physics》2011年第6期640-646,I0003,共8页化学物理学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China （No.11074003） and the Key Program of Educational Commission of Anhui Province of China （No.KJ2010AI32）. For the help of Prof. J. L. Zhao at Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences in sample preparation is greatly appreciated.

摘　　要：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.

关 键 词：CdSe/CdS/ZnS quantum dot Femtosecond pump-probe technique Ultrafastcarrier dynamics Transient transmission spectra 

分 类 号：O64[理学—物理化学]