Optical Analysis of a series of Size and Shape-controlled Type-II CdTe/CdSe/CdTe Heterostructure Nanorods

作     者：Hongming Zhao Bonil Koo J L Movilla Dongmin Chen Brian A Korgel Kuntheak Kheng 

作者机构：Nanophysics and Semiconductor Group CEA/CNRS/Université Joseph Fourier Institut Néel 38054 Grenoble Cedex 9 France Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences 100190 Beijing People's Republic of China Department of Chemical Engineering Center for Nano- and Molecular Science and Technology and Texas Materials Institute University of Texas Austin TX 78712 USA Department of Physical and Analytical Chemistry University Jaume-I E-12080 Castelló Spain 

出 版 物：《Journal of Physics: Conference Series》 

年 卷 期：2010年第245卷第1期

学科分类：07[理学] 0702[理学-物理学] 

摘      要：Two series of size and shape-controlled type-II CdTe/CdSe/CdTe heterostructure nanorods with different geometrical structures were prepared by the colloidal sequential reactant injection technique. The samples, including pure CdSe seeds, were optically analysed by steady state and time resolved photoluminescence spectra. The experimental results demonstrate that the energy and lifetime of the photoluminescence from charge-separated band structure can be tuned by the nature of nanorods band edges in both linear and core-shell heterostructure nanorods. But between different groups of nanorod samples, the spectral properties show different variation tendencies with the increasing CdTe tip. As one possible explanation, the compensation between the variations of kinetic and Coulomb contributions was discussed by numerical calculations based on the effective mass and envelope function approximations.