Cathodoluminescence wavelength imaging of μm-scale energy variations in InAs/GaAs self-assembled quantum dots

被引：3
|
作者：
Rich, DH [1 ]
Zhang, C [1 ]
Mukhametzhanov, I [1 ]
Madhukar, A [1 ]
机构：
[1] Univ So Calif, Dept Mat Sci & Engn, Photon Mat & Devices Lab, Los Angeles, CA 90089 USA
来源：
APPLIED PHYSICS LETTERS | 2000年 / 76卷 / 24期
关键词：
D O I：
10.1063/1.126718
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Cathodoluminescence wavelength imaging of InAs/GaAs self-assembled quantum dots (SAQDs) was performed to study the spatial variation in the spectral line shape of the broadened quantum dot (QD) ensemble. The line shape was found to vary on a scale of similar to mu m, revealing attendant variations in the size distribution of SAQD clusters on this spatial scale. Energy variations in clusters of SAQDs are found to exhibit a spatial correlation with the efficiency of luminescence and the activation energy for thermal re-emission of carriers. A reduction in the energy variation of the QD clusters occurs when the thickness of the spacer layers in vertically self-organized samples is reduced or the number of stacks is increased. (C) 2000 American Institute of Physics. [S0003-6951(00)01823-4].
引用
收藏
页码：3597 / 3599
页数：3
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