標題: Optical properties of self-assembled ZnTe quantum dots grown by molecular-beam epitaxy
作者: Yang, CS
Lai, YJ
Chou, WC
Chen, WK
Lee, MC
Kuo, MC
Lee, J
Shen, JL
Jang, DJ
Cheng, YC
電子物理學系
Department of Electrophysics
公開日期: 1-Feb-2005
摘要: The morphology and the size-dependent photoluminescence (PL) spectra of the type-II ZnTe quantum dots (QDs) grown in a ZnSe matrix were obtained. The coverage of ZnTe varied from 2.5 to 3.5 monolayers (MLs). The PL peak energy decreased as the dot size increased. Excitation power and temperature-dependent PL spectra are used to characterize the optical properties of the ZnTe quantum dots. For 2.5- and 3.0-ML samples, the PL peak energy decreased monotonically as the temperature increased. However, for the 3.5-ML sample, the PL peak energy was initially blueshifted and then redshifted as the temperature increased above 40 K. Carrier thermalization and carrier transfer between QDs are used to explain the experimental data. A model of temperature-dependent linewidth broadening is employed to fit the high-temperature data. The activation energy, which was found by the simple PL intensity quenching model, of the 2.5, 3.0, and 3.5 MLs were determined to be 6.35, 9.40, and 18.87 meV, respectively. (C) 2005 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.1834985
http://hdl.handle.net/11536/14015
ISSN: 0021-8979
DOI: 10.1063/1.1834985
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 97
Issue: 3
結束頁: 
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