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Study of InAs quantum dots in GaAs prepared on misoriented substrates

机译:在取向错误的衬底上制备的GaAs中InAs量子点的研究

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Optical properties of quasi zero-dimensional semiconductor quantum dots were studied by photoluminescence and Raman spectroscopy. The dependence of photoluminescence on substrate orientation and Raman spectra of single and multiple InAs/GaAs quantum dot structures are reported. The samples were grown on (100) oriented GaAs substrates without and with 3 deg misorientation towards (110) by metal-organic vapor phase epitaxy in the Stranski-Krastanow regime. Strong dependence of photoluminescence properties of the quantum dot structures on substrate misorientation is shown. The InAs-related features are observed in the macro-Raman spectra and micro-Raman spectra. The effects of confinement, alloying and strain on PL and on phonon spectra are discussed.
机译:通过光致发光和拉曼光谱研究了准零维半导体量子点的光学性质。报道了光致发光对单个和多个InAs / GaAs量子点结构的衬底取向和拉曼光谱的依赖性。在Stranski-Krastanow体制下,通过金属-有机气相外延,使样品在(100)取向的GaAs衬底上生长,并且没有朝向和向(110)倾斜3度的情况。显示了量子点结构的光致发光性质对衬底取向错误的强烈依赖性。在宏观拉曼光谱和微观拉曼光谱中观察到InAs相关特征。讨论了约束,合金化和应变对PL和声子谱的影响。

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