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首页> 外文期刊>Optical and quantum electronics >Temperature-dependent modulated reflectance and photoluminescence of InAs-GaAs and InAs-InGaAs-GaAs quantum dot heterostructures
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Temperature-dependent modulated reflectance and photoluminescence of InAs-GaAs and InAs-InGaAs-GaAs quantum dot heterostructures

机译:InAs-GaAs和InAs-InGaAs-GaAs量子点异质结构的温度相关调制反射率和光致发光

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摘要

Optical transitions and electronic properties of epitaxial InAs quantum dots (QDs) grown with and without InGaAs strain-relieving capping layer within GaAs/AlAs quantum well (QW) are investigated. Modulated reflectance and photoluminescence spectroscopy is used to probe the QD- and QW-related interband optical transitions over the temperature range of 3-300 K. The observed spectral features in QDs are identified using numerical calculations in a framework of 8-band k · p method. It is found that covering the dots by a 5 nm-thick InGaAs layer yields the energy red-shift of ground-state transition by ~ 150 meV. Moreover, the analysis of interband transition energy dependence on temperature using Varshni expression shows that material composition of InAs QDs significantly changes due to Ga/In interdiffusion. A comparison of emission- and absorption-type spectroscopy applied for InAs-GaAs QDs indicates a Stokes shift of ~ 0.02 meV above 150 K temperature.
机译:研究了在GaAs / AlAs量子阱(QW)中有和没有InGaAs应变消除覆盖层的情况下生长的外延InAs量子点(QD)的光学跃迁和电子性质。调制反射率和光致发光光谱用于探测3-300 K温度范围内与QD和QW相关的带间光学跃迁。在8波段k·p框架内使用数值计算来识别QD中观察到的光谱特征方法。发现用5 nm厚的InGaAs层覆盖点会产生基态跃迁的能量红移约150 meV。此外,使用Varshni表达式分析带间跃迁能量对温度的依赖性表明,由于Ga / In互扩散,InAs量子点的材料组成发生了显着变化。应用于InAs-GaAs量子点的发射型和吸收型光谱的比较表明,在150 K温度以上,斯托克斯位移为0.02 meV。

著录项

  • 来源
    《Optical and quantum electronics》 |2016年第3期|202.1-202.6|共6页
  • 作者单位

    Semiconductor Physics Institute of Center for Physical Sciences and Technology, A. Gostauto 11, 01108 Vilnius, Lithuania;

    Semiconductor Physics Institute of Center for Physical Sciences and Technology, A. Gostauto 11, 01108 Vilnius, Lithuania;

    Semiconductor Physics Institute of Center for Physical Sciences and Technology, A. Gostauto 11, 01108 Vilnius, Lithuania;

    Semiconductor Physics Institute of Center for Physical Sciences and Technology, A. Gostauto 11, 01108 Vilnius, Lithuania;

    Semiconductor Physics Institute of Center for Physical Sciences and Technology, A. Gostauto 11, 01108 Vilnius, Lithuania;

    Semiconductor Physics Institute of Center for Physical Sciences and Technology, A. Gostauto 11, 01108 Vilnius, Lithuania;

    School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK;

    School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    InAs quantum dots; Modulated reflectance; Photoluminescence; Optical transitions; Electronic structure;

    机译:InAs量子点;调制反射率;光致发光;光学跃迁;电子结构;

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