Investigation of carrier localization in bulk compound and quantum well GaAsSb/GaAs heterostructures

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Journal of Alloys and Compounds Pub Date : 2025-01-26 DOI:10.1016/j.jallcom.2025.178808

Ziyu Wang, Ying Wang, Hang Li, Yingnan Guo, Yuriy I. Mazur, Morgan E. Ware, Gregory J. Salamo, Michael E. Liao, Mark S. Goorsky, Baolai Liang

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Abstract

GaAsSb is a useful ternary semiconductor compound alloy and heterostructures made of GaSb_xAs_1-x facilitate versatile opto-electronic device applications. Thus, it is of significant importance to study carrier dynamics in GaAsSb and GaAsSb-containing heterostructures. This work investigated carrier localization mechanisms in GaAsSb and their influence on luminescence in both a single quantum well (QW) of 10 nm GaSb_0.1As_0.9 sandwiched between GaAs and a 250 nm bulk-like GaSb_0.1As_0.9 film on GaAs. Photoluminescence measurements reveal that for both samples the emission is impacted by exciton localization, however this is associated with different mechanisms in each sample. In the bulk film excitons become localized around Sb-composition fluctuations, while in the QW they localize along interface imperfections. Further spectral characterization demonstrates that both localized exciton (LE) and free exciton (FE) emission are indirect transitions in the QW. However, in bulk GaAsSb FE emission is direct, while LE emission is indirect. Therefore, the luminescence characteristics reflect different carrier dynamics that are correlated to the nature of the sample, i.e., depending on whether it is a QW or the bulk material.

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体化合物和量子阱GaAsSb/GaAs异质结构中载流子局域化的研究

GaAsSb是一种有用的三元半导体化合物合金，由GaSbxAs1-x制成的异质结构有助于多种光电器件的应用。因此，研究GaAsSb和含GaAsSb异质结构中的载流子动力学具有重要意义。本研究研究了GaAsSb中的载流子定位机制及其对夹在GaAs之间的10 nm的GaSb0.1As0.9单量子阱（QW）和GaAs上250 nm的片状GaSb0.1As0.9薄膜中发光的影响。光致发光测量表明，两种样品的发射都受到激子定位的影响，然而这与每个样品中的不同机制有关。在体膜中，激子在sb成分波动附近定位，而在量子阱中，激子沿着界面缺陷定位。进一步的光谱表征表明局域激子（LE）和自由激子（FE）发射都是QW中的间接跃迁。然而，在大块GaAsSb中，FE是直接发射，而LE是间接发射。因此，发光特性反映了不同的载流子动力学，这与样品的性质有关，即取决于它是QW还是块状材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.