Self-Catalyzed AlGaAs Nanowires and AlGaAs/GaAs Nanowire-Quantum Dots on Si Substrates.
Self-Catalyzed AlGaAs Nanowires and AlGaAs/GaAs Nanowire-Quantum Dots on Si Substrates.
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DOI：
10.1021/acs.jpcc.1c03680
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发表时间：
2021-07-08
期刊：
影响因子：
--
通讯作者：
Liu H
中科院分区：
文献类型：
--
作者：
Boras G;Yu X;Fonseka HA;Davis G;Velichko AV;Gott JA;Zeng H;Wu S;Parkinson P;Xu X;Mowbray D;Sanchez AM;Liu H
采用固体源分子束外延技术在Si（111）衬底上生长了自催化AlGaAs纳米线和GaAs量子点纳米线。与先前采用的Au催化方法相比，这种生长技术是有利的，因为它消除了Au污染问题，并使结构与互补金属氧化物半导体（CMOS）技术应用兼容。结构研究揭示了自形成的富铝AlGaAs壳，厚在NW基地和变薄的尖端，与观察到的NW核心的相反的行为。还注意到壳区的宽合金波动。标称Al含量为10%、20%和30%的AlGaAs NW结构具有强的室温光致发光，发射在1.50-1.72 eV的范围内。嵌入4.9 nm厚GaAs区域的单个纳米线表现出清晰的量子点行为，具有空间局域发射、激子和双激子复合线，以及低温下490 μeV的激子线宽。我们的研究结果首次展示了通过自催化方法生长的AlGaAs纳米线和AlGaAs/GaAs纳米量子点的性质和行为，并展示了它们在纳米激光器和单光子源等一系列新应用中的潜力。
Self-catalyzed AlGaAs nanowires (NWs) and NWs with a GaAs quantum dot (QD) were monolithically grown on Si(111) substrates via solid-source molecular beam epitaxy. This growth technique is advantageous in comparison to the previously employed Au-catalyzed approach, as it removes Au contamination issues and renders the structures compatible with complementary metal–oxide–semiconductor (CMOS) technology applications. Structural studies reveal the self-formation of an Al-rich AlGaAs shell, thicker at the NW base and thinning towards the tip, with the opposite behavior observed for the NW core. Wide alloy fluctuations in the shell region are also noticed. AlGaAs NW structures with nominal Al contents of 10, 20, and 30% have strong room temperature photoluminescence, with emission in the range of 1.50–1.72 eV. Individual NWs with an embedded 4.9 nm-thick GaAs region exhibit clear QD behavior, with spatially localized emission, both exciton and biexciton recombination lines, and an exciton line width of 490 μeV at low temperature. Our results demonstrate the properties and behavior of the AlGaAs NWs and AlGaAs/GaAs NWQDs grown via the self-catalyzed approach for the first time and exhibit their potential for a range of novel applications, including nanolasers and single-photon sources.
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