Scale-Dependent Growth Modes of Selective Area Grown III-V Nanowires.

IF 11.3 1区化学 Q1 CHEMISTRY, PHYSICAL ACS Catalysis Pub Date : 2024-11-13 Epub Date: 2024-11-01 DOI:10.1021/acs.nanolett.4c03283

Daria V Beznasyuk, Sara Martí-Sánchez, Gunjan Nagda, Damon James Carrad, Jordi Arbiol, Thomas Sand Jespersen

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Abstract

Due to their flexible geometry, in-plane selective area grown (SAG) nanowires (NWs) encompass the advantages of vapor-liquid-solid NWs and planar structures. The complex interplay of growth kinetics and NW dimensions provides new pathways for crystal engineering; however, their growth mechanisms remain poorly understood. We analyze the growth mechanisms of GaAs(Sb) and InGaAs/GaAs(Sb) in-plane SAG NWs using molecular beam epitaxy (MBE). While GaAs(Sb) NWs consistently follow a layer-by-layer growth, the InGaAs/GaAs(Sb) growth transitions from step-flow to layer-by-layer and layer-plus-island depending on the InGaAs thickness and the NW dimensions. We extract the diffusion lengths of Ga adatoms along the [11̅0] and [110] directions under As₂ during GaAs(Sb) growth. Our results indicate that Sb may inhibit the layer-by-layer to step-flow transition. Our findings show that different growth modes can be achieved in the MBE of in-plane SAG NWs grown on the same substrate and highlight the importance of the interplay with NW dimensions.

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选择性面积生长的 III-V 纳米线的规模依赖性生长模式。

面内选择性面积生长（SAG）纳米线（NWs）具有灵活的几何形状，兼具气-液-固纳米线和平面结构的优点。生长动力学和纳米线尺寸的复杂相互作用为晶体工程提供了新的途径；然而，人们对它们的生长机制仍然知之甚少。我们利用分子束外延 (MBE) 技术分析了砷化镓（锑）和砷化镓/砷化镓（锑）平面内 SAG 纳米线的生长机制。GaAs(Sb) NW 始终遵循逐层生长，而 InGaAs/GaAs(Sb)则根据 InGaAs 厚度和 NW 尺寸的不同，从阶梯流动生长过渡到逐层生长和层加岛生长。我们提取了砷化镓（Sb）生长过程中砷在 As2 下沿 [11̅0] 和 [110] 方向的扩散长度。我们的结果表明，Sb 可能会抑制逐层向阶跃流动的转变。我们的研究结果表明，在同一基底上生长的面内 SAG NW 的 MBE 可以实现不同的生长模式，并强调了与 NW 尺寸相互作用的重要性。

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

ACS Catalysis CHEMISTRY, PHYSICAL-

CiteScore

20.80

自引率

6.20%

发文量

1253

审稿时长

1.5 months

期刊介绍： ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels. The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.