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首页> 外文期刊>Nanotechnology >Spontaneous core-shell elemental distribution in In-rich In_xGa_(1-x)N nanowires grown by molecular beam epitaxy
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Spontaneous core-shell elemental distribution in In-rich In_xGa_(1-x)N nanowires grown by molecular beam epitaxy

机译：分子束外延生长的In-InGaIn_xGa_（1-x）N纳米线的自发核壳元素分布

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摘要

The elemental distribution of self-organized In-rich In_xGa_(1-x)N nanowires grown by plasma-assisted molecular beam epitaxy has been investigated using three different techniques with spatial resolution on the nanoscale. Two-dimensional images and elemental profiles of single nanowires obtained by x-ray fluorescence and energy-dispersive x-ray spectroscopy, respectively, have revealed a radial gradient in the alloy composition of each individual nanowire. The spectral selectivity of resonant Raman scattering has been used to enhance the signal from very small volumes with different elemental composition within single nanowires. The combination of the three techniques has provided sufficient sensitivity and spatial resolution to prove the spontaneous formation of a core-shell nanowire and to quantify the thicknesses and alloy compositions of the core and shell regions. A theoretical model based on continuum elastic theory has been used to estimate the strain fields present in such inhomogeneous nanowires. These results suggest new strategies for achieving high quality non-polar heterostructures.
机译：使用三种不同的技术在纳米尺度上研究了通过等离子体辅助分子束外延生长的自组织的富In_xGa_（1-x）N纳米线的元素分布。分别通过X射线荧光和能量色散X射线光谱学获得的单根纳米线的二维图像和元素轮廓已经揭示了每条纳米线的合金成分中的径向梯度。共振拉曼散射的光谱选择性已用于增强来自单个纳米线内具有不同元素组成的非常小体积的信号。三种技术的结合提供了足够的灵敏度和空间分辨率，以证明核-壳纳米线的自发形成并量化核和壳区域的厚度和合金成分。基于连续弹性理论的理论模型已被用来估计这种不均匀纳米线中存在的应变场。这些结果提出了用于实现高质量非极性异质结构的新策略。

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