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首页> 外文期刊>Journal of Crystal Growth >Facilitating growth of InAs-InP core-shell nanowires through the introduction of Al
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Facilitating growth of InAs-InP core-shell nanowires through the introduction of Al

机译:通过引入Al促进InAs-InP核壳纳米线的生长

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InAs nanowires were grown on GaAs substrates by the Au-assisted vapour-liquid-solid (VLS) method in a gas source molecular beam epitaxy (GSMBE) system. Passivation of the InAs nanowires using InP shells proved difficult due to the tendency for the formation of axial rather than core-shell structures. To circumvent this issue, Al_xIn_(1-x)As or Al_xIn_(1-x)P shells with nominal Al composition fraction of x=0.20, 0.36, or 0.53 were grown by direct vapour-solid deposition on the sidewalls of the InAs nanowires. Characterisation by transmission electron microscopy revealed that the addition of Al in the shell resulted in a remarkable transition from the VLS to the vapour-solid growth mode with uniform shell thickness along the nanowire length. Possible mechanisms for this transition include reduced adatom diffusion, a phase change of the Au seed particle, and surfactant effects. The InAs-AlInP core shell nanowires exhibited misfit dislocations, while the InAs-AlInAs nanowires with lower strain appeared to be free of dislocations.
机译:在气源分子束外延(GSMBE)系统中,通过金辅助汽-液-固(VLS)方法在GaAs衬底上生长了InAs纳米线。由于形成轴向而不是核-壳结构的趋势,使用InP壳对InAs纳米线进行钝化被证明是困难的。为了解决这个问题,通过直接蒸气固相沉积在InAs纳米线的侧壁上,生长了标称Al组成分数为x = 0.20、0.36或0.53的Al_xIn_(1-x)As或Al_xIn_(1-x)P壳。透射电子显微镜表征表明,在壳中添加Al导致了从VLS到气态固体生长模式的显着转变,且沿着纳米线的长度壳厚度均匀。该转变的可能机制包括减少的原子扩散,金种子颗粒的相变和表面活性剂效应。 InAs-AlInP核壳纳米线表现出失配位错,而应变较低的InAs-AlInAs纳米线似乎没有位错。

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