Self-Catalyzed Growth of Vertical GaSb Nanowires on InAs Stems by Metal-Organic Chemical Vapor DepositionReportar como inadecuado




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Nanoscale Research Letters

, 12:428

First Online: 26 June 2017Received: 10 May 2017Accepted: 20 June 2017

Abstract

We report the first self-catalyzed growth of high-quality GaSb nanowires on InAs stems using metal-organic chemical vapor deposition MOCVD on Si 111 substrates. To achieve the growth of vertical InAs-GaSb heterostructure nanowires, the two-step flow rates of the trimethylgallium TMGa and trimethylantimony TMSb are used. We first use relatively low TMGa and TMSb flow rates to preserve the Ga droplets on the thin InAs stems. Then, the flow rates of TMGa and TMSb are increased to enhance the axial growth rate. Because of the slower radial growth rate of GaSb at higher growth temperature, GaSb nanowires grown at 500 °C exhibit larger diameters than those grown at 520 °C. However, with respect to the axial growth, due to the Gibbs-Thomson effect and the reduction in the droplet supersaturation with increasing growth temperature, GaSb nanowires grown at 500 °C are longer than those grown at 520 °C. Detailed transmission electron microscopy TEM analyses reveal that the GaSb nanowires have a perfect zinc-blende ZB crystal structure. The growth method presented here may be suitable for other antimonide nanowire growth, and the axial InAs-GaSb heterostructure nanowires may have strong potential for use in the fabrication of novel nanowire-based devices and in the study of fundamental quantum physics.

KeywordsHeterostructure nanowire InAs-GaSb Self-catalyzed Crystal structure Metal-organic chemical vapor deposition AbbreviationsCMOSComplementary metal-oxide-semiconductor

EDSEnergy dispersive spectroscopy

FFTFast Fourier transform

LOLongitudinal optical

MBEMolecular beam epitaxy

MOCVDMetal-organic chemical vapor deposition

SEMScanning electron microscopy

SFStacking fault

TEMTransmission electron microscopy

TMGaTrimethylgallium

TMSbTrimethylantimony

TOTransversal optical

TPTwin plane

VLSVapor-liquid-solid

ZBZinc-blende

Electronic supplementary materialThe online version of this article doi:10.1186-s11671-017-2207-5 contains supplementary material, which is available to authorized users.

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Autor: Xianghai Ji - Xiaoguang Yang - Tao Yang

Fuente: https://link.springer.com/







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