Radial Growth of Self-Catalyzed GaAs Nanowires and the Evolution of the Liquid Ga-Droplet Studied by Time-Resolved in Situ X‑ray Diffraction

We report on a growth study of self-catalyzed GaAs nanowires based on time-resolved in situ X-ray structure characterization during molecular-beam-epitaxy in combination with ex situ scanning-electron-microscopy. We reveal the evolution of nanowire radius and polytypism and distinguish radial growth...

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Bibliographic Details
Published in:Nano letters 2018-01, Vol.18 (1), p.101-108
Main Authors: Schroth, Philipp, Jakob, Julian, Feigl, Ludwig, Mostafavi Kashani, Seyed Mohammad, Vogel, Jonas, Strempfer, Jörg, Keller, Thomas F, Pietsch, Ullrich, Baumbach, Tilo
Format: Article
Language:English
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Summary:We report on a growth study of self-catalyzed GaAs nanowires based on time-resolved in situ X-ray structure characterization during molecular-beam-epitaxy in combination with ex situ scanning-electron-microscopy. We reveal the evolution of nanowire radius and polytypism and distinguish radial growth processes responsible for tapering and side-wall growth. We interpret our results using a model for diameter self-stabilization processes during growth of self-catalyzed GaAs nanowires including the shape of the liquid Ga-droplet and its evolution during growth.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.7b03486