Surface optical phonon propagation in defect modulated nanowires

Planar defects, such as stacking faults and twins, are the most common defects in III–V semiconductor nanowires. Here we report on the effect of surface perturbation caused by twin planes on surface optical (SO) phonon modes. Self-catalyzed GaAs nanowires with varying planar defect density were grow...

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Bibliographic Details
Published in:Journal of applied physics 2017-02, Vol.121 (8)
Main Authors: Venkatesan, Sriram, Mancabelli, Tobia, Krogstrup, Peter, Hartschuh, Achim, Dehm, Gerhard, Scheu, Christina
Format: Article
Language:English
Subjects:
Applied physics
Defects
Epitaxial growth
Molecular beam epitaxy
Nanowires
Raman spectroscopy
Stacking faults
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Summary:Planar defects, such as stacking faults and twins, are the most common defects in III–V semiconductor nanowires. Here we report on the effect of surface perturbation caused by twin planes on surface optical (SO) phonon modes. Self-catalyzed GaAs nanowires with varying planar defect density were grown by molecular beam epitaxy and investigated by Raman spectroscopy and transmission electron microscopy (TEM). SO phonon peaks have been detected, and the corresponding spatial period along the nanowire axis were measured to be 1.47 μm (±0.47 μm) and 446 nm (±35 nm) for wires with twin densities of about 0.6 (±0.2) and 2.2 (±0.18) per micron. For the wires with extremely high density of twins, no SO phonon peaks were detected. TEM analysis of the wires reveal that the average distance between the defects are in good agreement with the SO phonon spatial period determined by Raman spectroscopy.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4976564