Catalyst-free ZnO nanowires grown on a-plane GaN

ZnO nanowires were grown on a-plane GaN templates by chemical vapor deposition (CVD) without employing a catalyst. The a-plane GaN templates were pre-deposited on an r-plane sapphire substrate by metal-organic CVD. The resulting ZnO nanowires grow in angles off- related to the GaN basal plane. X-ray...

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Veröffentlicht in:Vacuum 2010-02, Vol.84 (6), p.803-806
Hauptverfasser: Chen, C.W., Pan, C.J., Tsao, F.C., Liu, Y.L., Kuo, C.W., Kuo, C.H., Chi, G.C., Chen, P.H., Lai, W.C., Hsueh, T.H., Tun, C.J., Chang, C.Y., Pearton, S.J., Ren, F.
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container_end_page 806
container_issue 6
container_start_page 803
container_title Vacuum
container_volume 84
creator Chen, C.W.
Pan, C.J.
Tsao, F.C.
Liu, Y.L.
Kuo, C.W.
Kuo, C.H.
Chi, G.C.
Chen, P.H.
Lai, W.C.
Hsueh, T.H.
Tun, C.J.
Chang, C.Y.
Pearton, S.J.
Ren, F.
description ZnO nanowires were grown on a-plane GaN templates by chemical vapor deposition (CVD) without employing a catalyst. The a-plane GaN templates were pre-deposited on an r-plane sapphire substrate by metal-organic CVD. The resulting ZnO nanowires grow in angles off- related to the GaN basal plane. X-ray diffraction (XRD) spectra showed that the ZnO layer was grown with a heteroepitaxial relationship of (110) ZnO||(110) GaN. Photoluminescence spectra measured at 17 K exhibited near-band-edge emission at 372 nm with a full width at half maximum of 10 nm. The growth mechanism on a-GaN was the Volmer-Weber (VW) mode and differed from the Stranski-Krastanow (SK) mode observed for growth on c-GaN. This difference results from the higher interfacial free-energy on the a-plane between ZnO and GaN than that on the c-plane orientation.
doi_str_mv 10.1016/j.vacuum.2009.10.043
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subjects Catalysts
Chemical vapor deposition
Diffraction
Gallium nitrides
Nanowires
Spectra
X-rays
Zinc oxide
ZnO nanowires
title Catalyst-free ZnO nanowires grown on a-plane GaN
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