Structural and optical properties of individual GaP/ZnO core–shell nanowires

Novák, J.; Šutta, P.; Kováč, J.; Laurenčíková, A.; Eliáš, P.; Mikulics, Martin; Križanová, Z.; Vávra, I.; Hasenöhrl, S.; Novotný, I.

doi:10.1016/j.vacuum.2012.12.005

Journal Article

FZJ-2014-00593

Structural and optical properties of individual GaP/ZnO core–shell nanowires

Novák, J. (Corresponding author) ; Križanová, Z. ; Vávra, I. ; Eliáš, P. ; Hasenöhrl, S. ; Laurenčíková, A. ; Novotný, I. ; Kováč, J. ; Šutta, P. ; Mikulics, M.FZJ*

2013
Elsevier Science Amsterdam [u.a.]

Vacuum 98, 106 - 110 (2013) [10.1016/j.vacuum.2012.12.005]

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Please use a persistent id in citations: doi:10.1016/j.vacuum.2012.12.005

Abstract: Structural and optical properties of ZnOeGaP coreeshell nanowires were studied by means of electron microscopy and microphotoluminescence. A thin ZnO shell layer was deposited by RF sputtering on GaP nanowires, which were grown on GaP (111)B substrates under vapoureliquidesolid mode by MOVPE. The SEM and TEM characterization showed that the ZnO shells fully covered the surface of the NWs from top to bottom. Each GaP NW core is composed of many well-defined twinned segments with the planes of twinning oriented in perpendicular to the growth direction. This was contradicted in kinked GaP NWs: their growth direction was initially perpendicular to the twinning planes, but once the NW had kinked, it changed to lie within the twinning planes. The ZnO shell deposited on the GaP core has a columnar morphology. The columns are inclined at a positive angle close to 70 with respect to the GaP growth axis. All observed columns were tilted at this angle to the growth direction. Micro-photoluminescence study showed that thermal annealing improved the quality of the ZnO crystallographic structure; the annealing made observable the photoluminescence peak related to the band-to-band transition in ZnO.

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