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X-ray scattering study of GaN nanowires grown on Ti/AlO by molecular beam epitaxy. | LitMetric
GaN nanowires (NWs) grown by molecular beam epitaxy on Ti films sputtered on AlO are studied by X-ray diffraction (XRD) and grazing-incidence small-angle X-ray scattering (GISAXS). XRD, performed both in symmetric Bragg reflection mode and at grazing incidence, reveals Ti, TiN, TiO, TiAl and GaO crystallites with in-plane and out-of-plane lattice parameters intermediate between those of AlO and GaN. These topotaxial crystallites in the Ti film, formed as a result of interfacial reactions and N exposure, possess little misorientation with respect to AlO. As a result, GaN NWs grow on the top TiN layer, possessing a high degree of epitaxial orientation with respect to the substrate. The measured GISAXS intensity distributions are modelled by the Monte Carlo method, taking into account the orientational distributions of NWs, the variety of their cross-sectional shapes and sizes, and the roughness of their side facets. The cross-sectional size distributions of the NWs and the relative fractions of the {1100} and {1120} side facets are determined.
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