access icon free Large-scale fabrication and the optical properties of tower-like zinc oxide structures

Large-scale uniform ZnO nanotowers on silicon substrate have been prepared by the thermal evaporation method at 950°C using Au as the catalyst. The morphology and microstructure of the as-synthesised ZnO nanotowers were characterised by scanning electron microscopy and X-ray diffraction. The room temperature photoluminescence spectrum of the as-synthesised ZnO nanotowers shows a strong ultraviolet emission peak at 380 nm and a weak green emission at 540 nm, revealing that there are a few deep-level defects in the single ZnO structure. The growth mechanism of the as-synthesised ZnO structures is also discussed.

Inspec keywords: semiconductor growth; deep levels; nanofabrication; photoluminescence; catalysts; zinc compounds; scanning electron microscopy; wide band gap semiconductors; II-VI semiconductors; crystal microstructure; X-ray diffraction; evaporation; nanostructured materials

Other keywords: scanning electron microscopy; large scale fabrication; ZnO; Si; green emission; ZnO nanotower preparation; deep-level defects; temperature 950 degC; wavelength 540 nm; microstructures; catalysts; X-ray diffraction; ultraviolet emission peak; morphological property; wavelength 380 nm; photoluminescence spectrum; tower-like zinc oxide structure; thermal evaporation method; silicon substrate; optical properties; temperature 293 K to 298 K

Subjects: Impurity and defect levels in II-VI and III-V semiconductors; II-VI and III-V semiconductors; Nanometre-scale semiconductor fabrication technology; Optical properties of II-VI and III-V semiconductors (thin films, low-dimensional and nanoscale structures); Luminescent materials; Heterogeneous catalysis at surfaces and other surface reactions; Surface treatment and degradation in semiconductor technology; Methods of nanofabrication and processing; Photoluminescence in II-VI and III-V semiconductors; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials

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