Title :
Large-scale fabrication and the optical properties of tower-like zinc oxide structures
Author :
Siwen Zhang ; Bosi Yin ; Yang Jiao ; Yang Liu ; Fengyu Qu ; Xiang Wu
Author_Institution :
Key Lab. for Photonic & Electron. Bandgap Mater., Harbin Normal Univ., Harbin, China
Abstract :
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.
Keywords :
II-VI semiconductors; X-ray diffraction; catalysts; crystal microstructure; deep levels; evaporation; nanofabrication; nanostructured materials; photoluminescence; scanning electron microscopy; semiconductor growth; wide band gap semiconductors; zinc compounds; Si; X-ray diffraction; ZnO; ZnO nanotower preparation; catalysts; deep-level defects; green emission; large scale fabrication; microstructures; morphological property; optical properties; photoluminescence spectrum; scanning electron microscopy; silicon substrate; temperature 293 K to 298 K; temperature 950 degC; thermal evaporation method; tower-like zinc oxide structure; ultraviolet emission peak; wavelength 380 nm; wavelength 540 nm;
Journal_Title :
Micro & Nano Letters, IET
DOI :
10.1049/mnl.2014.0081