Journal
APPLIED SURFACE SCIENCE
Volume 283, Issue -, Pages 781-787Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2013.07.018
Keywords
Nanocrystalline ZnO films; Pulse laser deposition; Raman spectrum; Optical properties
Categories
Funding
- Foundation of National Key Basic Research and Development Program [2010CB631001]
- Program for Changjiang Scholars and Innovative Research Team in University
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Nanocrystalline ZnO films were fabricated by pulse laser deposition. As the film's grain size decreases to small nanosize (20 nm), the film exhibits unique optical properties. The photoluminescence spectrum has three broad emissions located across ultraviolet-violet, yellow-green-orange and red regions. The structures were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The results indicate that the nanocrystalline ZnO film with small nanosize has degenerated crystalline quality and various structured defects. These abnormal optical properties were attributed to the abundant structural defects and the quantum confinement effect of the nanocrystalline ZnO films. (C) 2013 Elsevier B.V. All rights reserved.
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