Journal
APPLIED SURFACE SCIENCE
Volume 424, Issue -, Pages 412-420Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2016.11.178
Keywords
ZnO thin films; Sol-gel spin coating; Defect emission; Annealing
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Funding
- South African Research Chairs Initiative of the Department of Science and Technology
- National Research Foundation of South Africa [84415]
- African Laser Centre (ALC)
- therental pool progamme of the National Laser Centre (NLC)
- RSA and Romania
- ROSA [STAR 65, IDEI 52]
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ZnO thin films were successfully synthesized by the sol-gel method using the spin coater technique. The films were annealed at 600 degrees C in air for two hours and in Ar/H-2(5%) flow for 30 and 60 min, respectively. Structural analysis, surface morphology and characterization, as well as optical analysis (photoluminescence and cathodeluminescence (CL)) were done on the samples and discussed in detail. CL degradation during prolonged electron irradiation on the films was also determined. A preferential orientation of the c-axis perpendicular to the surface was observed from X-ray diffraction data showing the peak from the (002) plane for the films annealed in both the air and in the H-2 flow. The film annealed in air exhibited a broad visible emission as well as a strong ultraviolet emission. A single-green emission peak around 511 nm was obtained from the film that was annealed in Ar/H-2 flow for 60 min. The CL study revealed that the intensity of the green emission (511 nm) was very stable during electron bombardment for electron doses of more than 160 C/cm(2). (C) 2016 Elsevier B.V. All rights reserved.
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