The effect of heat treatment on the physical properties of sol-gel derived ZnO thin films Article
Author(s): Raoufi D., Raoufi T.
Applied Surface Science Volume 255, Issue 11, 2009 , Pages 5812-5817
DOI:10.1016/j.apsusc.2009.01.010
(IF=5.155 ,Q1,JCR2018) (CiteScore=4.93 ,Q1,Scopus2018)
Abstract:
Zinc oxide (ZnO) thin films were deposited on microscope glass substrates by sol-gel spin coating method. Zinc acetate (ZnAc) dehydrate was used as the starting salt material source. A homogeneous and stable solution was prepared by dissolving ZnAc in the solution of monoethanolamine (MEA). ZnO thin films were obtained after preheating the spin coated thin films at 250 °C for 5 min after each coating. The films, after the deposition of the eighth layer, were annealed in air at temperatures of 300 °C, 400 °C and 500 °C for 1 h. The effect of thermal annealing in air on the physical properties of the sol-gel derived ZnO thin films are studied. The powder and its thin film were characterized by X-ray diffractometer (XRD) method. XRD analysis revealed that the annealed ZnO thin films consist of single phase ZnO with wurtzite structure (JCPDS 36-1451) and show the c-axis grain orientation. Increasing annealing temperature increased the c-axis orientation and the crystallite size of the film. The annealed films are highly transparent with average transmission exceeding 80% in the visible range (400-700 nm). The measured optical band gap values of the ZnO thin films were between 3.26 eV and 3.28 eV, which were in the range of band gap values of intrinsic ZnO (3.2-3.3 eV). SEM analysis of annealed thin films has shown a completely different surface morphology behavior. © 2009 Elsevier B.V. All rights reserved.
Keywords:
Sol-gel Structural and optical properties Thin film ZnO
Index Keywords:
Annealing Binary alloys Crystallite size Deposition Energy gap Ethanolamines II-VI semiconductors Metallic films Optical properties Oxide films Sol-gel process Sol-gels Spin glass Substrates Thin films Zinc coatings Zinc oxide Zinc sulfide Annealing temperatures C-axis orientations Different surface morphologies Effect of heat treatments Sol-gel spin coating method Spin-coated thin films Structural and optical properties X ray diffractometers Optical films

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