Influence of annealing temperature on optical properties of zinc oxide thin films analyzed by spectroscopic ellipsometry method |
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| Institution: | 1. Department of Physics, Jiaozuo Teachers College, Jiaozuo 454001, China;2. Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, China;1. Nanotechnology Application Centre, University of Allahabad, Allahabad 211002, India;2. Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India;3. Central University of Haryana, Jant-Pali, Mahendergarh 123029, India;1. Department of Electrical and Electronics Engineering, Atilim University, 06836, Ankara, Turkey;2. Department of Physics, Middle East Technical University, 06800, Ankara, Turkey;3. Virtual International Scientific Research Centre, Baku State University, 1148, Baku, Azerbaijan;1. Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;2. Materials Chemistry Research Center, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;1. Korea Institute of Carbon Convergence Technology, Jeonju 561-844, Republic of Korea;2. Department of Chemistry, Waterloo Institute for Nanotechnology and Institute for Polymer Research, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;3. Department of Chemical Engineering and Materials Science, Sangmyung University, Seoul 110-743, Republic of Korea |
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| Abstract: | Zinc oxide (ZnO) thin films were sol–gel spin coated on glass substrates, annealed at various temperatures 300 °C, 400 °C and 500 °C and characterized by spectroscopic ellipsometry method. The optical properties of the films such as transmittance, refractive index, extinction coefficient, dielectric constant and optical band gap energy were determined from ellipsometric data recorded over the spectral range of 300–800 nm. The effect of annealing temperature in air on optical properties of the sol–gel derived ZnO thin films was studied. The transmission values of the annealed films were about 65% within the visible range. The optical band gap of the ZnO thin films were measured between 3.25 eV and 3.45 eV. Also the dispersion parameters such as single oscillator energy and dispersive energy were determined from the transmittance graph using the Wemple and DiDomenico model. |
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