Optical constants of Na-doped ZnO thin films by sol-gel method |
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| Authors: | Jianguo Lv Kai Huang Jianbo Zhu Xueping Song |
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| Institution: | a School of Physics and Material Science, Anhui University, Hefei 230039, Chinab Department of Physics and Electronic Engineering, Hefei Normal University, Hefei 230061, Chinac Department of Mathematics & Physics, Anhui University of Architecture, Hefei 230601, Chinad School of Sciences, Anhui Agricultural University, Hefei 230036, China |
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| Abstract: | The structural and optical properties of pure and Na-doped ZnO thin films have been investigated by X-ray diffraction (XRD), atom force microscopy and UV-Vis spectrophotometer. The crystal structure of all the thin films is the hexagonal wurtzite. The average grain size and surface roughness increases with the increase of the Na/Zn ratio. The optical band gap of the thin films decreases from 3.26 to 3.12 eV by increasing the Na/Zn ratio from 0.0 to 0.10. Transmittance spectra were used to determine the optical constants of the thin films, and the effect of Na/Zn ratio on the optical constants was investigated. With the increase of Na/Zn ratio, the refractive index decreases and the extinction coefficient increases in the 380-700 nm spectral range. |
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| Keywords: | Na doping ZnO thin films Roughness Transmittance spectrum Optical constants |
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