Influence of dopant content on morphology and optical constants of ZnO: Na films by sol-gel method |
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Authors: | L Jian-guo CAO Chun-bin SONG Xue-ping SUN Zhao-qi |
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Affiliation: | (1) Faculty of Science, Department of Physics, Anadolu University, 26470 Eskisehir, Turkey;(2) Faculty of Arts and Sciences, Department of Physics, Firat University, 23169 Elazig, Turkey |
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Abstract: | Undoped and Na-doped ZnO films were deposited by sol-gel method. The effects of sodium incorporation on structure, surface
morphology and optical constants of the films were investigated. X-ray diffraction patterns show the hexagonal wurtzite polycrystalline
structure and that the sodium incorporation leads to the change in the structural characteristics of ZnO films. The SEM observations
show that the surface morphology of the films is affected by the sodium incorporation. The transmission spectra show that
the average transmittance of the films is above 85% in the visible range. The absorption edge initially blue-shifts and then
red-shifts with the increase of Na doping content. The optical constants of these films were calculated using transmission
spectra. Refractive indices of the films in the visible range decrease at first and then increase with increasing Na doping
content. |
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Keywords: | Na-doped ZnO sol-gel method transmission spectra optical constants |
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