An investigation on linear optical properties of dilute Cr doped ZnO thin films synthesized via sol-gel process |
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Authors: | A. Esmaielzadeh Kandjani M. Farzalipour TabrizO. Mohammad Moradi H.R. Rezaeian MehrS. Ahmadi Kandjani M.R. Vaezi |
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Affiliation: | a Division of Nanotechnology and Advanced Materials, Materials and Energy Research Centre (MERC), Karaj, Iran b Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran |
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Abstract: | Cr doped ZnO thin films were prepared via sol-gel method. The effects of dopant concentration (0%, 1.5% and 3%) annealing temperature and film thickness on UV-Vis spectra of prepared films were investigated. Also, the thickness and surface topology of thin films were investigated by thickness profile meter (DEKTAK) and Atomic Force Microscopy (AFM), respectively. In addition, the band gap and Urbach energy of prepared films were calculated completely for the samples. The results showed that by increasing the dopant concentrations, the microstrain of the prepared thin film structures also increases while the band-gap values decrease. Meanwhile, an increase in annealing temperature makes a decrease in band gap and microstrain of thin films. The increase in thickness resulted in red shift in band gap and reduction in interior microstrains. |
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Keywords: | Semiconductors Thin films Sol-gel processes Optical properties Light absorption and Reflection |
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