4.6 Article

Investigation of nitrogen doped ZnO thin films: Effects on their structural and optical properties

期刊

OPTICAL MATERIALS
卷 122, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.optmat.2021.111685

关键词

N doped ZnO; Magnetron sputtering; Spectroscopic Ellipsometer; XRD; Energy band gap

向作者/读者索取更多资源

The growth of undoped and nitrogen-doped ZnO thin films using RF magnetron sputtering was studied. The structural, morphological, and optical properties of the films were analyzed, with XRD confirming the hexagonal crystal structure of the nitrogen-doped ZnO films. The transmittance, optical band gap, and refractive index of the films were influenced by the nitrogen doping concentration and thickness dependence.
Un-doped and nitrogen-doped ZnO thin films were grown by using radio frequency (RF) magnetron sputtering method changing the nitrogen flow rate between 0% -12.5% and the thickness dependence of films was determined. The effect of nitrogen doping concentration on the structural, morphological, and optical properties of zinc oxide thin films was studied. X-ray diffraction (XRD) analysis confirmed that the nitrogen-doped ZnO films belong to the hexagonal crystal structure. The optical properties of the grown samples were examined by optical spectrophotometer and spectroscopic ellipsometer. Transmittance spectra were obtained by spectrophotometer measurements and the effect of nitrogen ratio was investigated. It has been observed that as the nitrogen ratio increases, the transmittance decreases up to -500 nm and then increases. By using the transmittance curve, the energy band gap was calculated. Further detailed optical analysis was made by the spectroscopic ellipsometry technique. Fitting was performed to ensure the agreement between the experimentally obtained psi values and theoretically determined psi values using the Cauchy model. As a result, the refractive index was found for each film and it was observed that the refractive index decreased as the nitrogen ratio increased. The scanning electron microscopy (SEM) measurements showed that the surface morphology of the films changes with N doping. Nitrogen was observed in Fourier transform infrared spectra analysis. 5% nitrogendoped ZnO films were grown on the glass substrate using RF magnetron sputtering at room temperature. Samples are prepared by varying thicknesses during the deposition process. XRD and SEM measurements of the samples show the variation in the crystal structure and surface morphology of the film with varying thicknesses. All the samples are tested for the transmittance and band gap. The increase of film thickness increases the grain size. The transmittance is influenced by the film thickness.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据