Nanostructured Fe:SnO2 thin films were deposited on glass substrates through sol–gel spin coating method. Films were synthesized with different iron quantities including 0%, 4%, 8% and 12% (wt.%). The effects of Fe concentration on optical properties of films were investigated by spectroscopic ellipsometry (SE) technique. SE measured ([Formula: see text]) parameters for films in the wavelength range between 300[Formula: see text]nm to 800[Formula: see text]nm. Optical properties including the refractive index, extinction coefficient, transmittance, dielectric constants and optical conductivity were determined by fitting the SE measured ([Formula: see text]) parameters and data obtained from the optical model-based analysis. Results showed that the transmittance values increase by increment of Fe concentration from 0% to 12%. The bandgap energy ([Formula: see text] of prepared thin films was also calculated. [Formula: see text] values were between 3.44 and 3.58[Formula: see text]eV. Dispersion parameters including the high frequency dielectric constant ([Formula: see text] and the ratio of free carrier concentration to effective mass (N/m[Formula: see text] were then obtained for the prepared films.

中文翻译：

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Fe:SNO2 薄膜光学特性的光谱椭偏仪研究：铁浓度的影响

纳米结构 Fe:SnO2通过溶胶-凝胶旋涂法将薄膜沉积在玻璃基板上。用不同的铁量合成薄膜，包括 0%、4%、8% 和 12% (wt.%)。采用光谱椭偏仪（SE）技术研究了Fe浓度对薄膜光学性能的影响。SE测量（[公式：见文本]）波长范围在300[公式：见文本]nm至800[公式：见文本]nm之间的薄膜参数。通过拟合从基于光学模型的分析中获得的 SE 测量（[公式：参见文本]）参数和数据，确定了包括折射率、消光系数、透射率、介电常数和光导率在内的光学特性。结果表明，随着Fe浓度从0%增加到12%，透射率值增加。带隙能量（[公式：还计算了制备的薄膜的见正文]。[公式：见正文]值介于 3.44 和 3.58 [公式：见正文]eV 之间。然后获得制备的薄膜的分散参数，包括高频介电常数（[公式：见文本]和自由载流子浓度与有效质量之比（N / m [公式：见文本]）。