Abstract Se90Pb10 and Se90Pb8Sn2 thin films of thickness 400 nm were evaporated on glass substrates. The glassy nature of the prepared films was ascertained by differential scanning calorimeter thermograms and X-ray diffraction patterns. Spectra of reflection and transmission of the prepared films were recorded using FilmTek3000 in the wavelength range of 300–900 nm. The absorption coefficient was calculated and used to evaluate the optical band gap energy which comes out to be 2.1 and 2.2 eV for SePb and SePbSn thin films, respectively. The extinction coefficient (k), refractive index (n), real (e′) and imaginary (e") dielectric constants were also obtained. Results indicate that the addition of Sn content reduces the value of (n), (e′) and (e"), while that of k increases. The observed changes in the studied optical parameters were interpreted depending on the chemical bond approach of Tichy and Ticha.

中文翻译：

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Sn含量对Se90Pb10-x薄膜光学性能的影响

摘要 在玻璃基板上蒸镀了厚度为 400 nm 的 Se90Pb10 和 Se90Pb8Sn2 薄膜。通过差示扫描量热仪热谱图和 X 射线衍射图确定所制备薄膜的玻璃性质。使用 FilmTek3000 在 300-900 nm 的波长范围内记录所制备薄膜的反射和透射光谱。计算吸收系数并用于评估 SePb 和 SePbSn 薄膜的光学带隙能量，分别为 2.1 和 2.2 eV。还得到了消光系数 (k)、折射率 (n)、实数 (e') 和虚数 (e") 介电常数。结果表明添加 Sn 降低了 (n)、(e') 的值和 (e")，而 k 的增加。