A novel polymer-semiconductor nanocomposites of polyvinyl alcoholoxovanadium chloride (PVA-VOCl) films have been successfully synthesized by the simple solution casting technique. XRD analysis of the prepared films confirms the formation of VOCl nanocrystals with different particle sizes distributed in the PVA polymer resulting in the increment in the crystalline phase of the whole structure of PVA-VOCl polymer nanocomposite. The Fourier transform infrared (FT-IR) spectroscopy measurements indicate the distribution of VOCl in the polymer matrix. The optical absorption spectra measurements exhibit a complete blocking of the UV range (200–400 nm) due to VOCl dispersion in the polymer matrix. The optical gap E_g of the films were determined with a high degree of precision using Tauc relation, Absorption spectra fitting and the new accurate geometric method show a strong decrease from 5.2 eV for pure PVA to 2.85 eV with increasing the VOCl level in the polymer film. In addition, the high-frequency refractive index estimated from the optical gap values exhibits a significant increase from 1.70 to 2.07. Our samples can be considered as an innovative flexible optical material for UV filters, optoelectronics, and photonics applications.

中文翻译：

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高精度确定用于柔性聚合物半导体器件的创新技术（PVA-VOCl）的结构和光学参数

通过简单的溶液流延技术成功地合成了一种新型的聚乙烯醇氧钒氯化物（PVA-VOCl）薄膜聚合物-半导体纳米复合材料。所制备的膜的XRD分析证实了在PVA聚合物中分布的具有不同粒径的VOCl纳米晶体的形成，导致了PVA-VOCl聚合物纳米复合物的整个结构的结晶相的增加。傅里叶变换红外（FT-IR）光谱测量表明VOCl在聚合物基质中的分布。由于VOCl在聚合物基质中的分散，光学吸收光谱测量显示出对UV范围（200–400 nm）的完全阻挡。光学间隙E _g使用Tauc关系式以高精确度确定了薄膜的膜厚，吸收光谱拟合和新的精确几何方法显示，随着聚合物膜中VOCl含量的增加，纯PVA的分子量从5.2 eV下降到2.85 eV。另外，由光学间隙值估计的高频折射率显示出从1.70到2.07的显着增加。我们的样品可以被认为是用于紫外线滤光片，光电和光子学应用的创新型柔性光学材料。