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Substituting sulfide by selenide in CdSe1−xSx nano-films onto polymer substrate: Structural and optical properties |
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PP: 227-239 |
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doi:10.18576/ijtfst/140309
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Author(s) |
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A. N. Abouelkhir,
M. Tag El-Dine,
E. R. Shaaban,
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Abstract |
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| In this work, thin films of the ternary alloy CdSe1−xSx were deposited onto flexible polymer substrates using thermal evaporation, and their structural and optical characteristics were systematically analyzed. The study aimed to understand how progressive substitution of selenium with sulfur influences the crystalline structure, band gap, and optical parameters of the material. X-ray diffraction results confirmed that all compositions retained a hexagonal wurtzite phase, with increasing sulfur concentration leading to reduced crystallite size and enhanced micro strain attributed to lattice distortion caused by ionic size mismatch. Optical investigations using UV–Vis–NIR spectroscopy indicated a noticeable blue shift in the absorption edge, consistent with bandgap widening due to quantum confinement. The refractive index and extinction coefficient were extracted through Fresnel analysis and the Swanepoel method, both revealing a strong dependence on sulfur content. These findings highlight the potential of CdSe1−xSx films for integration into light weight and flexible optoelectronic systems, including solar cells and photodetectors, where material adaptability is essential. |
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