کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5360188 1388257 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of Ag addition on the optical properties of Se90Te10 films
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
The effect of Ag addition on the optical properties of Se90Te10 films
چکیده انگلیسی
Se90Te10−xAgx (0 ≤ x ≤ 6) compositions were prepared by quenching technique. Thin films with different thicknesses of the obtained compositions were deposited on dry clean glass substrates by thermal evaporation technique. Energy dispersive X-ray spectroscopy (EDX) indicates that samples are nearly stoichiometric. X-ray diffraction patterns indicate that they are in the amorphous state. The optical constants, the refractive index n and the absorption index k, have been calculated from transmittance T and reflectance R through the spectral range of 400-2500 nm for the studied films with different thicknesses (165-711 nm). From the analysis of refractive index n data, high frequency dielectric constant ɛ∞ was determined. Both ɛ∞ and n are found to decrease with the increase of Ag content. The optical band gap Egopt is calculated for all compositions from the absorption coefficient analysis. The effect of the Ag addition on the obtained optical parameters has been discussed. The analysis of absorption index k data, revealed the existence of allowed indirect transitions for all compositions. It is indicated also that Egopt increase with increasing Ag content.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 255, Issue 8, 1 February 2009, Pages 4590-4594
نویسندگان
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