کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5442868 1510768 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Role of Te on the spectroscopic properties of As50Se40Te10 thin films: An extensive study by FTIR and Raman spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Role of Te on the spectroscopic properties of As50Se40Te10 thin films: An extensive study by FTIR and Raman spectroscopy
چکیده انگلیسی
Amorphous As50Se50 and As50Se40Te10 thin films were prepared on glass substrates by using thermal evaporation method. The transmission spectra T (λ) of the films at normal incidence were measured in the wavelength range 400-1100 nm. A straightforward analysis proposed by Swanepoel based on the use of the maxima and minima of the interference fringes has been used to drive the refractive index(n) and the extinction coefficient(k). The addition of Te into As50Se50 is found to increase the refractive index and the extinction coefficient of the As50Se40Te10 films. With the addition of Te into As50Se50, the optical band gap decreases due to the increase in disorderness. The urbach energy and tauc parameter is changed due to the Te incorporation which measures the disorderness. The optical absorption is due to allowed indirect transition and the chemical bond approach has been applied successfully to interpret the decrease of the optical gap. The Raman shift observed in the two films clearly supports the optical changes due to Te addition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 66, April 2017, Pages 616-622
نویسندگان
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