کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7117492 1461361 2018 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Diffuse reflectance spectroscopy: An effective tool to probe the defect states in wide band gap semiconducting materials
ترجمه فارسی عنوان
طیف سنجی بازتابی متناسب: یک ابزار موثر برای بررسی وضعیت نقص در مواد نیمه رسانای شکاف باند وسیع است
کلمات کلیدی
طیف سنجی بازتابی اولین محاسبات اصلی، تیتانیوم، روی اکسید شکاف باند وسیع،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی برق و الکترونیک
چکیده انگلیسی
Optical properties of widely used semiconducting oxides namely; TiO2, ZnO and ZrO2 were investigated using diffuse reflectance spectroscopy (DRS). Prior to the optical absorption measurements, the structural purity of these samples was examined using powder x-ray diffraction experiments carried out on Indus-2 synchrotron source. It is observed that all the studied samples are structurally pure. The DRS of all the studied samples show an extra peak much below fundamental band gap. In order to understand the origin of the said low energy peak, the theoretical optical absorption spectra for these samples have been simulated. The simulations were performed using density functional theory, considering, ideal as well as defected systems i.e. by considering vacancy at all possible sites (for TiO2 we have considered the vacancy at Ti site and also at O site taking in to account surface and bulk effects). It is observed that the simulated optical spectra show very similar feature as that of experimental optical absorption for oxygen vacancy. Photoluminescence spectroscopy further supports the presence of defect states in the studied samples. Thus; it appears that the diffuse reflectance spectroscopy is a useful tool to probe the signature of defects present in the sample.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science in Semiconductor Processing - Volume 86, 1 November 2018, Pages 151-156
نویسندگان
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