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Title: An Optical Study of Chalcogenide Glasses Using UV Vis NIR Spectroscopy
Researcher: Sharma, Pankaj
Guide(s): Katyal, S.C.
Keywords: Chalcogenide Glasses
Upload Date: 11-Sep-2013
University: Jaypee University of Information Technology, Solan
Completed Date: 21/11/2008
Abstract: The work reported in this thesis is concerned with the study of optical properties of Ge-Se-Te system and the effect of metal impurities (Bi, Cd, Pb and Sn) on the optical properties of As-Se-Ge system. Various bulk samples and their thin films prepared and studied are: newline1.Ge10Se90-xTex ; x = 0, 10, 20, 30, 40, 50. newline2.(As2Se3)90Ge10 newline3.[(As2Se3)90Ge10]95M5 ; M = Bi, Cd, Pb and Sn. newlineBulk samples were prepared by melt quench technique. Thin films of prepared samples were deposited using thermal evaporation technique at base pressure of ~10-4 Pa. X-ray diffraction technique has been used to know the nature (amorphous or crystalline) of bulk and deposited films. Far-infrared transmission spectra have been obtained from FT-IR spectrophotometer to study the bonding arrangements in Ge-Se-Te system. The optical properties (refractive index and extinction coefficient) have been estimated by analyzing the transmission spectra (200 2400 nm) obtained from ultraviolet-visible-near infrared spectrometer. Swanepoel s method has been used to determine refractive index and extinction coefficient. Optical band gap has been determined using Tauc extrapolation. The effect of deposition parameters (type of substrates, thickness and substrate temperature) has been examined on the refractive index and optical energy gap of Ge-Se-Te thin films. Physical properties (coordination number, density, compactness, theoretical energy gap, cohesive energy and heat of atomization) of Ge-Se-Te glassy alloys have also been determined. The effect of metal impurities (Bi, Cd, Pb and Sn) on the optical properties has been studied for As-Se-Ge thin films. newline
Appears in Departments:Department of Physics and Material Science

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01_title.pdfAttached File79.38 kBAdobe PDFView/Open
02_certificate.pdf151.84 kBAdobe PDFView/Open
03_acknowledgement.pdf178.58 kBAdobe PDFView/Open
04_contents.pdf350.09 kBAdobe PDFView/Open
05_list of tables figures.pdf895.43 kBAdobe PDFView/Open
06_chapter 1.pdf2.44 MBAdobe PDFView/Open
07_chapter 2.pdf1.89 MBAdobe PDFView/Open
08_chapter 3.pdf801.58 kBAdobe PDFView/Open
09_chapter 4.pdf4.87 MBAdobe PDFView/Open
10_chapter 5.pdf1.44 MBAdobe PDFView/Open
11_chapter 6.pdf2.61 MBAdobe PDFView/Open
12_chapter 7.pdf371.5 kBAdobe PDFView/Open

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