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• W2085686242 abstract "Phase change Ga15Se77Ag8 chalcogenide thin films were prepared by thermal evaporation technique. Thin films were then irradiated by Transverse Electrical Excitation at Atmospheric Pressure (TEA) nitrogen laser for different time intervals. The X-ray structural characterization revealed the amorphous nature of as-prepared films while the laser irradiated films show the polycrystalline nature. Field Emission Scanning Electron Microscope (FESEM) has been used to study the structural changes. The results are discussed in terms of the structural aspects and amorphous to crystalline phase change in Ga15Se77Ag8 chalcogenide thin films. The observed changes are associated with the interaction of the incident photon and the lone-pairs electrons which affects the band gap of the Ga15Se77Ag8 chalcogenide thin films. The optical constants of these thin films are measured by using the absorption spectra measurements as a function of photon energy in the wavelength region 400–1100 nm. It is found that the optical band gap decreases while the absorption coefficient and extinction coefficient increases with increasing the laser-irradiation time. The decrease in the optical band gap has been explained on the basis of change in nature of films, from amorphous to polycrystalline state. The dc conductivities and activation energies of these thin films are also measured in temperature range 313–393 K. It has been found that the activation energy in Ga15Se77Ag8 thin films decreases whereas the dc conductivity increases at each temperature by increasing the laser-irradiation time." @default.
• W2085686242 created "2016-06-24" @default.
• W2085686242 creator A5049696382 @default.
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• W2085686242 date "2013-02-01" @default.
• W2085686242 modified "2023-09-24" @default.
• W2085686242 title "Characterization of phase change Ga15Se77Ag8 chalcogenide thin films by laser-irradiation" @default.
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• W2085686242 doi "https://doi.org/10.1016/j.jallcom.2012.10.149" @default.
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