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Neha Sharma,Sunanda Sharda,S.C. Katyal,Vineet Sharma,Pankaj Sharma 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
We report linear and non-linear optical properties of a new quaternary chalcogenide glass series Ge19-ySe63.8Sb17.2Tey (y = 0, 2, 4, 6, 8, 10). In linear optical properties; refractive index, extinction coefficient and the Tauc gap are reported and their variation with Te content has been discussed. In non-linear properties; third order nonlinear susceptibility and non-linear refractive index has been discussed. The variation of non-linear refractive index has also been reported with normalized photon energy. A correlation between the Tauc gap and nonlinear refractive index has been discussed. Results indicate that these materials may find applications in modern optical devices.
Neha Sharma,Sunanda Sharda,Dheeraj Sharma,Vineet Sharma,P. B. Barman,S.C. Katyal,Pankaj Sharma,S. K. Hazra 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
Steady state current-voltage characteristics of the amorphous (Se80Te20)98Y2 (Y = Ag, Bi, Ge, Cd) semiconductors at different temperatures are reported. The measurements were performed using direct-current voltage bias to understand the basic conductivity mechanism and to evaluate the impact of each substituent on electrical response. The space charge limited conduction mechanism, and the density of states near Fermi level have been calculated. The difference in electrical response due to different substitutions in the glassy matrix is analyzed.