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Abstract
The optical constants (absorption coefficient ( α), refractive index ( n), extinction coefficient ( k), real and imaginary part of dielectric constant) have been studied for a-Se 96− x Te 4Ag x (where x = 0 , 4, 8, 12) thin films as a function of photon energy in the wavelength range (500–1000 nm). It has been found that the optical band gap increases while n and k decreases on incorporation of Ag in Se–Te system. The value of α and k increases, while the value of n decreases with incident photon energy. The results are interpreted in terms of the change in concentration of localized states due to the shift in fermi level. A correlation between the optical band gap and electronegativity of the alloys indicates that the optical band gap increases with the decrease of electronegativity.
Published Version
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