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OPTICAL BAND GAP AND OPTICAL CONSTANTS IN Se85Te15-XPbX THIN FILMS

V. Pandey1, N. Mehta1, S. K. Tripathia2, A. Kumar1,*

Affiliation

  1. Department of Physics, Harcourt Butler Technological Institute, Kanpur-208 002, India
  2. Department of Physics, Panjab University, Chandigarh – 160 014, India

Abstract

Thin films of Se85Te15-xPbx (x = 0, 2, 4 & 6) are deposited under vacuum on glass substrates by thermal evaporation technique. The optical constants (refractive index ‘n’, absorption coefficient ‘a’, and extinction coefficient ‘k’) have been calculated in the wavelength range (400 – 2000 nm) using a transmission spectrum. The refractive index ‘n’ increases and extinction coefficient ‘k’ decreases with the wavelength. Data are analyzed by Swanepoel method. It has been found that optical energy gap Eg decreases with Pb content..

Keywords

Chalcogenide glasses, Optical properties, Optical band gap.

Submitted at: Feb. 16, 2005
Accepted at: Sept. 22, 2005

Citation

V. Pandey, N. Mehta, S. K. Tripathia, A. Kumar, OPTICAL BAND GAP AND OPTICAL CONSTANTS IN Se85Te15-XPbX THIN FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 5, pp. 2641-2646 (2005)