"

Cookies ussage consent

I agree.

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

Effect of composition on optical constants of Pb: GeSbTe chalcogenide thin films

J. KUMAR1, P. KUMAR1, N. SURI1, M. AHMAD1, R. THANGARAJ1,* , T. STEPHEN SATHIARAJ2

Affiliation

  1. Semiconductors Laboratory, Department of Applied Physics, Guru Nanak Dev Univeristy, Amritsar-143005, India
  2. Department of Physics, University of Botswana, Botswana

Abstract

Optical properties of Pb doped ternary Ge-Sb-Te chalcognide films prepared by thermal evaporation have been studied in the visible and near-infrared spectral regions. The straightforward analysis proposed by Swanepoel has been successfully employed and it has allowed us to accurately determine the refractive index and extinction coefficient of the films. The refractive index has been determined from the upper and lower envelopes of the transmission spectra. The absorption coefficient and extinction coefficient have been determined from the transmission spectra in the strong-absorption region. The dispersion of the refractive index is discussed in terms of the Wemple–DiDomenico single oscillator model.

Keywords

Chalcogenide; Thin films; Optical properties; Ge2Sb2Te5 (GST).

Citation

J. KUMAR, P. KUMAR, N. SURI, M. AHMAD, R. THANGARAJ, T. STEPHEN SATHIARAJ, Effect of composition on optical constants of Pb: GeSbTe chalcogenide thin films, Optoelectronics and Advanced Materials - Rapid Communications, 2, 10, October 2008, pp.635-639 (2008).

Submitted at: Aug. 1, 2008

Accepted at: Oct. 2, 2008