Optical properties of amorphous Ge28-xSe72Sbx thin films

✍ Scribed by S.A. Fayek; S.M. El-Sayed

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 152 KB
• Volume: 39
• Category: Article
• ISSN: 0963-8695
• DOI: 10.1016/j.ndteint.2005.06.002

✦ Synopsis

Bulk glasses of formal composition Ge 28Kx Se 72 Sb x with 0%x%28 were prepared by applying the quench technique. The optical transmission spectra-using a melt were measured in the range from 200 to 1200 nm for Ge 28Kx Se 72 Sb x films which are prepared by thermal evaporation technique. A simple, straightforward procedure suggested by Swanepoel, which is based on the use of interference fringes, has been applied to calculate the film thickness. On other hand the driving absorption coefficient (a), consequently the band tail width E e and the optical band gap have been estimated. The real (3 0 ) and imaginary parts (3 00 ) of the dielectric constant have been determined and the optical band gap can also be calculated as a function of imaginary part (3 00 ). The dispersion parameters such as E 0 (single-oscillator energy), E d (dispersive energy) and M K1 , M K3 (moments) were discussed in terms of the single-oscillator Wemple-DiDomenico model.