Effect of Ag Content on the Optical Properties of a- Ge15 Se85-x Agx Alloys | ||||
| Egyptian Journal of Solids | ||||
| Article 3, Volume 25, Issue 1, 2002, Page 23-32 PDF (132.59 K) | ||||
| DOI: 10.21608/ejs.2002.150460 | ||||
 View on SCiNiTO | ||||
| Abstract | ||||
| Optical reflection and transmission spectra, at normal incidence, of amorphous Ge15 Se85-x Agx (x = 0, 10, 20) chalcogenide glass thin films, have been obtained in the range 400-2400 nm. Investigated films have been deposited by thermal evaporation. The optical constants of the films were determined using the method proposed by Swanepoel. The method allows determination of both the real (n) and imaginary (k) parts of the complex refractive index, and the film thickness (d). The optical energy gap has been estimated from the absorption coefficient values using Tauc’s procedure. It is found that, the films exhibit indirect gap, which decreases with increasing Ag content. The dispersion of (n) is discussed in terms of the single–oscillator Wemple- DiDomenico model. | ||||
|
Statistics Article View: 51 PDF Download: 42 |
||||
