Properties of GexAs45-xSe55 Series Bulk Glasses and Amorphous Thin Films

摘要

oWe have evaluated GexAs45-xSe55 glass series for potential applications in infrared optics, photonics, lithography etc. The samples were characterized for density, thermal properties by differential scanning calorimeter, and Vis-NIR optical transmission spectra. With the addition of Ge, the density of bulk samples decreased,whereas the glass transition temperature (Tg) increased. Moreover, the variation of density and Tg for bulk samples showed a turning point at x~10. On the other hand,thin films showed that compositional dependence of the optical band-gap and the refractive index at fixed wavelength which decreased and increased respectively with increasing Ge content. This may be due to the formation of a significant number of homopolar Ge-Ge bonds.