부산대학교 도서관

The optical transmission spectra of amorphous Ge-Se films of chemical composition GeSe3, prepared by thermal evaporation, are measured overthe 300 nm to 2500 nm spectral region. A simple, straightforward procedure suggested by Swanepoel, which is based on the use of interference fringes, has been applied in order to derive the real and imaginary parts of the complex refractive index, and also the film thickness. Furthermore, thickness measurements made by a surface-profiling stylus are also carried out to cross-check the results obtained by the present optical method, employing only T(λ). The dispersion of nis discussed in terms of the single-oscillator Wemple and DiDomenico model, and the optical band gap Egopthas been determined from the absorption coefficient values, using the Tauc procedure.