摘要
Compositional dependencies of the optical and physical properties of as-deposited amorphous GexSe90鈭?em>xIn5 films (with 5鈮?em>x鈮?0 at%), prepared by thermal evaporation have been studied. The optical energy gap is derived from Tauc's extrapolation in the strong absorption region in terms of transmission and reflection spectra. The relationship between the optical gap and chemical composition of the GexSe90鈭?em>xIn5 (with 5鈮?em>x鈮?0 at%) amorphous system is discussed in terms of the chemical bond approach. The refractive index, n and film thickness, d have been determined by an envelope method using transmission spectra. It is observed that the refractive index, n of GexSe90鈭?em>xIn5 thin films increases with increasing x, over the entire spectral range, which is related to both the increased density and average coordination number.