研究目的
Investigating the effects of substitution of selenium by sulfur on the optical constants of amorphous As20Se80 ? xSx films.
研究成果
The study concluded that the optical bandgap and single-oscillator energy increase with sulfur content, while the refractive index and dispersion energy decrease. The results were interpreted in terms of the chemical bond approach and the Wemple and Di-Domenico model.
研究不足
The study is limited to the effects of sulfur substitution on the optical properties of amorphous As20Se80 ? xSx thin films within the specified composition range. The experimental conditions and material purity may influence the results.
1：Experimental Design and Method Selection:
The study used the thermal evaporation method to prepare amorphous As20Se80 ? xSx thin films. The optical constants were derived from transmission spectra.
2：Sample Selection and Data Sources:
Bulk glasses of As20Se80 ? xSx were synthesized using the melt quenching technique. Thin films were deposited onto glass substrates.
3：List of Experimental Equipment and Materials:
A coating system (Denton Vacuum DV 502 A) was used for deposition. Transmission spectra were recorded using a JASCO V-630 spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The films were deposited at a rate of 10 ?/s. The transmittance spectra were measured from 400 to 2500 nm.
5：Data Analysis Methods:
The envelope technique was used to calculate the refractive index and thickness. The optical bandgap was determined using Tauc’s relationship.
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