Optical properties of ternary ZnS x Se1?x polycrystalline thin films
| Autor: | M. A. Kenawy, H. T. El-Shair, M.M. El-Nahass, A. A. El-Shazly, M. M. H. El-Naby, A. M. Ebrahim |
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| Rok vydání: | 1985 |
| Předmět: |
chemistry.chemical_classification
Physics and Astronomy (miscellaneous) business.industry Band gap General Engineering Analytical chemistry General Chemistry Evaporation (deposition) Pseudopotential Optics chemistry General Materials Science Thin film business Ternary operation Absorption (electromagnetic radiation) Inorganic compound Refractive index |
| Zdroj: | Applied Physics A Solids and Surfaces. 36:51-53 |
| ISSN: | 1432-0630 0721-7250 |
| Popis: | Ternary ZnSxSe1−x polycrystalline thin films were prepared by evaporation in vacuum of 10−5 Torr. The molecular fractionx varied in the region o≦x≦1. The optical constants (the refractive indexn, the absorption indexk, and the absorption coefficientα) were determined in the wavelength range 300–1600nm. A plot representingα2=f(hv) shows that the ZnSxSe1−x polycrystalline thin films of different compositions have two direct transitions corresponding to the energy gapsE andE+Δ. The variation in eitherE orE+Δ withx indicates that this system belongs to the amalgamation type. Such variation follows a quadratic equation. The bowing parameter was found to be 0.456 eV, roughly equal to the calculated value 0.60 eV using the empirical pseudopotential method based on the virtual-crystal approximation, in which the disorder effect has not been taken into account. |
| Databáze: | OpenAIRE |
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