Optical properties and phase composition of α-C:H films
| Autor: | G. F. Ivanovsky, V.M. Elinson, A.A. Kuzin, Alexander Baranov, Vladimir Sleptsov, Kondrashov Pavel E, S.S. Gerasimovich |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
chemistry.chemical_classification
Range (particle radiation) Band gap Chemistry business.industry Superlattice Polymer Condensed Matter Physics Molecular physics Electronic Optical and Magnetic Materials Amorphous solid Optics Extinction (optical mineralogy) Materials Chemistry Ceramics and Composites business Refractive index Deposition (law) |
| Zdroj: | Journal of Non-Crystalline Solids. 136:53-59 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/0022-3093(91)90118-p |
| Popis: | The possibility of using α-C:H films for amorphous superlattices synthesis is investigated. For this purpose the dependence of optical properties on growth conditions as well as on film thickness is determined. The refractive index, n , extinction, k , and film thickness, d , are calculated from the measurement of light transmission and reflectivity in the range 0.85–3.5 eV. On the basis of the calculations, optical band gap of α-C:H films is estimated. It is shown that optical band gap is changed from 0.55 up to 1.9 eV and depends on deposition conditions. By means of effective medium approximation, it is shown that the optical properties of a film change with phase composition. It is found that the films contain diamond-like, graphite-like and polymer phases. Multilayer periodic structures based on the α-C:H films with different band gaps were synthesized. The thicknesses of the layers are in the range 8.0–25.0 nm. The optical properties and band gap of these structure are investigated. It is shown that these structures have two values for an optical band gap. |
| Databáze: | OpenAIRE |
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