Vacuum-ultraviolet ellipsometry spectra and structural properties of Pb(Zr,Ti)O3 films
| Autor: | Gerald Gerlach, A. Dejneka, Lubomir Jastrabik, Dagmar Chvostova, Anna Lynnyk, J. Kousal, Gunnar Suchaneck, V. Železný |
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| Rok vydání: | 2011 |
| Předmět: |
Range (particle radiation)
Materials science Metals and Alloys Analytical chemistry Mineralogy Surfaces and Interfaces Dielectric Spectral line Surfaces Coatings and Films Electronic Optical and Magnetic Materials Vacuum ultraviolet Lattice constant Ellipsometry Materials Chemistry Absorption (chemistry) Perovskite (structure) |
| Zdroj: | Thin Solid Films. 519:2885-2888 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2010.11.076 |
| Popis: | Optical properties of PbZr x Ti 1 − x O 3 material have been actively studied in the visible and near band-gap region, but data in the vacuum-ultraviolet spectral region is rather scarce. In this work we focus on well known interband transitions for the perovskite materials, 2 p → dγ , located in VUV spectral region. Dielectric functions of chemical solution deposited and sputtered PZT were obtained in the spectral range 1–8.8 eV. Differences between the absorption maxima for chemical solution deposited and sputtered PbZr x Ti 1 − x O 3 samples near Kahn–Leyendecker 2 p → dγ interband transition were found and are interpreted by change of interatomic distances. This is confirmed by different lattice constants. In the case of PbZr x Ti 1 − x O 3 film with microcracks, the void fraction was estimated from the effective medium approximation. Direct band-gap energies appear to be nearly the same for all reactive sputtered samples weakly depending of Zr/Ti concentration. |
| Databáze: | OpenAIRE |
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