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Structural Comparison of Chalcogenide Bulk Glasses and Thermally Evaporated Amorphous Thin Films of Ternary System As-S-Se

Autoři: Bůžek Jan | Pálka Karel | Voynarovych Ivan | Vlček Miroslav

Rok: 2015

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Structural Comparison of Chalcogenide Bulk Glasses and Thermally Evaporated Amorphous Thin Films of Ternary System As-S-Se	Chalcogenide glasses are amorphous materials which contain one or more chalcogen elements (i.e. 16th group elements except for oxygen) together with more positive glass forming element, namely As and Ge. Chalcogenide glasses in general are transparent in IR spectral region. S based glasses are transparent from visible region up to about 12 μm, while Te based glasses are transparent up to about 20 μm, but absorb visible light. Chalcogenide glasses possess relatively high values of refractive index (~ 2 – 3,2). This fact together with IR transmission makes these materials suitable e.g. for optical waveguides fabrication. One of unique properties of amorphous chalcogenides in the form of thin films is their photo- and thermo-sensitivity. It means their structure can be changed by exposition with suitable radiation and/or by annealing. These structural changes cause changes in optical, chemical and physical properties such as photo-darkening, increase in refractive index value or chemical resistance. For the purpose of this research, amorphous chalcogenide bulks and thin films of ternary system As-S-Se were prepared. Their structure was compared using Raman spectroscopy. Photo- and thermo-induced structural changes and consequent changes in their properties were also studied and are presented here.

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