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Proceedings Paper

Structural, compositional, and optical characterization of thin TiOxNy coatings fabricated by dual ion beam sputtering
Author(s): Antonella Rizzo; L. Mirenghi; Leander Tapfer; Marco Alvisi; Lorenzo Vasanelli; Francesca Sarto; Salvatore Scaglione
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Paper Abstract

Titanium oxynitride (TiOxNy) thin films are of great interest for the fabrication of protective optical coatings. By varying the oxygen and nitrogen content in the films, the electrical, optical and mechanical properties of these coatings can be tailored properly. In this work, we fabricated TiN and TiOxNy films by dual ion beam sputtering technique. TiOxNy films were ion-assisted by a low energy oxygen and nitrogen mixed ion beam of variable O/N flux ratio. We observe that the incorporation of oxygen greatly improves the adhesion of the film on the glass substrate. Further, the optical extinction coefficient drastically decreases for increasing oxygen content, suggesting new applications of TiOxNy films as protective coatings on transparent substrates. The film composition by XPS analyses is in agreement with the results obtained by a simple model to describe the ion assistance phenomena. The crystallographic structure of the deposited films was characterized by using (Theta) - 2(Theta) x-ray diffraction and grazing incidence x-ray diffraction measurements. In the range up to 14 percent of the oxygen to nitrogen flux ratio, a TiN f.c.c. phase structure with preferred (111) growth-orientation of the grains is observed. For higher oxygen concentrations the absence of diffraction peaks suggests a more amorphous-like structure of the deposited film. Specular x-ray reflectivity measurements provide important and accurate information about the film-air and film-substrate interface roughness. The Kiessig fringes are caused by multiple internal interference of the x-ray beam and can be observed up to 3 degrees, which is a clear indication of the high homogeneity of the film thickness and of sharp interfaces.

Paper Details

Date Published: 19 August 1996
PDF: 8 pages
Proc. SPIE 2776, Developments in Optical Component Coatings, (19 August 1996); doi: 10.1117/12.246827
Show Author Affiliations
Antonella Rizzo, Pastis-CNRSM Scpa (Italy)
L. Mirenghi, Pastis-CNRSM Scpa (Italy)
Leander Tapfer, Pastis-CNRSM Scpa (Italy)
Marco Alvisi, INFM (Italy)
Lorenzo Vasanelli, INFM (Italy)
Francesca Sarto, ENEA (Italy)
Salvatore Scaglione, ENEA (Italy)

Published in SPIE Proceedings Vol. 2776:
Developments in Optical Component Coatings
Ian Reid, Editor(s)

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