Metallic Oxynitride Thin Films by Reactive Sputtering and Related Deposition Methods: Process, Properties and Applications

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Oxynitride thin film technology is rapidly impacting a broad spectrum of applications, ranging from decorative functions (through optoelectronics) to corrosion resistance. Developing a better ...
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Tuneable Properties of Aluminium Oxynitride Thin Films

Pp. 195-229 (35)

Joel Borges, Nuno P. Barradas, Eduardo Alves, Nicolas Martin, Marie-France Beaufort, Sophie Camelio, Dominique Eyidi, Thierry Girardeau, Fabien Paumier, Jean-Paul Rivière, Filipe Vaz and Luis Marques

Abstract

In this subchapter is discussed some characteristics and properties of AlOxNy thin films produced by reactive DC magnetron sputtering. The films were deposited using Ar as working gas and a reactive gas mixture of N2+O2 (17:3). The reactive gas flow was varied in order to produce a wide range of chemical compositions. Sub-stoichiometric AlOxNy films, with CO+N/CAl atomic ratios up to 0.85 were produced, with Al-type crystalline structure. Transmission electron microscopy (TEM) analysis and X-ray photoelectron spectroscopy (XPS) spectra suggests that the films are a percolating network, composed by aluminium nanocrystals with different shapes and sizes embedded in an oxide/nitride matrix. The particular composition, structure and morphology of the films results in very different electrical properties, which can be explained using a tunnel barrier conduction mechanism for the electric charge transport, as well as distinct optical responses, such as an unusual large broadband absorption for some films.

Keywords:

Reactive DC magnetron sputtering, thin films, AlOxNy, target potential, deposition rate, composition, structure, grain size, morphology, percolating network, XPS, TEM, electrical and optical properties, reflectance, refractive index, extinction coefficient, electrical resistivity, temperature coefficient of resistance (TCR), broadband absorption.

Affiliation:

Centro de Física, Universidade do Minho, 4710-057 Braga, Portugal