OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

Microstructure, porosity and roughness of RF sputtered oxide thin films: Characterization and modelization

Oudrhiri-Hassani, Fahd and Presmanes, Lionel and Barnabé, Antoine and Tailhades, Philippe Microstructure, porosity and roughness of RF sputtered oxide thin films: Characterization and modelization. (2008) Applied Surface Science, vol. 254 (n° 18). pp. 5796-5802. ISSN 0169-4332

[img]
Preview
(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
916kB

Official URL: http://dx.doi.org/10.1016/j.apsusc.2008.03.149

Abstract

Spinel CoMnFeO4 thin films are stable materials useful to study the influence of radio-frequency (RF) sputtering experimental conditions on the microstructure of oxide films. It has been demonstrated by various techniques such as electronic and atomic force microscopy (AFM), gas adsorption techniques and ellipsometry, that films prepared with 0.5 Pa sputtering argon pressure and 5 cm target–substrate distance are very dense. On the other hand, the samples obtained under higher pressure and/or longer distances are microporous with a mean pore size generally lower than 2 nm. The specific surface areas of such films reach about 75 m2/g. According to the simple model proposed, the films are made of three layers. From the bottom to the top of the film, the first one at the interface with the substrate is 100% dense. The second layer is made of cylindrical rods set up according to a compact plane. Its porosity is due to the lattice interstices. Hemispheric domes covering each rod make up the third layer, which displays a degree of roughness related to the shape and the hexagonal arrangement of the domes. The surface enhancement factor (SEF), the porosity and roughness, calculated from the model, are in corroboration with the experimental values. The porosity factor is however slightly underestimated by the model for very porous samples.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Applied Surface Science website : http://www.sciencedirect.com/science/journal/01694332
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Statistics:download
Deposited By: Celine Cabaup
Deposited On:16 Apr 2009 12:43

Repository Staff Only: item control page