Low Temperature Preparation of High Refractive Index and Mechanically Resistant Sol-gel TiO2 Films for Multilayer Antireflective Coating Applications |
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Authors: | M. Langlet M. Burgos C. Coutier C. Jimenez C. Morant M. Manso |
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Affiliation: | (1) Laboratoire des Matériaux et du Génie Physique, INPG-ENSPG, UMR 5628 CNRS, BP 46, 38402 Saint Martin d'Hères, France;(2) Dpt. Fisica Applicada C-XII, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid, Spain |
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Abstract: | TiO2 sol-gel thin films have attracted a large attention for applications which require high refractive index transparent layers. In this work, sol-gel TiO2 layers were prepared by Aerosol-gel deposition followed by a thermal treatment procedure in air. Depending on the experimental conditions, abrasion resistant and high refractive index layers could be obtained after post-treatment at only 110°C. In this paper, the experimental parameters which allow the preparation of functional TiO2 sol-gel layers at such low temperature are discussed. It is concluded that the preparation of high refractive index and mechanically resistant TiO2 layers can be interpreted in terms of competition between polycondensation and densification mechanisms. This result allows to envisage the sol-gel processing at low temperature of multilayer antireflective coatings. |
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Keywords: | sol-gel antireflective multilayers low temperature processing TiO2 films |
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