Sol-gel preparation of silica and titania thin films

Tomáš Thoř; Jan Václavík

doi:10.1117/12.2257325

11 November 2016 Sol-gel preparation of silica and titania thin films

Tomáš Thoř, Jan Václavík

Proceedings Volume 10151, Optics and Measurement International Conference 2016; 101511A (2016) https://doi.org/10.1117/12.2257325
Event: Optics and Measurement 2016 International Conference, 2016, Liberec, Czech Republic

Abstract

Thin films of silicon dioxide (SiO₂) and titanium dioxide (TiO₂) for application in precision optics prepared via the solgel route are being investigated in this paper. The sol-gel process presents a low cost approach, which is capable of tailoring thin films of various materials in optical grade quality. Both SiO₂ and TiO₂ are materials well known for their application in the field of anti-reflective and also highly reflective optical coatings. For precision optics purposes, thickness control and high quality of such coatings are of utmost importance. In this work, thin films were deposited on microscope glass slides substrates using the dip-coating technique from a solution based on alkoxide precursors of tetraethyl orthosilicate (TEOS) and titanium isopropoxide (TIP) for SiO₂ and TiO₂, respectively. As-deposited films were studied using spectroscopic ellipsometry to determine their thickness and refractive index. Using a semi-empirical equation, a relationship between the coating speed and the heat-treated film thickness was described for both SiO₂ and TiO₂ thin films. This allows us to control the final heat-treated thin film thickness by simply adjusting the coating speed. Furthermore, films’ surface was studied using the white-light interferometry. As-prepared films exhibited low surface roughness with the area roughness parameter Sq being on average of 0.799 nm and 0.33 nm for SiO₂ and TiO₂, respectively.

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Tomáš Thoř and Jan Václavík "Sol-gel preparation of silica and titania thin films", Proc. SPIE 10151, Optics and Measurement International Conference 2016, 101511A (11 November 2016); https://doi.org/10.1117/12.2257325

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KEYWORDS

Thin films

Thin film coatings

Sol-gels

Silica

Humidity

Liquids

Optical coatings

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