Role of Organic Additives in the Sol-Gel Synthesis of Porous CaF2 Anti-Reflective Coatings |
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Authors: | Shinobu Fujihara Yasuhiro Kadota Toshio Kimura |
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Institution: | (1) Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan |
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Abstract: | Porous CaF2 anti-reflective coating films were prepared by the sol-gel method. Effects of organic additives on deposition and optical properties of the films were investigated. Amino alcohols (2-aminoethanol, 2-dimethylaminoethanol, and triethanolamine) and alcohols with larger molecular weights (ethyleneglycol, 2-methoxyethanol, cyclohexanol, and 2-(2-n-butoxyethoxy)ethanol) were chosen as the organic additives. Among these additives, cyclohexanol was the most effective to control the surface morphology and the optical properties of the films. By changing the amount of cyclohexanol in the coating solution, it was possible to control the optical thickness of the CaF2 films. Accordingly, the wavelength giving the maximum transmittance could be changed in the UV region. |
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Keywords: | CaF2 thin film sol-gel anti-reflective coating |
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