Sol-gel Preparation of Anti-Fogging SiO2/SiO2-TiO2 Double-layer Antireflective Coating †

doi:10.7503/cjcu20180849

Abstract

Abstract:

SiO₂/SiO₂-TiO₂ double-layer antireflective(AR) coating with high transmittance and excellent mechanical property was designed and prepared by sol-gel method based on the intrinsically robust sol-gel acid-catalyzed SiO₂ and TiO₂ thin films. It was found that the maximum transmittance of the obtained double-layer antireflective coating reached 99.9%, well in accordance with the simulated one. After abrasion and hardness test, the transmittance spectra all changed little compared with the original one; and this double-layer AR coating could withstand the 4H pencil hardness test, showing an excellent mechanical property. Moreover, this double-layer coating was superhydrophilic, hence the coating possessed excellent anti-fogging property. The high transmittance, excellent mechanical and anti-fogging property make this double-layer $Si O 2 / Si O 2 - Ti O 2$ AR coating an alternative candidate in the field of solar cells.

Key words: Thin film design, Double-layer antireflective coating, Mechanical property, Superhydrophilicity, Anti-fogging property

CLC Number:

O613

TrendMD:

YE Longqiang,KANG Shuo,ZHANG Weihao,ZHANG Yulu,HUI Zhenzhen,JIANG Bo. Sol-gel Preparation of Anti-Fogging SiO₂/SiO₂-TiO₂ Double-layer Antireflective Coating ^†[J]. Chem. J. Chinese Universities, 2019, 40(11): 2274.

Figures/Tables 7

Fig.1 Dispersion curves of B-SiO2, TiO2 and SiO2-TiO2 films after heat-treatment at 400 ℃(A) and simulated transmittance spectrum of the designed λ/4-λ/4 double-layer antireflective coatings(B) The inset in (B) is the schematic drawing of the double-layer AR coatings.

Fig.2 Change of the refractive index of SiO2-TiO2 composite film at 550 nm with the mass fraction of TiO2

Fig.3 Simulated and experimental transmittance spectra of the SiO2/SiO2-TiO2 double-layer antireflective coating(A) and transmittance spectra of TiO2, SiO2, SiO2-TiO2 single-layer coating and SiO2/SiO2-TiO2 double-layer coating with the same total film-thickness of 173 nm(B)

Fig.4 Cross-sectional SEM image(A) and surface AFM image(B) of the SiO2/SiO2-TiO2 double-layer coating

Fig.5 Transmittance spectra of SiO2/SiO2-TiO2 double-layer antireflective coating before and after abrasion and adhesion test

Fig.6 Water contact angles of K9 substrate(A) and SiO2/SiO2-TiO2 double-layer coating before(B) and after(C) heat-treatment

Fig.7 Heat(A, B) and cold(C, D) anti-fogging behavior of bare K9 substrate(A, C) and K9 substrate covered by SiO2/SiO2-TiO2 double-layer coating(B, D)

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Sol-gel Preparation of Anti-Fogging SiO₂/SiO₂-TiO₂ Double-layer Antireflective Coating ^†

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