Abstract
A straightforward and effective spin-coating technique at 120 °C was investigated for the deposition of a thin nanoporous layer with antireflection properties onto glass and indium tin oxide (ITO) coated glass. A mixture of zeolite 3A powder and high iodine value vegetable oil was deposited, creating a carbonic paste with embedded nanoporous grains. Experimental results evidenced excellent broadband antireflection over the visible-near-infrared wavelength range (450–850 nm), with a diffuse reflectance value of 1.67% and 1.79%. Structural and optical characteristics stabilized over time. The results are promising for the accessible and cost-effective fabrication of an antireflective surface for optoelectronic devices.
Highlights
Antireflective (AR) coating fabrication is a high-interest topic, intensively investigated in industry for improving light transmission and reducing reflection
The mixture was deposited on one side of the substrate by spin-coating at 4000 rpm for 60 s, and thereafter annealed at 120 ◦C for 3 h. This resulted in a 10 μm thick layer consisting of the zeolite held together by a carbon paste obtained by the oil decomposition, which acted as a supporting matrix for the nanoporous crystals in contact with the substrate
The X-ray diffractograms indicate a high crystallinity of the samples (Figure 2)
Summary
Antireflective (AR) coating fabrication is a high-interest topic, intensively investigated in industry (e.g., solar cells) for improving light transmission and reducing reflection. Hybrid composites with improved mechanical, electrical, and optical characteristics are well-designed materials with surface roughness. They can interfere with the incident light, creating a refractive index gradient, allowing the progressive bending of light rays, which, in turn, results in improved AR characteristics [2,3,4]. Previous investigations of beta polymorph A and mordeniteframework-inverted zeolite have shown a reduction in reflected light to less than 1% in the visible spectral range [6]. Outstanding AR characteristics were obtained by properly fabricating zeolite thin film for optical lens and glass replacing the existing analogs [7,8,9]
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