Normally metallic films are required for solar energy and display related coatings. To increase the absorbing
efficiency or contrast, it is necessary to apply an antireflection coating (ARC) on the metal substrate. However, the
design of a metal substrate is very different from the design of a dielectric substrate, since the optical constant of metallic
thin film is very dependent on its thickness and microstructure. In this study, we design and fabricate ARCs on Al
substrates using SiO2 and Nb2O5 as the dielectric materials and Nb for the metal films. The ARC successfully deposited
on the Al substrate had the following structure: air/SiO2/Nb2O5/Metal/Nb2O5/Al. The measured average reflectance of
the ARC is less than 1% in the visible region. We found that it is better to use a highly refractive material than a low
refractive material. The thickness of the metallic film can be thicker with the result that it is easier to control and has a
lesser total thickness. The total thickness of the ARC is less than 200 nm. We successfully fabricated a solar absorber
and OLED device with the ARC structure were successfully fabricated.
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