Abstract
A study of spectrally selective surfaces based on anodic oxide films on titanium is presented. These surfaces have low values of solar absorptance, ≈ 0.77, due to the non-ideal optical properties of the anodic TiO 2 for antireflection of titanium. A simple chemical etching process is described which gives a textured surface with dimensions similar to the wavelengths of solar radiation, leading to spectral selectivity. The performance of this dark etched surface can be further improved by anodising and optimum absorbers have been produced with α s = 0.935 and ϵ th (400 K) = 0.23 . The surface texturing effects a significant improvement in α s at oblique incidence.
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