Reflectance spectrum calculations for a silicon oxynitride (SiO x N y )-porous silicon (PS) double layer antireflection coating is performed using the matrix method. The results are compared with the corresponding spectrum of diamond-like carbon (DLC)/PS and SiO 2 /TiO 2 double layer coatings. A lower reflectance in the visible and infrared regions of the solar spectrum for the SiO x N y /PS double layer is obtained, especially in the 450-600 nm spectral range (with a flat reflectance response remaining as low as ≈ 0.01%), which corresponds to the maximum intensity of solar irradiation. These findings are of importance in solar cell applications.
Reflectance calculations for diamond-like carbon (DLC) antireflection thin-film coatings on porous silicon (PS) have been carried out using the optical matrix approach method. Comparison with the reflectance spectrum obtained for other antireflection coatings shows a much lower reflectance with a larger energy range including the ultraviolet, visible and infrared regions of the solar spectrum for the DLC/PS double layer. This finding is relevant in solar cell applications.
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