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- A new material ZrOxlZr/ ZrOxl AlxOy multilayered selective solar absorber was fabricated using electron-beam vacuum evaporation onto stainless steel (SS), microscope glass slides and silicon (Si). The optical constants n and k were measured using ellipsometry spectroscopy. A calculation using Cauchy's model reveals that the properties of a Zr layer of thickness 5 nm were shown to undergo a metallic behaviour. Calculation for the properties of both ZrOx layers of 50 run and 70 nm using Adachi model predicts a transition between dielectric and metallic behaviour. The properties of the AlxOy antireflection layer (AR) were also calculated using the Adachi model and were shown to undergo a dielectric behaviour. The multilayer stack (ZrOx/Zr/ ZrOxl AlxOy) was characterized using X-ray diffraction (XRD) and result show that the coating has a face-centered cubic (FCC) phase of Zr02, whereas AlxOy was amorphous. The obtained data agrees well with results obtained using Raman spectroscopy. The morphology, microstructural, was measured using Atomic Force Microscopy (AFM), and Scanning Electron Microscopy (SEM). The optical properties were measured using UV -vis-NIR spectroscopy at wavelength ranges from 300 nm 2500 nm and Ff -IR spectroscopy at wavelength ranges from 4000 nm - 25000 nm. The coating exhibits high normal solar absorbance of 0.93 in the solar spectrum region and low normal thermal emittance of 0.11 in the infrared region. However, the obtained films can be used for solar-thermal applications at low- and mid-operating temperature.
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