Abstract
CrN and CrON films exhibit excellent chemical and thermal stabilities at high-temperature applications. Spectrally selective CrN(H)/CrN(L)/CrON/AlO tandem absorbers were deposited on stainless steel (SS) substrates by reactive magnetron sputtering for high-temperature solar performance. The refractive indexes of the CrN(H), CrN(L), CrON and AlO films were obtained by using an ellipseometer. The chemical composition and structure of the studied films were characterized using field-emission scanning electron microscopy, transmission electron microscopy, energy-dispersive x-ray spectrometry, and grazing-incidence x-ray diffraction. The ultraviolet/visible/near-infrared and fourier-transform infrared spectrophotometers were used to measure the optical properties of SS/CrN(H)/CrN(L)/CrON/AlO tandem absorbers. The effect of the thickness of stacking films on the optical properties and the high-temperature thermal stability of SS/CrN(H)/CrN(L)/CrON/AlO tandem absorbers were investigated. Experimental results show that the optimal SS/CrN(H)/CrN(L)/CrON/AlO tandem absorber displays a high absorptivity (α) of 0.935 and a low emissivity (e) of 0.03. The optical properties of this absorber was stable (α/e = 0.920/0.01) after heating at 400°C in air for 216 h, indicating that the SS/CrN(H)/CrN(L)/CrON/AlO tandem absorber exhibited superior thermal stability.
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