Abstract
Successful deployment of large scale concentrating solar power (CSP) systems require spectrally selective absorber coatings with high absorptance and low emittance characteristics in the visible and infrared regions of solar spectrum respectively. In this paper, we synthesize and study the properties of Ti/AlN/Ti multilayer selective absorber coating deposited on Fe3O4 layered stainless steel (SS) substrate using direct current/radiofrequency (DC/RF) magnetron sputtering. Simple annealing process was used to create a layer of Fe3O4 on SS substrate. Several characterizations tools such as XRD, UV–Vis-NIR, FESEM, AFM and FTIR were employed. High solar absorptance of 0.89 and low thermal emittance of 0.19 were achieved. This high absorptance value is attributed to multiple reflections of the incident light, induced by interference mechanism and surface roughness of the coating caused by high deposition rate of Ti and the formation rough oxide layer of Fe3O4 as a result of annealing the substrate prior to deposition.
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