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Spectrally selective absorber coating of WAlN/WAlON/Al2O3 for solar thermal applications

Dan, Atasi and Jyothi, J and Chattopadhyay, Kamanio and Barshilia, Harish C and Basu, Bikramjit (2016) Spectrally selective absorber coating of WAlN/WAlON/Al2O3 for solar thermal applications. In: SOLAR ENERGY MATERIALS AND SOLAR CELLS, 157 . pp. 716-726.

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Official URL: http://dx.doi.org/10.1016/j.solmat.2016.07.018

Abstract

A novel WAlN/WAlON/Al2O3 coating was successfully deposited on stainless steel (SS) substrate using reactive DC and RF magnetron sputtering. Excellent spectrally selective property with a high absorptance of 0.958 in the solar spectrum region and low emittance of 0.08 in the infrared region were achieved by tailoring the target power, deposition time and the reactive flow rates of N-2 and O-2. In the present solar selective coating, W layer acts as a back reflector and diffusion barrier, WAlN as the main absorber layer, WAlON as the semi-absorber layer, whereas the topmost Al2O3 layer works as an anti-reflecting layer. In reference to the thermal stability, the absorber deposited on SS substrates exhibited high solar selectivity (alpha/epsilon) of 0.920/0.11, when heat treated in air up to 500 degrees C for 2 hrs. Taken together, the present study demonstrated that the WAlN/WAlON/Al2O3-based selective absorbing coating with excellent thermal stability could be a promising material for photo-thermal conversion at temperatures of up to 500 degrees C. (C) 2016 Elsevier B.V. All rights reserved.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
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Date Deposited: 03 Dec 2016 04:53
Last Modified: 03 Dec 2016 04:53
URI: http://eprints.iisc.ernet.in/id/eprint/55212

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