Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/61322

TitleThe effect of increasing Si content in the absorber layers (CrAlSiNx /CrAlSiOyNx) of solar selective absorbers upon their selectivity and thermal stability
Author(s)Al-Rjoub, A.
Rebouta, L.
Costa, Pedro Miguel Pinto
Cunha, N. F.
Lanceros-Méndez, S.
Barradas, N. P.
Alves, E.
KeywordsOptical properties
Selective absorption
Emissivity
Solar absorptance
Issue date20-Mar-2019
PublisherElsevier B.V.
JournalApplied Surface Science
CitationApplied Surface Science 481 (2019) 1096-1102
Abstract(s)In this work, the effect of increasing Si content in the absorber layers (CrAlSiNx /CrAlSiOyNx) of solar selective absorbers upon their selectivity and thermal stability are studied. The two optical stacks presented consist of four magnetron sputtered layers on stainless steel substrates. In both cases, tungsten is used as back-reflector, CrAlSixN/CrAlSiOyNx as absorber layers with different Si/(Cr+Al+Si) atomic ratio (0.15 and 0.30, respectively) and finally the SiAlOx antireflection layer. The structures were theoretically designed by SCOUT software depended on experimental transmittance (T) and reflectance (R) of thin single layers deposited on glass substrates. It is observed that optical stack coatings with higher silicon content show better selectivity values, high solar absorptance, α= 95.9%, and low emissivity, ε= 9.7 % (calculated for 400 ºC), with higher thermal stability at 600 ºC in vacuum, for 650 h. Additionally, with the annealing at 600 ºC an increase of surface roughness was found, which was smaller for sample with higher Si content.
TypeArticle
URIhttp://hdl.handle.net/1822/61322
DOI10.1016/j.apsusc.2019.03.208
ISSN0169-4332
e-ISSN0169-4332
Publisher versionwww.elsevier.com/locate/apsusc
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)


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