Advanced characterization and optical simulation for the design of solar selective coatings based on carbon: transition metal carbide nanocomposites

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dc.contributor.authorHeras, I.
dc.contributor.authorKrause, M.
dc.contributor.authorAbrasonis, G.
dc.contributor.authorPardo, A.
dc.contributor.authorEndrino, José L.
dc.contributor.authorGuillen, E.
dc.contributor.authorEscobar-Galindo, R.
dc.date.accessioned2016-08-10T11:30:26Z
dc.date.available2016-08-10T11:30:26Z
dc.date.issued2016-07-30
dc.description.abstractSolar selective coatings based on carbon transition metal carbide nanocomposite absorber layers were designed. Pulsed filtered cathodic arc was used for depositing amorphous carbon:metal carbide (a-C:MeC, Me = V, Mo) thin films. Composition and structure of the samples were characterized by ion beam analysis, X-ray diffraction, Raman spectroscopy, and transmission electron microscopy. The optical properties were determined by ellipsometry and spectrophotometry. Three effective medium approximations (EMA), namely Maxwell-Garnett, Bruggeman, and Bergman, were applied to simulate the optical behaviour of the nanocomposite thin films. Excellent agreement was achieved between simulated and measured reflectance spectra in the entire wavelength range by using the Bergman approach, where in-depth knowledge of the nanocomposite thin film microstructure is included. The reflectance is shown to be a function of the metal carbide volume fraction and its degree of percolation, but not dependent on whether the nanocomposite microstructure is homogeneous or a self-organized multilayer. Solar selective coatings based on an optimized a-C:MeC absorber layer were designed exhibiting a maximum solar absorptance of 96% and a low thermal emittance of ~5% and 15% at 25 and 600 °C, respectively. The results of this study can be considered as a predictive design tool for nanomaterial-based optical coatings in general.en_UK
dc.identifier.citationI. Heras, M. Krause, G. Abrasonis, A. Pardo, J.L. Endrino, E. Guillén, R. Escobar-Galindo, Advanced characterization and optical simulation for the design of solar selective coatings based on carbon: transition metal carbide nanocomposites, Solar Energy Materials and Solar Cells, Volume 157, December 2016, Pages 580-590en_UK
dc.identifier.issn0927-0248
dc.identifier.urihttp://dx.doi.org/10.1016/j.solmat.2016.07.011.
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/10266
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectSolar selective coatingsen_UK
dc.subjectAmorphous carbonen_UK
dc.subjectTransition metal carbidesen_UK
dc.subjectEffective Medium approximationen_UK
dc.subjectPulsed filtered cathodic vacuum arcen_UK
dc.subjectBergman representationen_UK
dc.titleAdvanced characterization and optical simulation for the design of solar selective coatings based on carbon: transition metal carbide nanocompositesen_UK
dc.typeArticleen_UK

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