Title Advanced characterization and optical simulation for the design of solar selective coatings based on carbon: transition metal carbide nanocomposites
Authors Heras, I. , Krause, M. , Abrasonis, G. , Pardo, A. , ENDRINO ARMENTEROS, JOSÉ LUIS, Guillen, E. , Escobar-Galindo, R.
External publication Si
Means Sol. Energy Mater. Sol. Cells
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 4.78400
SJR Impact 1.59900
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-84994504725&doi=10.1016%2fj.solmat.2016.07.011&partnerID=40&md5=bca19c9cbf8f923c5252e74005125070
Publication date 01/12/2016
ISI 000384391700070
Scopus Id 2-s2.0-84994504725
DOI 10.1016/j.solmat.2016.07.011
Abstract Solar 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 similar to 5% and 15% at 25 and 600 degrees C, respectively. The results of this study can be considered as a predictive design tool for nanomaterial-based optical coatings in general. (C) 2016 Elsevier B.V. All rights reserved.
Keywords Solar selective coatings; Amorphous carbon: transition metal carbides; Effective Medium approximation; Pulsed filtered cathodic vacuum arc; Bergman representation
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