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Título

Aperiodic Metal-Dielectric Multilayers as Highly Efficient Sunlight Reflectors

AutorJiménez-Solano, Alberto CSIC ORCID; Anaya, Miguel CSIC ORCID; Calvo, Mauricio E. CSIC ORCID ; Alcon-Camas, Mercedes CSIC; Alcañiz, Carlos; Guillén, Elena; Gallas, Manuel; Preussner, Thomas; Escobar-Galindo, Ramón; Míguez, Hernán CSIC ORCID
Palabras claveMetal-dielectric ensembles
Aperiodic multilayers
Solar mirrors
Fecha de publicación2017
EditorWiley-Blackwell
CitaciónAdvanced Optical Materials 5 (2017)
ResumenThe optimum reflection of the solar spectrum at well-defined incident directions as well as its durability in time are, both, fundamental requirements of the optics of thermosolar and photovoltaic energy conversion systems. The stringent high performance needed for these applications implies that, almost exclusively, second face mirrors based on silver are employed for this purpose. Herein, the possibility to develop solar mirrors using other metals, such as copper and aluminum, is theoretically and experimentally analyzed. It is found that reflectors based on these inexpensive metals are capable of reflecting the full solar spectrum with efficiencies comparable to that of silver-based reflectors. The designs herein proposed are based on aperiodic metal-dielectric multilayers whose optimized configuration is chosen employing a code based on a genetic algorithm that allows selecting the best one among 10 tested reflectors. The use of metals with wider spectral absorption bands is compensated by the use of multilayered designs in which metal absorption is almost suppressed, as the analysis of the electric field intensity distribution demonstrates. The feasibility of the proposed mirrors is demonstrated by their actual fabrication by large area deposition techniques amenable for mass production.
URIhttp://hdl.handle.net/10261/159256
DOI10.1002/adom.201600833
Identificadoresdoi: 10.1002/adom.201600833
issn: 2195-1071
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