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Ultrathin nanostructured solar selective absorber based on a two-dimensional hemispherical shell array
KTH, School of Electrical Engineering (EES). KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.ORCID iD: 0000-0002-3401-1125
2018 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 112, no 6, article id 063903Article in journal (Refereed) Published
Abstract [en]

A distinctive ultrathin nanostructured solar selective absorber is demonstrated experimentally. It consists of a self-assembled, two-dimensional, closely packed hexagonally distributed tungsten hemispherical shell array coated with an ultrathin germanium film (20 nm in thickness) and a silicon dioxide antireflective film. Due to the combined light trapping effects of unconventional interferences within the germanium film and the excited surface plasmon polaritons at the tungsten-germanium interface, as well as the antireflection effect of the silicon dioxide layer, the solar absorption of this absorber (0.93) is about as high as that of commercial black paint (0.94) and much higher than that of its planar counterpart (0.83). With greatly suppressed emission/absorption in the long wavelength range, its heat accumulation is superior, enabling a much higher temperature (218 °C under 7-sun illumination) than its planar counterpart and the black paint absorber (203 °C and 181 °C under 7-sun illumination, respectively). 

Place, publisher, year, edition, pages
American Institute of Physics Inc. , 2018. Vol. 112, no 6, article id 063903
Keywords [en]
Electromagnetic wave polarization, Germanium, Interfaces (materials), Paint, Silica, Tungsten, Anti-reflection effects, Antireflective films, Heat accumulation, Hemispherical shells, Light trapping effects, Long-wavelength-range, Silicon dioxide layers, Surface plasmon polaritons, Solar absorbers
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-227441DOI: 10.1063/1.5017574ISI: 000424703200043Scopus ID: 2-s2.0-85041746641OAI: oai:DiVA.org:kth-227441DiVA, id: diva2:1210401
Note

Export Date: 9 May 2018; Article; CODEN: APPLA; Funding details: 2017YFA0205700, NRPB, National Research Program for Biopharmaceuticals; Funding details: 11621101, NSFC, National Natural Science Foundation of China; Funding details: 61775195, NSFC, National Natural Science Foundation of China; Funding details: 2017FZA5001, FOM, Foundation for Fundamental Research on Matter; Funding text: This work was supported by the National Key Research and Development Program of China (No. 2017YFA0205700), the National Natural Science Foundation of China (Nos. 61775195 and 11621101), and the Fundamental Research Funds for the Central Universities (No. 2017FZA5001). QC 20180528

Available from: 2018-05-28 Created: 2018-05-28 Last updated: 2018-05-28Bibliographically approved

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He, Sailing

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