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|Title:||Broadband optical absorption of amorphous carbon/Ag nanocomposite films and its potential for solar harvesting applications||Authors:||Zoubos, H.
Koutsokeras, Loukas E.
Anagnostopoulos, Dimitrios F.
Kalogirou, Soteris A.
Wildes, Andrew R.
Kelires, Pantelis C.
Patsalas, Panos A.
|Major Field of Science:||Engineering and Technology||Field Category:||Environmental Engineering||Keywords:||Amorphous carbon;Effective medium approximation;Nanocomposites;Plasmonics;Solar absorption||Issue Date:||24-Jul-2013||Source:||Solar Energy Materials and Solar Cells, 2013, vol. 117, pp. 350-356||Volume:||117||Start page:||350||End page:||356||Journal:||Solar Energy Materials and Solar Cells||Abstract:||The emergence of Localized Surface Plasmon Resonance (LSPR) in nanocomposite films consisting of a hydrogen-free amorphous Carbon (a-C) matrix and Ag is considered theoretically and experimentally. While in theory it could be manifested for highly tetrahedral (>90% sp3) matrices, Auger electron spectroscopy and neutron reflectivity have shown that the incorporation of Ag into the a-C matrix induces severe graphitization that eliminates the LSPR; nonetheless, the dielectric damping of graphitized a-C, in combination with the π-π* electronic transitions of carbon and the defect states introduced by Ag, cumulatively result in a strong broadband optical absorption in the near infrared, visible and UVA/UVB spectral ranges, revealed by optical reflectivity spectra, that coincides with the solar emission spectrum. The incorporation of Ag into a-C at room temperature thus proves to be an energy-efficient pathway for the controlled graphitization and the tailored optical absorption of novel nanocomposite films for solar photothermal applications.||URI:||https://hdl.handle.net/20.500.14279/9829||ISSN:||0927-0248||DOI:||10.1016/j.solmat.2013.06.019||Rights:||© Elsevier||Type:||Article||Affiliation :||University of Ioannina
Cyprus University of Technology
Aristotle University of Thessaloniki
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