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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. 
Lidorikis, Elefterios 
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.
ISSN: 0927-0248
DOI: 10.1016/j.solmat.2013.06.019
Rights: © Elsevier
Type: Article
Affiliation : University of Ioannina 
Cyprus University of Technology 
Institut Laue-Langevin 
Aristotle University of Thessaloniki 
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