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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. 
Keywords: Amorphous carbon;Effective medium approximation;Nanocomposites;Plasmonics;Solar absorption
Category: Environmental Engineering
Field: Engineering and Technology
Issue Date: 24-Jul-2013
Publisher: Elsevier
Source: Solar Energy Materials and Solar Cells, 2013, Volume 117, Pages 350-356
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: 09270248
Rights: © 2013 Elsevier B.V.
Type: Article
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