Journal
PLASMONICS
Volume 10, Issue 3, Pages 529-538Publisher
SPRINGER
DOI: 10.1007/s11468-014-9837-6
Keywords
Solar energy; Plasmonics; Metamaterial; Thermal emission
Funding
- National Natural Science Foundation of China [61307078, 91233208, 91233119]
- National High Technology Research and Development Program (863) of China [2012AA030402, 2013AA014401]
- Zhejiang Provincial Key Project [2011C11024]
- Specialized Research Fund for the Doctoral Program of Higher Education
- Fundamental Research Funds for the Central Universities
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We propose a high-efficiency plasmonic metamaterial selective emitter based on a tungsten (W) spherical core-shell nanostructure for potential applications in planar solar thermophotovoltaics. This structure consists of silicon dioxide (SiO2)-coated W nanospheres periodically distributed on a W substrate and a thin W layer deposited on top. Using a new definition of spectral efficiency, numerical optimization is performed and its optical behaviors are systematically investigated. The numerical results show that our selective emitter has a high emissivity in the short wavelength range below the wavelength corresponding to the bandgap of the back photovoltaic cell and a low emissivity in the long wavelength range beyond it. Its spectral efficiency of 0.39 is much higher than those of other cases without the top W cover layer or the W nanospheres. Such excellent emission selectivity is attributed to the strong photonic interaction within the gaps between the adjacent core-shell nanospheres, the tightly confined optical fields in both the Omega-shaped W-SiO2-W nanocavities, and the bottom nanocavities formed by the W nanospheres and the W substrate. It is also very tolerant toward the thicknesses of the SiO2 layer and the top W cover layer.
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