20 August 2009 Design of selective coatings for solar thermal applications using sub-wavelength metal-dielectric structures
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Abstract
Spectral control of the emissivity of surfaces is essential in applications such as solar thermal energy and thermophotovoltaic energy conversion in order to achieve the highest conversion efficiencies possible. We investigated surfaces consisting of periodic, nanoscale V-grooves coated with aperiodic metal-dielectric stacks. This approach combines impedance matching using tapered metallic features with the excellent spectral selectivity of aperiodic metal-dielectric stacks. We explain how changes in the angle of the V-grooves can be used to tailor the spectral selectivity over a wide angular range to significantly increase the efficiency of thermophotovoltaic and solar thermal systems. Optimal coatings for concentrated solar power are predicted to have thermal emissivity below 5% at 450°C while absorbing >90% of the incident light.
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Nicholas P. Sergeant, Nicholas P. Sergeant, Mukul Agrawal, Mukul Agrawal, Peter Peumans, Peter Peumans, } "Design of selective coatings for solar thermal applications using sub-wavelength metal-dielectric structures", Proc. SPIE 7410, Optical Modeling and Measurements for Solar Energy Systems III, 74100C (20 August 2009); doi: 10.1117/12.826803; https://doi.org/10.1117/12.826803
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