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Proceedings Paper

Design of selective coatings for solar thermal applications using sub-wavelength metal-dielectric structures
Author(s): Nicholas P. Sergeant; Mukul Agrawal; Peter Peumans
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Paper 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.

Paper Details

Date Published: 20 August 2009
PDF: 10 pages
Proc. SPIE 7410, Optical Modeling and Measurements for Solar Energy Systems III, 74100C (20 August 2009); doi: 10.1117/12.826803
Show Author Affiliations
Nicholas P. Sergeant, Stanford Univ. (United States)
Mukul Agrawal, Stanford Univ. (United States)
Peter Peumans, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 7410:
Optical Modeling and Measurements for Solar Energy Systems III
Benjamin K. Tsai, Editor(s)

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