Journal
OPTICS EXPRESS
Volume 21, Issue 9, Pages 11482-11491Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.011482
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Funding
- National Science Foundation under NSF [ECS-0335765]
- Army Research Office through the Institute for Soldier Nanotechnologies [W911NF-07-D000]
- MIT S3TEC Energy Research Frontier Center of the Department of Energy [DE-SC0001299]
- Austrian Science Fund (FWF) [J3161-N20]
- Austrian Science Fund (FWF) [J3161] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [J 3161] Funding Source: researchfish
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We present the results of extensive characterization of selective emitters at high temperatures, including thermal emission measurements and thermal stability testing at 1000 degrees C for 1h and 900 degrees C for up to 144h. The selective emitters were fabricated as 2D photonic crystals (PhCs) on polycrystalline tantalum (Ta), targeting large-area applications in solid-state heat-to-electricity conversion. We characterized spectral emission as a function of temperature, observing very good selectivity of the emission as compared to flat Ta, with the emission of the PhC approaching the blackbody limit below the target cut-off wavelength of 2 mu m, and a steep cut-off to low emission at longer wavelengths. In addition, we study the use of a thin, conformal layer (20 nm) of HfO2 deposited by atomic layer deposition (ALD) as a surface protective coating, and confirm experimentally that it acts as a diffusion inhibitor and thermal barrier coating, and prevents the formation of Ta carbide on the surface. Furthermore, we tested the thermal stability of the nanostructured emitters and their optical properties before and after annealing, observing no degradation even after 144h (6 days) at 900 degrees C, which demonstrates the suitability of these selective emitters for high-temperature applications. (C) 2013 Optical Society of America
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