Metamaterial emitter for thermophotovoltaics stable up to 1400 °C.

Sci Rep 2019 May 10;9(1):7241. Epub 2019 May 10.

Institute of Optical and Electronic Materials, Hamburg University of Technology, Eissendorfer Strasse 38, Hamburg, 21073, Germany.

High temperature stable selective emitters can significantly increase efficiency and radiative power in thermophotovoltaic (TPV) systems. However, optical properties of structured emitters reported so far degrade at temperatures approaching 1200?°C due to various degradation mechanisms. We have realized a 1D structured emitter based on a sputtered W-HfO layered metamaterial and demonstrated desired band edge spectral properties at 1400?°C. To the best of our knowledge the temperature of 1400?°C is the highest reported for a structured emitter, so far. The spatial confinement and absence of edges stabilizes the W-HfO multilayer system to temperatures unprecedented for other nanoscaled W-structures. Only when this confinement is broken W starts to show the well-known self-diffusion behavior transforming to spherical shaped W-islands. We further show that the oxidation of W by atmospheric oxygen could be prevented by reducing the vacuum pressure below 10?mbar. When oxidation is mitigated we observe that the 20?nm spatially confined W films survive temperatures up to 1400?°C. The demonstrated thermal stability is limited by grain growth in HfO, which leads to a rupture of the W-layers, thus, to a degradation of the multilayer system at 1450?°C.

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http://dx.doi.org/10.1038/s41598-019-43640-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6510906PMC
May 2019
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