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Central receiver coatings for high-temperature concentrated solar power studied by in situ RBS, Raman spectroscopy and spectroscopic ellipsometry

Lungwitz, F.; Heras, I.; Janke, D.; Wenisch, R.; Schumann, E.; Guillén Rodriguez, E.; Escobar Galindo, R.; Gemming, S.; Krause, M.

The development of solar-selective CSP receiver coatings with high-temperature and environmental stability requires new concepts of design and in operando monitoring. Solar receiver tubes are a key component of solar thermal power plants. The increase of their operation temperature from today’s maximum of 550°C to about 800°C could increase the CSP efficiency by approximately 15 to 20% and improve the competiveness of this technology compared to other ones of carbon-free electricity generation. Potential alternatives to fast degrading state-of-the-art pigment paint receiver tube coatings are based on refractive metal carbides, nitrides, and oxides because of their high thermal stability and oxidation resistance.
New types of solar-selective coatings were studied in situ at temperatures of up to 830°C by Rutherford backscattering spectrometry, Raman spectroscopy, and spectroscopic ellipsometry within a cluster tool. High-temperature stability in high-vacuum is demonstrated for carbon-metal- and oxynitride-absorber-based multilayers as well as for a solar-selective transmitter based on a transparent conductive oxide.
Financial support by the EU, grant No. 645725, project FRIENDS2, and the HGF via the W3 program (S.G.) is gratefully acknowledged.

Keywords: Solar selective coatings; Oxynitrides; Thermosolar energy; Optical simulation; in situ analysis

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Permalink: https://www.hzdr.de/publications/Publ-26738
Publ.-Id: 26738