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Analysis of High-Efficiency Mo-Based Solar Selective Absorber by Admittance Locus Method

1
Department of Optics and Photonics/Thin Film Technology Center, National Central University, 300, Chung Da Rd., Chung Li, Taoyuan 32001, Taiwan
2
Instrument Technology Research Center, National Applied Research Laboratories, No. 20. R&D Rd. VI, Hsinchu Science Park, Hsinchu 30076, Taiwan
3
Optical Sciences Center/Thin Film Technology Center, National Central University, 300, Chung Da Rd., Chung Li, Taoyuan 32001, Taiwan
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(4), 256; https://doi.org/10.3390/coatings9040256
Received: 28 February 2019 / Revised: 10 April 2019 / Accepted: 13 April 2019 / Published: 17 April 2019
(This article belongs to the Special Issue Design, Manufacturing and Measurement of Optical Film Coatings)
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Abstract

High absorptivity and low emissivity are characteristics needed in an ideal solar selective absorber. In high-temperature applications, such as a solar concentration power system in which the solar surface works under a long-term high temperature (about 400 to 800 °C), the absorber material has to maintain high absorption in the visible region, high reflectance in the infrared region, and excellent thermal stability at high temperature. In this research, the design of a molybdenum-based (Mo-based) solar selective absorber was analyzed by the admittance locus method, and the films were deposited by magnetron sputtering. The ratio of the extinction coefficient to the refractive index of the Mo layer was close to 1, so that the Mo-based solar selective absorber had a broad absorption band, high absorption, and good solar selectivity. Its average reflectance in the visible region was less than 0.4%. The experimental absorption was 97.1% (simulated absorption was 98%) and the emissivity was from 13% to 20% (simulated emissivity was 8% to 26%) as the temperature increased from 400 to 800 °C. View Full-Text
Keywords: solar selective absorber; solar concentration power system; admittance locus method; molybdenum; absorption; emissivity solar selective absorber; solar concentration power system; admittance locus method; molybdenum; absorption; emissivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chen, H.-P.; Lee, C.-T.; Liao, W.-B.; Chang, Y.-C.; Chen, Y.-S.; Li, M.-C.; Lee, C.-C.; Kuo, C.-C. Analysis of High-Efficiency Mo-Based Solar Selective Absorber by Admittance Locus Method. Coatings 2019, 9, 256.

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