Modulation of the cutoff wavelength in the spectra for solar selective absorbing coating based on high-entropy films
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第10期
论文作者：Ping Song Cong Wang Jie Ren Ying Sun Yong Zhang Angélique Bousquet Eric Tomasella
文章页码：1371 - 1378
摘 要：This paper demonstrates an intrinsic modulation of the cutoff wavelength in the spectra for solar selective absorbing coating based on high-entropy films. The（NiCuCrFeSi）N（（NCCFS）N） films were deposited by a magnetron sputtering system. Rutherford backscattering spectroscopy analysis confirms the uniform composition and good homogeneity of these high-entropy films. The real and imaginary parts of the permittivity for the（NCCFS）N material are calculated on the basis of the reflectance spectral fitting results. A redshift cutoff wavelength of the reflectance spectrum with increasing nitrogen gas flow rate exists because of the different levels of dispersion when changing nitrogen content. To realize significant solar absorption, the film surface was reconstituted to match its impedance with air by designing a pyramid nanostructure metasurface. Compared with the absorptance of the as-deposited films, the designed metasurface obtains a significant improvement in solar absorption with the absorptance increasing from 0.74 to 0.99. The metasurfaces also show low mid-infrared emissions with thermal emittance that can be as low as 0.06. These results demonstrate a new idea in the design of solar selective absorbing surface with controllable absorptance and low infrared emission for high-efficiency photo-thermal conversion.
Ping Song1,2，Cong Wang1，Jie Ren1，Ying Sun1，Yong Zhang3，Angélique Bousquet4，Eric Tomasella4
1. Center for Condensed Matter and Material Physics, Beihang University2. Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University3. Beijing Advanced Innovation Center of Materials Genome Engineering, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing4. Université Clermont Auvergne, Centre national de la recherche scientifique (CNRS), SIGMA Clermont, Institut de Chimie de Clermont-Ferrand (ICCF)
摘 要：This paper demonstrates an intrinsic modulation of the cutoff wavelength in the spectra for solar selective absorbing coating based on high-entropy films. The（NiCuCrFeSi）N（（NCCFS）N） films were deposited by a magnetron sputtering system. Rutherford backscattering spectroscopy analysis confirms the uniform composition and good homogeneity of these high-entropy films. The real and imaginary parts of the permittivity for the（NCCFS）N material are calculated on the basis of the reflectance spectral fitting results. A redshift cutoff wavelength of the reflectance spectrum with increasing nitrogen gas flow rate exists because of the different levels of dispersion when changing nitrogen content. To realize significant solar absorption, the film surface was reconstituted to match its impedance with air by designing a pyramid nanostructure metasurface. Compared with the absorptance of the as-deposited films, the designed metasurface obtains a significant improvement in solar absorption with the absorptance increasing from 0.74 to 0.99. The metasurfaces also show low mid-infrared emissions with thermal emittance that can be as low as 0.06. These results demonstrate a new idea in the design of solar selective absorbing surface with controllable absorptance and low infrared emission for high-efficiency photo-thermal conversion.
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