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- W2899694730 abstract "We propose solar selective absorbers with β-FeSi2−containing SiO2 composites on low-emissivity Mo base layers for high temperature receiver tubes. The stacking structure of the multilayer was designed based on the optical constants of the β-FeSi2+SiO2 composites, and the optical absorptance spectra of the fabricated absorbers were obtained to investigate the solar–thermal conversion efficiency. Because the composite with a high volume fraction of the semiconducting β-FeSi2 showed a high extinction coefficient k only in the solar spectrum region, the interband absorption provided a desirable selective absorbing behaviour with a steep transition curve from high solar absorption to low infrared absorption in the near-infrared region. Adjusting the β-FeSi2 content in the SiO2 matrices was effective to control the optical constant spectra, which was useful for a gradual decline of refractive index n towards the surface. The interface between the β-FeSi2 and Mo base layer had low thermal stability because of Si diffusion, thus a thin SiO2 barrier was inserted at the interlayer to suppress the interaction. The optical absorption spectrum of the designed and prepared absorber “SiO2/β-FeSi2+SiO2 composites/SiO2 barrier/Mo base” achieved high photo-thermal conversion efficiencies of over 72.1 % at high temperatures below 700 °C. The β-FeSi2 nanoparticles dispersed in the SiO2 matrices were stable even after annealing at 750 °C for 1 h, and the fabricated multilayer showed good thermal stability at 600 °C for 500 h." @default.
- W2899694730 created "2018-11-16" @default.
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- W2899694730 date "2018-01-01" @default.
- W2899694730 modified "2023-10-14" @default.
- W2899694730 title "Solar selective absorbers based on semiconducting β-FeSi2 for high temperature solar-thermal conversion" @default.
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- W2899694730 doi "https://doi.org/10.1063/1.5067227" @default.
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