The high reflectivity of Au gives rise to a significant decrease in the absorption of solar energy, and the solar energy absorber using Ti as filling materials has optimal performance. Overall, titanium is the most suitable material in this structure. Moreover, the material nanosphere was varied to study its effect.
Now researchers at MIT say they have accomplished the development of a material that comes very close to the “ideal” for solar absorption. The material is a two-dimensional metallic dielectric photonic crystal, and has the additional benefits of absorbing sunlight from a wide range of angles and withstanding extremely high temperatures.
Therefore, from the ideal solar-thermal absorber design point of view, selective and almost total absorption across the entire solar spectrum, flexible tunability of the cut-off wavelength, and minimized excessive energy dissipation by thermal radiation in the near-IR (NIR) to mid-IR range are the essential factors.
Solar absorbers play a very important part in the solar energy utilization system. The concentrator concentrates scattered sunlight onto the absorber, causing the surface to concentrate a hundred times more energy than the sun normally shines on it.
Therefore, solar energy absorbers should possess a high absorption rate to visible and near-infrared light. However, when the solar energy absorber of Case 1 and Case 2 is put under the AM 1.5 solar spectrum, they lose much energy of the visible and near-infrared light.
Combined with Figs. 4 and 5, the apparent stationary waves within the TiN structure, which is a typical feature of guided mode resonance (GMR) that indicates that the reason for the strong absorption of the solar absorber at 395 nm is due to the coupling of the SPR and the GMR [ 36 ].
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