A high-Temperature Near-Perfect Solar Selective Absorber Combining Tungsten Nanohole and Nanoshuriken Arrays

Abstract

Solar selective absorber is a key component that directly influences the photothermal efficiency in high-temperature solar energy harvesting. In present work, a solar selective absorber combining tungsten nanohole and nanoshuriken arrays was proposed and studied. Firstly, the geometry of the absorber was optimized, obtaining a near-perfect absorber. Then, evaluation of the near-perfect absorber indicated that it can achieve near unit spectral absorptance within 0.28-1.25 μm and obtain a solar absorptance of 0.9457, thus achieving a photothermal efficiency of 91.52% at 1273 K under 1000 suns. Then, analysis of its absorbing mechanisms revealed that the high solar absorptance is contributed by the impedance matching, and the coupling effects of the cavity resonance, surface plasmon polaritons, magnetic polaritons, and local surface plasmon resonance. In addition, study on the effects of the geometric parameters indicated that the absorber performance is insensitive to the changes in geometric parameters when the changes are within fabrication uncertainties. Finally, effects of the polarization angle and incident angle were examined, indicating that the near-perfect absorber exhibits high insensitivities to wide-angle incidence and all-angle polarization. These results indicate the near-perfect absorber is promising for high temperature solar energy harvesting.

Near-perfect spectrally-selective metasurface solar absorber based on tungsten octagonal prism array

“…It is known that the fabrication uncertainties of the absorber are smaller than 0.01 μm. 52 When the variations of these parameters are within the fabrication uncertainties, only the d 2 has obvious influences on the α λ , indicating that d 2 should be controlled carefully in the fabrication. However, h 6 , d 3 , and h 7 influence α λ slightly, indicating that these geometries are able to sustain relatively large fabrication uncertainties.…”

Construction and performance analysis of a solar thermophotovoltaic system targeting on the efficient utilization of AM0 space solar radiation

“… 32 According to this space distribution, it can be inferred that LSPR are excited within the nanogap under the action of incident wave with a wavelength of 2000 nm. 33 Under the effect of LSPR, the incident wave with wavelength around 2000 nm is dissipated due to ohmic dissipation, therefore leading to the selective radiation characteristic of the emitter to realize the radiation regulation of thermal radiation spectrum and achieve efficient conversion of the absorbed AM0 solar energy.

Figure 12 The |E| field and |H| field distribution in the selective emitters under incident waves with a wavelength of 2000 nm

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Multi-Scale Femtosecond-Laser Texturing for Photothermal Efficiency Enhancement on Solar Absorbers Based on TaB2 Ceramics

“…They are obtained from a significantly complex production process composed of a combination of multiple techniques (magnetron sputtering, electron beam lithography, Inductively Coupled Plasma etching, and electron beam evaporation). However, while their numerically simulated optical properties appear promising, the coating stability and durability at the foreseen temperatures, as well as the expected lifetime, are unclear [ 12 ].…”