Abstract
A perfect spectrally selective solar absorber based on dielectric filled fishnet-shape tungsten grating has been proposed and numerically investigated. The designed structure achieves a total solar absorption efficiency higher than 94% and a total emittance less than 5% at 100 °C, resulting in a total photothermal conversion efficiency of 93.4% irradiated by one sun. In addition, the proposed selective solar absorber exhibits nearly perfect absorption in visible and near-infrared regions (400–1200 nm), and the underlying physical mechanisms for the excellent performance including the impedance matching with surrounding medium, surface plasmon resonances, and cavity resonances are elucidated in detail. Furthermore, effects of the proposed solar absorber geometric parameters on the absorption properties of it are also analyzed. Moreover, the solar absorber exhibits angular independence up to 60° and polarization insensitivity. The proposed spectrally selective solar absorber promises potentially valuable applications for thermophotovoltaic conversion, thermal emitters, solar energy harvesting, and so on.
| Original language | English |
|---|---|
| Article number | 110664 |
| Journal | Solar Energy Materials and Solar Cells |
| Volume | 215 |
| DOIs | |
| State | Published - 15 Sep 2020 |
| Externally published | Yes |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 7 Affordable and Clean Energy
Keywords
- Cavity resonance
- Impedance match
- Perfect absorption
- Solar energy
- Surface plasmon resonances
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