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Near-perfect spectrally-selective metasurface solar absorber based on tungsten octagonal prism array
Mingpan Xu1, Lin Guo2, Pengfei Zhang1
1School of Energy Science and Engineering, Central South University Changsha Hunan 410083 China yu.qiu@csu.edu.cn qingli@csu.edu.cn.
RSC Advances
|June 27, 2022
Summary
This study introduces a novel metasurface absorber with an octagonal prism array for high-temperature solar thermal applications. The optimized absorber demonstrates excellent spectral selectivity, achieving high solar absorptivity and low emissivity for efficient photothermal conversion.
Area of Science:
- Materials Science
- Nanotechnology
- Renewable Energy
Background:
- Solar selective absorbers are crucial for high-temperature solar thermal applications.
- Optimizing photothermal efficiency requires materials with high solar absorptivity and low thermal emissivity.
Purpose of the Study:
- To propose, optimize, and analyze a novel metasurface absorber based on an octagonal prism array.
- To investigate the spectral selectivity and photothermal efficiency of the designed absorber for high-temperature applications.
Main Methods:
- Metasurface absorber design and structural parameter optimization.
- Analysis of spectral absorptivity, emissivity, and photothermal efficiency.
- Investigation of underlying physical mechanisms (plasmon resonance, impedance matching).
Main Results:
- Achieved near-perfect spectral selectivity with high solar absorptivity (0.9591) and low emissivity (0.1594-0.3694).
- Demonstrated high photothermal efficiency (94.72-83.10%) at 1073-1573 K under 1000 suns.
- Identified coupling of multi-plasmon resonance and impedance matching as key mechanisms for performance.
Conclusions:
- The proposed metasurface absorber exhibits excellent spectral selectivity and high photothermal efficiency.
- The design is insensitive to polarization and incident angles, making it suitable for high-temperature solar thermal devices.
- Structural parameters like excircle diameter and SiO2 height significantly influence spectral absorptivity.
