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Solution-Processed All-Ceramic Plasmonic Metamaterials for Efficient Solar-Thermal Conversion over 100-727 °C.

Yang Li1, Chongjia Lin1, Zuoxu Wu2

  • 1Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China.

Advanced Materials (Deerfield Beach, Fla.)
|November 26, 2020
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Summary

A new, low-cost titanium nitride (TiN) selective absorber efficiently captures solar energy across a wide temperature range. This advanced material offers high absorption and low emission, making it ideal for diverse solar-thermal applications.

Keywords:
photothermal absorbersplasmonic metamaterialsselective absorberssolar-thermal conversionsolution processes

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Selective solar absorbers are crucial for efficient solar-thermal energy conversion.
  • Existing absorbers often lack the spectral selectivity or thermal stability for wide-temperature applications.
  • High-performance absorbers are typically expensive due to complex fabrication methods.

Purpose of the Study:

  • To develop a low-cost, large-area solar-thermal absorber with superior spectral selectivity and thermal stability.
  • To enable efficient solar-thermal conversion for both low- (<200°C) and high-temperature (>600°C) applications.
  • To overcome limitations of current selective absorbers in terms of performance and cost.

Main Methods:

  • Fabrication of an ultrathin titanium nitride (TiN) nanoparticle film on a TiN mirror using facile solution-based processes.
  • Utilizing synergetic in-plane plasmon and out-of-plane Fabry-Pérot resonances in the all-ceramic plasmonic metamaterial.
  • Characterization of spectral selectivity, thermal stability, and solar absorption efficiency.

Main Results:

  • Achieved high, full-spectrum solar absorption (95%) and low mid-infrared emission (3% at 100°C).
  • Demonstrated excellent thermal stability over a wide temperature range (100-727°C).
  • The solution-processed absorber exhibits competitive performance and significant cost reduction compared to vacuum-deposited alternatives.

Conclusions:

  • The developed all-ceramic plasmonic metamaterial selective absorber offers a cost-effective, universal solution for solar-thermal applications.
  • High efficiency (89-93%) is achieved for both low- and high-temperature applications.
  • This technology paves the way for large-scale, efficient solar-thermal energy utilization.