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Pattern-free solar absorber driven by superposed Fabry-Perot resonances.

Haotuo Liu1,2,3, Kun Yu4, Kaihua Zhang4

  • 1School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China. hitaiqing@hit.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|March 31, 2023
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Summary

This study introduces a cost-effective, pattern-free solar absorber using TiN-SiO2 multilayers. This novel design achieves high spectral absorption (up to 96%), enhancing solar thermal energy utilization.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Solar absorbers are crucial for converting solar irradiation into heat for various applications.
  • Traditional nanostructured absorbers often rely on complex and expensive photolithography.
  • There is a need for efficient, cost-effective solar absorber designs.

Purpose of the Study:

  • To propose and analyze a pattern-free, TiN-SiO2-based multilayer solar absorber.
  • To investigate the spectral absorption performance and underlying physical mechanisms.
  • To explore the influence of structural parameters and incidence angle on absorber efficiency.

Main Methods:

  • Numerical simulations were employed to model the TiN-SiO2 multilayer structure.
  • Analysis of spectral absorption, electric field, and power dissipation density distributions.
  • Systematic investigation of geometric parameters, material properties, and incidence angles.

Main Results:

  • A 3-cell multilayer structure achieved a maximum average spectral absorption of 93.5% (0.3-2.5 μm).
  • The absorption mechanism involves coupled Fabry-Perot (FP) resonances and TiN intrinsic absorption.
  • High absorption (>80%) was maintained even at a 60° incidence angle.
  • A 6-cell structure demonstrated an average spectral absorption of 96%.

Conclusions:

  • The pattern-free TiN-SiO2 multilayer absorber offers a cost-effective and efficient solution for solar energy utilization.
  • The study deepens the understanding of FP resonance in multilayer structures for solar absorption.
  • This work presents a novel pathway for developing advanced solar thermal energy systems.