Abstract
The recognition of broadband and high-absorption solar energy has increased interest in the application of solar energy. In the present study, we use the particle swarm optimization and the finite-difference time-domain (PSO/FDTD) algorithm to design an optimal patternless solar absorber. This absorber contains a multilayer common metal‒dielectric flat film that enables perfect absorption within the broadband solar energy spectrum. The average absorption rate of the solar energy absorber associates with the proposed inverse design method for the wavelength range of 300–2500 nm is 98.2%. The performance of the absorber is stable within the incidence angle range of 0–40°, irrespective of whether the polarization mode is transverse electric or transverse magnetic, and the absorption performance remains high at a high incidence angle of 60°. The proposed 2-inch diameter solar energy absorber can be heated to 86 °C within 100 s, indicating a heating power of 950 W m−2. The proposed absorber has a simple structure, low manufacturing cost, perfect ultra-wideband absorption that is independent of polarization, high thermal conversion performance, and substantial potential for solar energy applications.
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