In this paper, we introduce an entirely new solar absorber design—a multi-layer periodic stacked structure. Through coupling effects, this design has perfect ultra-wideband absorption characteristics. The absorber structure is composed of four absorption units with varying cycle lengths, which are cyclically stacked on the surface of the refractory metal Cr. Each cycle encompasses three-layer nanosheets of Ti–SiO₂–GaAs. We verify through finite difference time domain method (FDTD) simulations that the absorber achieves an absorption efficiency of 97.8% within the wavelength range of 280 nm to 3000 nm, with an average efficiency of 96.6% under the AM1.5 standard solar spectrum. The absorber can achieve such a remarkable absorption effect because of surface plasmon resonance (SPR) and Fabry–Pérot resonance effects. At 1500 K, this structure exhibits a thermal radiation efficiency of up to 97.83%. Furthermore, the design is not affected by polarization and it is less affected by the incident angle of the light source. These absorption spectra remain consistent regardless of whether it is in the TE or TM mode. Even when the angle of incidence is increased to 60 degrees, the absorption efficiency remains high. Its unique structure and excellent performance characteristics provide higher solar energy efficiency. These outstanding features enable solar absorbers to have broad application potential in improving solar energy efficiency.

中文翻译：

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具有 Ti-SiO2-GaAs 多层堆叠结构的完美超宽带太阳能吸收器：结构和突出特性


在本文中，我们介绍了一种全新的太阳能吸收器设计——多层周期性堆叠结构。通过耦合效应，这种设计具有完美的超宽带吸收特性。吸收器结构由四个具有不同循环长度的吸收单元组成，它们循环堆叠在难熔金属 Cr 的表面上。每个循环都包含 Ti-SiO 2-GaAs 的三层纳米片。我们通过有限差分时域法 （FDTD） 仿真验证，该吸收体在 280 nm 至 3000 nm 波长范围内实现了 97.8% 的吸收效率，在 AM1.5 标准太阳光谱下的平均吸收效率为 96.6%。由于表面等离子体共振 （SPR） 和法布里-佩罗共振效应，吸收器可以达到如此显着的吸收效果。在 1500 K 时，这种结构表现出高达 97.83% 的热辐射效率。此外，该设计不受偏振的影响，受光源入射角的影响较小。这些吸收光谱无论处于 TE 还是 TM 模式，都保持一致。即使将入射角增加到 60 度，吸收效率仍然很高。其独特的结构和优异的性能特点提供了更高的太阳能效率。这些出色的特性使太阳能吸收器在提高太阳能效率方面具有广泛的应用潜力。