Ultra High Efficiency Solar Capture Device Based on InAs Nanoring Microstructure

As a widely used clean energy source, solar energy has demonstrated significant promise across various applications due to its wide spectral range and efficient absorption performance. This study introduces a cross-structured, ultra-broadband solar absorber utilizing titanium (Ti) and titanium dioxide (TiO2) as its foundational materials. The absorber exhibits over 90% absorption within the 280–4000 nm wavelength range and surpasses 95% absorption in the broader spectrum from 542 to 3833 nm through the cavity coupling effect of incident light excitation and the subsequent initiation of the surface plasmon resonance mechanism, thus successfully achieving the goal of broadband high absorption. Through the finite difference time domain method (FDTD) simulation, the average absorption efficiency reaches 97.38% within the range from 280 nm to 4000 nm, and it is 97.75% in the range from 542 nm to 3833 nm. At the air mass of 1.5 (AM 1.5), the average absorption efficiency of solar energy is 97.46%, and the loss of solar energy is 2.54%, which has extremely high absorption efficiency. In addition, thanks to the material considerations, the absorber adopts a variety of high-temperature resistant materials, making the thermal radiation efficiency in a high-temperature environment still good; specifically, at the temperature of 900 K, its thermal radiation efficiency can reach 97.27%, and at the extreme 1800 K temperature, it can still maintain 97.52% of high efficiency thermal radiation, further highlighting its excellent thermal stability and comprehensive performance. The structure exhibits excellent optical absorption and thermal radiation properties, which give it broad applicability as an ideal absorber or thermal emitter. More importantly, the absorber is insensitive to the polarization state of the light and can effectively handle the incident light lines in the wide-angle range. In addition, its photothermal conversion efficiency (Hereafter referred to as pc efficiency) can sustain an elevated level under various temperature conditions, which enables it to flexibly adapt to diverse environmental conditions, especially suitable for the integration and application of solar photovoltaic systems, and further broaden its potential application range in the field of renewable energy.