Antireflective all-dielectric metamaterials for thermophotovoltaic systems based on multiresonance

The efficient utilization of energy is essential for the normal and effective operation of photovoltaic (PV) cells in thermophotovoltaic (TPV) systems. In this work, a broadband metamaterial antireflective coating (ARC) is proposed to reduce the reflection losses, and Mie and Fabry-Pe<acute accent>rot multiple resonances are used to optimize the performance of TPV systems. Simulations and analyses are carried out using finite-difference time-domain method and multipole decomposition to study the implementation of multiresonance responses of silicon resonator nanoarrays. The designed ARC exhibits an excellent average reflectivity of 1.71% in the near-infrared band, which significantly reduces the surface Fresnel reflection. The corresponding output power of the TPV systems is increased by 24.58% through InGaAsP/InGaAsP/InGaAs triple-junction PV cells. The metamaterial ARC design strategy can be broadly applicable, covering numerous material types and a long wavelength range, allowing for flexible application in various demanding scenarios.