High-temperature and high-spectral efficiency rectangular cuboid metamaterial selective emitter for low band gap thermo-photovoltaic application

The primary energy source for the whole world's energy consumption is fossil fuels, which are non-renewable energy resources. In this research, we have designed broadband, wide angle and polarization independent and rectangular cuboid metamaterial (MDM) emitter for low band gap thermo-photovoltaic application that category under renewable energy. The designed emitter considered 2.3-μm cutoff wavelengths to increase the conversion efficiency of InGaAsSb cell at high temperature. For necessary broadband emission from the emitter, different geometric parameters were optimized such as the height of cuboid, length of cuboid, dielectric thickness and width of unit cell while width and height of ground tangiest and distance of rectangular from center were remain fixed. The mean emittance of emitter achieved 93% in the wavelength range of \(0.3-2.3\;\mu {\text{m}}\) $0.3-2.3\mu \text{m}$ as proved by numerical simulation. As compared to other, the proposed emitter for the InGaAsSb cell has higher spectrum efficiency at high temperature. Furthermore, at 1600 K, the rectangular cuboid emitter achieved 89% spectral efficiency with an InGaAsSb band gap of 0.53 eV.