Theoretical study of selective absorber and narrowband emitter based on metamaterial matched with InGaAsSb cells for an STPV system

Spectrum‐Selective High‐Temperature Tolerant Thermal Emitter by Dual‐Coherence Enhanced Absorption for Solar Thermophotovoltaics

“…All the efficiencies here are calculated (Section 2, Supporting Information) under the conditions that the solar concentration factor is 1000 and the area ratio is 4 for the actual situations where the solar concentration factor usually does not exceed 1000 suns. [46] For the coupling between two absorption modes with certain real parts and imaginary parts of the eigenfrequencies obtained through the fitting results (Figure S2, Supporting Information), different ways of coupling lead to distinct emission spectra, and eventually cause a change in system efficiency. The intensity can be written as, [63]…”

“…After fully considering the emission spectra, the mechanics, and the thermal lattice matching, a fourlayer (Si/Mo/AlN on a polished Mo substrate) thermal emitter is designed. Compared to the nanostructures like photonic crystals and metasurfaces, [36][37][38][39][40][41][42][43][44][45][46] this fabrication of the emitter is highly scalable without complicated microscale interfaces, ensuring the high-temperature stability at least up to 973 K (testing in the atmospheric environment) for the corresponding device combined with the careful choice of materials. The DCEA provides two emission channels assisting the emitter to have a stepfunction-like spectrum through interference which contributes to the sharp emission cut-off at the falling edge and the suppression of the emission in the mid-infrared.…”