Abstract

Thermophotovoltaic (TPV) devices via efficient emitter are used to convert thermal radiation into electricity. We propose new one-and two-dimensional (1D and 2D) nanostructures to reach the broadband highly efficient TPV emitters. The performance of the model is enhanced by more interaction between the excited surface plasmon polaritons and the magnetic polaritons based on the multilayer structure using 1D periodic shallow grating and 2D biperiodic cylindrical deep grating. The highly improved rigorous coupled-wave analysis method is used to predict the emittance with the fewest diffraction orders. It is shown that the proposed wavelength-selective and diffuse-like 1D emitter has high emittance—more than 0.9 and 0.96 in the broadband spectral regions from 0.7 to 1.87 μm and 0.73 to 1.83 μm, respectively, and is silicon-compatible, especially for integrated device technology. Also, for the 2D polarization-insensitive proposed structure, there is high emittance—more than 0.97 from 0.6 to 1.6 μm. The emittance of both structures is below 0.2 at wavelengths longer than 2.55 μm. The strip width of the grating and the emission angle can be set to change the emittance spectrum to improve the conversion efficiency of the photovoltaic cell.

© 2019 Optical Society of America

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