Silicon-based spectrally selective emitters with good high-temperature stability on stepped metasurfaces

Abstract

Solar thermophotovoltaic (STPV) system has attracted increasing attention due to its great prospects for breaking Shockley-Queisser limit. As the critical component of high-performance STPV systems, spectrally selective emitter with good...

An elliptical nanoantenna array plasmonic metasurface for efficient solar energy harvesting

“…These energy conversion channels may be used for numerous applications in air (or vacuum) environments and water surroundings. In air environments, they can be solar absorbers and emitters in solar thermophotovoltaic (STPV) systems, 16,17 photodetectors, 18 and solar thermoelectric generators (STEGs). 19,20 In water environments, they can be used in photothermal vaporization for water desalination, purification, sterilization, and seawater treatment to produce fresh water.…”

Nanolayered Wavelength-Selective Narrowband Thermal Emitters for Solar Thermophotovoltaics

“…Conversely, sub-bandgap photons cannot be absorbed to excite electron–hole pairs. , Thus, the spectral reshaping of the broadband sunlight to narrowband thermal radiation exactly above the photovoltaic (PV) cell is the core of a solar thermophotovoltaic (STPV) system, of which the theoretical maximum efficiency can reach 85.4% . Thus, narrowband wavelength-selective thermal emitters are required to improve the energy conversion efficiency of STPVs. − To date, various artificial nanostructures have been investigated to fabricate wavelength-selective emitters, such as artificial microstructures, , gratings, photonic crystals (PhCs), and meta-surfaces. , However, the nonresonant nature of PhCs makes it difficult to achieve narrowband thermal emission and high emissivity . In addition, 2D or 3D nanostructure fabrication tends to be complex and costly.…”

“…6−11 To date, various artificial nanostructures have been investigated to fabricate wavelength-selective emitters, such as artificial microstructures, 12,13 gratings, 14 photonic crystals (PhCs), 15 and meta-surfaces. 16,17 However, the nonresonant nature of PhCs makes it difficult to achieve narrowband thermal emission and high emissivity. 18 In addition, 2D or 3D nanostructure fabrication tends to be complex and costly.…”