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Selective solar absorbers (SSAs) with high performance are the key toconcentrated solar power systems. Optical metamaterials are emerging as apromising strategy to enhance selective photon absorption, however, thehigh-temperature resistance (>500C) remains as one of the main challenges fortheir practical applications. Here, a multilayered metamaterial system(Al2O3/W/SiO2/W) based on metal-insulator-metal (MIM) resonance effect has beendemonstrated with high solar absorptance over 92%, low thermal emittance lossbelow 6%, and significant high-temperature resistance: it has been proved thatthe optical performance remains 93.6% after 1-hour thermal annealing underambient environment up to 500C, and 94.1% after 96-hour thermal cycle test at400C, which is also confirmed by the microscopic morphology characterization.The spectral selectivity of fabricated SSAs is angular independent andpolarization insensitive. Outdoor tests demonstrate that a peak temperaturerise (193.5C) can be achieved with unconcentrated solar irradiance and surfaceabrasion resistance test yields that SSAs have a robust resistance to abrasionattack for engineering applications.

High-temperature and Abrasion Resistant Selective Solar Absorber under Ambient Environment