A new selective solar absorbers (SSA) optimized to work at 250°C without concentration is presented. The new SSA, based on Cr2O3/Cr multilayers, allows to obtain very high thermal efficiency up to 250°C in evacuated flat solar thermal panels without concentration. Multilayers have been deposited by magnetron sputtering on different copper substrates and characterized by reflectivity measurement as well as calorimetric measurements. Stagnation temperatures close to 400 °C have been obtained with a nominal irradiance of 1000W/m2. These results pave the way to the use of evacuated flat thermal panels for green industrial steam generation.
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