Durability tests of solution-chemically derived spectrally selective absorbers

Single-layer absorbers without an AR layer typically attain a normal solar absorptance of 0.80 and a normal thermal emittance of 0.03. Of the samples made with durable films a 70/30 silica/titania mixture showed the greatest increase of the αsol value, 0.91, while the thermal emittance remained unaltered.