High performance solar selective absorbers constructed by multilayers

High-performance solar absorbers need to have high solar absorptivity and low infrared thermal emissivity at the same time. They are core part for architecture integratable solar thermal technologies such as solar water heaters and solar thermoelectric generators. In this work, we presented a kind of solar absorber with TiN
x
O
y
-based multilayers. Its solar absorbance can be as high as 97.5% and infrared thermal emissivity as low as is 4.3% with total thickness less than 300 nm. The solar absorbance can maintain above 90% for a broad incident angle to 65°.