| 摘要 |
A solar absorber has a substrate covered with at least three thin layers. The outermost layer may be an anti-reflection layer. The innermost layer is composed by nano-particles embedded in a dielectric matrix. With Ni particles used in an alumina matrix, an aluminum to nickel atomic ratio between 0.15-0.25, and preferably between 0.18-0.23 is applied. Also the second layer may be of nano-particles embedded in a dielectric matrix of alumina, with an aluminum to nickel atomic ratio between 0.8-1.2. The innermost layer may have a thickness of 68-98 nm, while the second layer has a thickness of 50-80 nm. The nickel particles may have an average diameter of 5-10 nm. The anti-reflection layer may have a refractive index in the solar spectrum wavelength interval of 1.38-1.46 with a thickness of 48-78 nm. |
