| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an optical selective film which contributes to efficient conversion of light to heat.SOLUTION: An optical selective film includes at least an Ag-containing layer 11 and an Ag-diffusion prevention layer 12 which is arranged adjacent to the Ag-containing layer, and the Ag-diffusion prevention layer contains FeSi(X=1 to 2). When heating the optical selective film, the Ag-diffusion prevention layer constituting the optical selective film prevents that Ag (silver) in the Ag-containing layer from diffusing to other layers which constitutes the optical selective film to contribute to maintenance of stable optical characteristics. A temperature at which the optical selective film is heated by condensed solar light and heat medium may be 400°C or above, is preferably 600°C or above and is more preferably 700°C or above.</p> |
