Solar energy absorptive coating, arrangement of the coating on a substrate, method for manufacturing the arrangement and use of the arrangement

Abstract

A solar energy absorptive coating for absorbing sunlight energy is provided. The coating includes a multilayer stack including, a first absorbing layer with first absorbing layer material for absorbing an absorption radiation of a certain spectrum of the sunlight, a transmission dielectric layer with a transmission dielectric layer material for a transmission of the absorption radiation, and a second absorbing layer with a second absorbing layer material for absorbing the absorption radiation, wherein at least one of the absorbing layer materials has an absorbing layer material refractive index for the absorption radiation, between 1.5 and 4.0, and an absorbing layer material extinction coefficient for the absorption radiation, between 0.8 and 3.0, and the transmission dielectric layer material has a dielectric layer material refractive index for the absorption radiation, between 1.0 and 3.0, and a dielectric layer material extinction coefficient for the absorption radiation, between 0.0 and 0.2.

1 - 20 . (canceled) 
     
     
         21 . A solar energy absorptive coating for absorbing sunlight energy, comprising:
 a multilayer stack, comprising the following stacking sequence:
 a first absorbing layer with a first absorbing layer material for absorbing an absorption radiation of a certain spectrum of the sunlight; 
 a transmission dielectric layer with a transmission dielectric layer material for a transmission of the absorption radiation; and 
 a second absorbing layer with a second absorbing layer material for absorbing the absorption radiation; 
   wherein at least one of the absorbing layer materials from the first absorbing layer or the second absorbing layer includes an absorbing layer material refractive index for the absorption radiation, which is selected from a first range between 1.5 and 4.0, and an absorbing layer material extinction coefficient for the absorption radiation, which is selected from a second range between 0.8 and 3.0, and   wherein the transmission dielectric layer material includes a dielectric layer material refractive index for the absorption radiation, which is selected from a third range between 1.0 and 3.0, and a dielectric layer material extinction coefficient for the absorption radiation, which is selected from a fourth range between 0.0 and 0.2.   
     
     
         22 . The solar energy absorptive coating according to  claim 21 ,
 wherein the multi layer stack further comprises a further transmission dielectric layer with a further transmission dielectric layer material,   wherein the further transmission dielectric layer material has a further dielectric layer material refractive index for the absorption radiation, which is selected from a fifth range between 1.0 and 3.0, and a further dielectric layer material extinction coefficient for the absorption radiation, which is selected from a sixth range between 0.0 and 0.2, and   wherein the further transmission dielectric layer is directly attached to one of the absorbing layers such, that this absorbing layer is arranged between the transmission dielectric layer and the further transmission dielectric layer.   
     
     
         23 . The solar energy absorptive coating according to  claim 22 ,
 wherein the multi layer stack further comprises a further absorbing layer with at least one further absorbing layer material,   wherein the further absorbing layer material has a further absorbing layer material refractive index for the absorption radiation, which is selected from a seventh range between 1.5 and 4.0, and a further absorbing layer material extinction coefficient for the absorption radiation, which is selected from an eighth range between 0.8 and 3.0, and   wherein the further absorbing layer is directly attached to the further transmission dielectric layer such, that the further transmission dielectric layer is arranged between the first absorbing layer and the further absorbing layer, or the further absorbing layer is directly attached to the further transmission dielectric layer such that the further transmission dielectric layer is arranged between the second absorbing layer and the further absorbing layer.   
     
     
         24 . The solar energy absorptive coating according to  claim 21 , wherein at least one of the absorbing layer materials is a cermet. 
     
     
         25 . The solar energy absorptive coating according to  claim 24 ,
 wherein the cermet comprises a composite having a composite matrix with a dielectric matrix material and metal particles of a metal, and   wherein the metal particles are distributed in the composite matrix.   
     
     
         26 . The solar energy absorptive coating according to  claim 21 , wherein the transmission dielectric layer material and/or the dielectric matrix material is selected from the group consisting of Aluminium Oxide, Silicon Oxide, Titanium Oxide and Zirconium Oxide. 
     
     
         27 . The solar energy absorptive coating according to  claim 25 , wherein the metal is selected from the group consisting of Molybdenum, Tantalum and Tungsten. 
     
     
         28 . The solar energy absorptive coating according to  claim 25 , wherein a metal content of the metal particles in the composite is selected from a ninth range between 25 vol. % and 50 vol. %. 
     
     
         29 . The solar energy absorptive coating according to  claim 21 , wherein at least one of the absorbing layers comprises an absorbing layer thickness selected from a tenth range between 1 nm and 100 nm 
     
     
         30 . The solar energy absorptive coating according  claim 29 , wherein a first absorbing layer thickness of at least one of the absorbing layers is selected from an eleventh range between 5 nm and 30 nm and a second absorbing layer thickness of at least one of the the other absorbing layer is selected from a twelfth range between 30 nm and 50 nm 
     
     
         31 . An arrangement, comprising:
 a solar energy absorptive coating according to  claim 21  arranged on a substrate surface of a substrate,   wherein one of the absorbing layers is directly attached to the substrate surface.   
     
     
         32 . The arrangement according to  claim 31 , wherein the substrate surface comprises an infrared light reflecting surface. 
     
     
         33 . The arrangement according to  claim 31 , wherein an anti reflective coating for the absorption radiation is attached on a side of the multilayer stack, which is averted to the substrate surface of the substrate. 
     
     
         34 . The arrangement according to  claim 31 ,
 wherein the substrate is part of a heat receiver tube of a power plant for converting solar energy into electrical energy, and   wherein the heat receiver tube carries a thermal liquid for absorbing the sunlight energy.   
     
     
         35 . A method for manufacturing an arrangement according to  claim 31 , the method comprising:
 providing the substrate with a substrate surface; and   attaching the multilayer stack on the substrate surface of the substrate.   
     
     
         36 . The method according to  claim 35 , wherein for the attaching the multilayer stack on the substrate surface of the substrate a thin film deposition technique is used. 
     
     
         37 . The method according to  claim 36 , wherein the thin film deposition technique is selected from the group consisting of atomic layer deposition, chemical vapor deposition and physical vapor deposition. 
     
     
         38 . The method according to  claim 37 , wherein a sputtering is used as the physical vapor deposition. 
     
     
         39 . The method according to  claim 38 , wherein the sputtering is carried out with the aid of a DC power supply.