Novel Mo–Si3N4 based selective coating for high temperature concentrating solar power applications

Importance of the spectral emissivity measurements at working temperature to determine the efficiency of a solar selective coating

“…(2) and 3.7 for Eq. (1) [13]. Therefore, for the coating studied in this work, the difference between the values of radiative thermal losses calculated with Eqs.…”

Spectrally Solar Selective Coatings for Colored Flat Plate Solar Thermal Collectors

“…Among PVD methods (e.g. evaporation, ion plating, pulsed laser deposition, sputtering), magnetron sputtering seems to be the most suitable for industrial deposition of large-area solar selective coatings [1,3,[10][11][12]; although efficient and allowing a perfect control, these techniques are intensive energy consumers, making the overall energy balance of the product quite unsustainable. A broad range of these materials are mainly deposited using wet chemical techniques: electrodeposition, anodization, sol-gel, solution growth, spray pyrolysis etc.…”

“…Most of black solar absorber coatings are formed by cermets composed of metals such as Mo, Ni, Cu, Fe, Cr, Au or Pt embedded in ceramic matrixes of (a) metal oxides: Al 2 O 3 [1,11,14,[20][21][22][23], NiO [18,24], CrNiO x [14,25], Cu x O [19,[26][27][28][29] and SiO 2 [1], (b) oxynitrides: NbAlON [28], CrON [12], or (c) nitrides: NbAlN [28], Si 3 N [3], CrMoN [12].…”

“…Related to nitrides and oxynitrides based cermets (Table 1), only few examples are reported in literature [3,12,28,32] and recently, a selective coating based on Mo-Si 3 N 4 was reported [3]. Accurate combination of the individual component layers based on optical simulations and precise control of layers thickness and composition leads to the highest solar spectral selectivity (S = 54.5), known so far to the best of our knowledge.…”

“…54.5 for Mo-Si 3 N 4 black multilayered coating [3] and 21.3 for a colored (red) titanium nitride coating [4]; to reduce scattering and reflection, an anti-reflective coating is recommended to be added.…”