Fabrication and Optical Properties of Low-Emissivity Coatings of AlSiN and AgCuNd-Alloy Multilayer Films on Glass

Abstract

Transparent low-emissivity coatings comprised of AlSiN and Ag-alloy multilayer films were investigated. All films were prepared by dc magnetron sputtering. AlSiN/Ag-alloy/AlSiN/Ag-alloy/AlSiN multilayer films were prepared on glass substrates. Three types of Ag-alloys were used: Ag87.5Cu12.5, Ag88Au4.6Cu7.3Ti0.1, and Ag95.8Cu2.2Nd2 films. Thicknesses of the Ag-alloy films were controlled to be in the range of 10–12 nm thick. Compared to the AgCu- and AgAuCuTi-alloys, the AgCuNd-alloy films showed superior optical properties. The maximum transmittance (Tmax) was 85.6% for multilayer coatings with 10-nm-thick Ag95.8Cu2.2Nd2-alloy films. The maximum transmittance is 4 and 7% higher than for the coatings with Ag89.5Au7Cu3Ti0.5- and Ag87.5Cu12.5-alloy films, respectively. In the case of AlSiN (43 nm)/Ag95.8Cu2.2Nd2 (11 nm)/AlSiN (86 nm)/Ag95.8Cu2.2Nd2 (11 nm)/AlSiN (43 nm) multilayer coatings, 79.7% visible light transmission (Tvis) and a shading coefficient of 0.50 were obtained. This indicates that well-balanced transparent low-emissivity coatings with both high visible transparency and good solar infrared shading can be produced for multilayer coatings with the AgCuNd-alloy films.

The optical properties of low infrared transmittance WO3−x nanocrystal thin films prepared by DC magnetron sputtering under different oxygen ratios

“…High transmittance in visible range and low transmittance in near infrared range were demonstrated. The difference between visible and near-infrared ranges was used in infrared shielding, [28][29][30] such as the energy conservation in buildings. In summer, the sunlight ows into the house, but the heating parts of solar spectrum will be isolated out of door.…”

(Cr/TiAlCrN/TiAlN/AlSiN/AlSiO) Multi Layer Solar Selective Coatings for Concentrated Solar Power Plant

“…In addition to the above factors the advanced receiver technology demands coatings that are stable up to 600 o C. From literature, these high end applications can be easily addressed through the use of PVD developed solar absorber coatings. In general, so far, most of the reported absorber materials are metal oxides [12][13][14][15][16][17][18][19] and there are very few nitrides [8][9][10]. Barshilia et al [20,21] recently reported Ag-Al 2 O 3 solar selective coatings with absorbance and emission of 0.93, 0.04 -0.05 respectively at 82 o C in the IR region.…”

Advancement of Solar Selective DLC Coating Using Capvd for Solar Thermal Applications

“…In addition to the above factors, the advanced receiver technology demands coatings that are stable up to 600 o C. From literature, these high end applications can be easily addressed with PVD developed solar absorber coatings. In general, so far, most of the reported absorber materials are metal oxides [16][17][18][19][20][21] and there are very few nitrides [22]. The same group has also reported TiAlN/TiAlON/Si3N4 absorber grown using magnetron sputtering.…”