Abstract
Coated glass products, and especially the low-emissivity coatings, have become a common building material used in modern architectural projects. More recently, these material systems became common in specialized glazing systems featuring solar energy harvesting. Apart from achieving the stability of optical parameters in multilayer coatings, it is also important to have improved control over the design of visual color properties of the coated glass. We prepare metal-dielectric composite (MDC)-based multilayer thin-film structures using the radio frequency (RF)-magnetron sputtering deposition and report on their optical and chromaticity properties in comparison with these obtained using pure metal-based Dielectric/Metal/Dielectric (DMD) trilayer structures of similar compositions. Experimentally achieved Hunter L, a, b values of MDC-based multilayer building blocks of coatings provide a new outlook on the engineering of future-generation optical coatings with better color consistency and developing approaches to broaden the range of achievable color coordinates and better environmental stability.
Highlights
The prime cause of global warming is the continued use of fossil fuels
Low-E film characterization that specifications an improved correspondence between spectra weredesign seen frequently, compared to measured using pure-metal layers; thisseen is thefrequently, reason wecompared suggest that the spectral specifications and the film spectra were to dielectric dilutionlayers; couldthis improve interlayer interface studies using using pure-metal is the reason we suggest that quality
2 O3 /Ag/Al2 O3 multilayer building block; measured transmission spectrum plotted with the best-fitted simulated transmission spectrum; the (a) measured transmission spectrum plotted with the best-fitted simulated transmission spectrum; figure legend shows the physical thickness of each particular layer, the inset of the figure shows the the figure legend shows the physical thickness of each particular layer, the inset of the figure shows simulated colorcolor point of film areaarea thatthat matched withwith the color of the trilayer films, (b) the simulated point of film matched the color of as-deposited the as-deposited trilayer films, shows the Chromaticity diagram
Summary
The prime cause of global warming is the continued use of fossil fuels. The excessive use of fossil fuels could lead to the non-renewable energy reserves being depleted and that demands exploring novel materials and alternative technologies to minimize energy consumption. Dalapati et al, reported about the preparation and properties of color-tunable low-cost transparent heat reflectors using copper and titanium oxide for energy-saving applications [40] They proposed to control the color properties of the multilayer structures by means of post-deposition annealing process, which can force the metal layer to transform into an array of nanoparticles and can change the optical properties, e.g., the transmission spectra. DMD-type multilayer structures, thin metallic films play an important role in achieving the required optical transparency, reflectivity, and the color of the coatings. After the successful process development for thin Ag layers, we prepared several batches of metal-dielectric composite (single-layer) films on glass substrates using two separate sputtering targets metal-dielectric composite (single-layer) films on glass substrates using two separate sputtering (Ag and MgF2 ) to establish the optimized process parameters to deposit MDC layers. The content of MgF2 addition to the pure-metal layer was calculated by using the separately measured volumetric content of MgF2 addition to the pure-metal layer was calculated by using the separately partial deposition rates of the sputtering material targets used
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