Microstructural, optical properties and thermal stability of MgO/Zr/MgO multilayered selective solar absorber coatings

Nuru, Z.Y.; Msimanga, M.; Muller, T.F.G.; Arendse, Christopher J.; Mtshali, C.; Mâaza, M.

doi:10.1016/j.solener.2014.11.009

Cited by 55 publications

(14 citation statements)

References 33 publications

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“…Céspedes et al demonstrated a sputtered Mo-Si 3 N 4 coating which achieved a solar absorptance of 92.6% and an emittance of 11% at 600 C 110. Nuru et al demonstrated 92% solar absorptance and 10% emittance at 400 °C using a e-beam deposited MgO/Zr/MgO structure 111. The current work has thus shown that the multi-applications, if their absorptance and emittance properties can outperform current industry state of the art cermet absorbers.Structuring a surface at scales near or smaller than the desired transition wavelength can enhance the performance of spectrally selective surfaces.…”

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confidence: 72%

Concentrating Solar Power

et al. 2015

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Concentrating solar power (CSP) is a reliable and wellknown form of solar power. Nine solar trough plants producing more than 400 megawatts (MW) of electricity have been operating reliably in the California Mojave Desert since the 1980s. With a renewed sense of urgency to commercialize renewable energy sources, the U.S. Department of Energy (DOE) is ramping up its CSP research, development, and deployment efforts. These efforts, which are leveraging both industry partners and the national laboratories, are directed toward the development of parabolic trough, dish/engine, and power tower CSP systems.

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confidence: 72%

Concentrating Solar Power

et al. 2015

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“…The sunlight is absorbed in the multilayer coating by a process of intrinsic absorption and through mechanism of interference. The major contribution in absorption comes from the destructive interference, which occurs in the interface of two layers [22]. Therefore, the angular dependency of the absorber coating can be explained by interference mechanism.…”

Section: Discussionmentioning

confidence: 99%

Angular solar absorptance and thermal stability of W/WAlN/WAlON/Al2O3-based solar selective absorber coating

Dan

Chattopadhyay

Barshilia

et al. 2016

Applied Thermal Engineering

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In this paper, we report the solar absorptance property of a new tandem absorber consisting of layers W/WAlN/WAlON/Al 2 O 3 that holds promise for solar thermal energy harvesting. The coating was prepared by DC/RF magnetron sputtering on stainless steel substrate. The performance of the film was investigated by measuring the reflectance spectra in the wavelength range of 250-2500 nm and most importantly by varying the incident angle from 18° to 68°. The effect of thermal annealing on the optical properties, microstructure and morphology of the solar selective absorber coating was also explored. The thermal annealing of the coating at 350°C till 550 hrs in air did not result in any significant change in the spectral properties of the absorber coating. The excellent thermal stability and wide range of angular absorptance of this multilayer coating indicate the potential for application as selective coating in mid temperature photothermal conversion systems.

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“…Previous studies suggest that the significant reduction of reflectance, i.e., efficient absorption of the solar radiation can be rationalised by intrinsic absorption as well as absorption due to interference. The latter mechanism plays a major role in this multilayer solar selective absorber coating [38]. A common thread in number of experimental and theoretical studies is to describe the major requirements of selectivity in terms of composition of each layer, number of layers, layer thickness and metallic gradation from bottom to top layer [52][53][54][55][56].…”

Section: Discussionmentioning

confidence: 99%

“…It is well known in literature that the sunlight is absorbed due to destructive interference at the interface of the layers in the multilayer stack of the coating [38]. Therefore, the optical characteristics of the individual layer have also been evaluated by measuring the reflectance spectra of the individual layer in UV-Vis-NIR spectrophotometer in the solar spectrum range of 300-2500 nm and are presented in Fig.…”

Section: Optical Propertiesmentioning

confidence: 99%

Spectrally selective absorber coating of WAlN/WAlON/Al2O3 for solar thermal applications

Dan

Jyothi

Chattopadhyay

et al. 2016

Solar Energy Materials and Solar Cells

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A novel WAlN/WAlON/Al 2 O 3 coating was successfully deposited on stainless steel (SS) substrate using reactive DC and RF magnetron sputtering. Excellent spectrally selective property with a high absorptance of 0.958 in the solar spectrum region and low emittance of 0.08 in the infrared region were achieved by tailoring the target power, deposition time and the reactive flow rates of N 2 and O 2 . In the present solar selective coating, W layer acts as a back reflector and diffusion barrier, WAlN as the main absorber layer, WAlON as the semi-absorber layer, whereas the topmost Al 2 O 3 layer works as an anti-reflecting layer. In reference to the thermal stability, the absorber deposited on SS substrates exhibited high solar selectivity (α/ε) of 0.920/0.11, when heat treated in air up to 500°C for 2 hours. Taken together, the present study demonstrated that the WAlN/WAlON/Al 2 O 3 -based selective absorbing coating with excellent thermal stability could be a promising material for photo-thermal conversion at temperatures of up to 500°C.

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Microstructural, optical properties and thermal stability of MgO/Zr/MgO multilayered selective solar absorber coatings

Cited by 55 publications

References 33 publications

Concentrating Solar Power

Concentrating Solar Power

Angular solar absorptance and thermal stability of W/WAlN/WAlON/Al2O3-based solar selective absorber coating

Spectrally selective absorber coating of WAlN/WAlON/Al2O3 for solar thermal applications

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