Temperature-induced ageing of solar absorbers on plain and anodized aluminium substrates

Kotilainen, Minna; Mizohata, Kenichiro; Honkanen, Mari; Hyvärinen, Leo; Vuoristo, Petri

doi:10.1016/j.solmat.2014.12.006

Cited by 17 publications

(4 citation statements)

References 27 publications

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“…In addition, the adhesion of solar absorbers is very important for flexible solar absorber applications. A solar absorber is usually used in complex and harsh environments, accompanied by delamination and stripping of coatings, and these problems are more severe for thick multilayered coatings . Therefore, overcoming the challenge of designing ultrathin SSACs by a simple method with excellent solar absorptivity and robust stability is of great importance for the practical application of flexible and wearable energy‐related devices.…”

Section: Introductionmentioning

confidence: 99%

An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber

et al. 2019

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Advances in flexible and wearable energy-related devices increase the need for highly efficient, low-cost, ultrathin solar selective absorber coatings (SSACs). Herein, the fabrication of nanogradient WO x -based SSACs with excellent properties, including a superior solar absorptance of 0.93, an outstanding thermal robustness of up to 300 C, and substrate independence, is reported. More importantly, the thickness of WO x -based SSACs is only approximately 100 nm, which is substantially thinner than all other reported SSACs. These features arise from the two intrinsically absorptive WO x layers on a thin nanoplasmonic W layer. The deposition process is based on self-doped reactive sputtering via limited tungsten oxidation due to a small amount of oxygen. The WO x -based SSACs on a flexible polyimide sheet demonstrate stable performance, strong adhesion, and bendable nature. The proposed self-doped fabrication process provides a new way to design cost-effective ultrathin SSACs to meet the demand for large-scale flexible energy harvesting and supply applications.

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Section: Introductionmentioning

confidence: 99%

An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber

et al. 2019

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“…Al was chosen for investigation as a diffusion barrier because it has been reported to act as a good barrier against Cu diffusion 24 and it acts as a good IR reflector. 8,31 However, both 100-nm- and 500-nm-thick as-deposited Al layers between the Cu substrate and CrO x /Cr/CrO x absorber increased thermal emittance from 0.05 to about 0.10. The Al layers flattened the reflectance curves in the long-wavelength range (see Fig.…”

Section: Discussionmentioning

confidence: 99%

“…8,31 However, both 100-nm-and 500-nm-thick asdeposited Al layers between the Cu substrate and CrO x / Cr/CrO x absorber increased thermal emittance from 0.05 to about 0.10. The Al layers flattened the reflectance curves in the long-wavelength range (see Fig.…”

Section: Diffusion Barrier Properties Of Sputtered Al Coatingsmentioning

confidence: 99%

Aluminium and tantalum nitride barriers against copper diffusion in solar absorbers

Kotilainen

Vuoristo

2016

Surface Engineering

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The thermal stability of magnetron sputtered solar absorber coatings was investigated at temperatures of 200-500°C. Diffusion barriers of aluminium (Al) and tantalum nitride (TaN x ) were studied against thermal diffusion of copper substrate atoms. The diffusion barriers studied were experimental DC magnetron sputtered Al and TaN x layers between a copper substrate and an absorber coating. The absorbers were aged by means of heat treatment in air. The influence of diffusion barriers was analysed by optical and microstructural analyses before and after the ageing procedures. Without a barrier coating, copper substrate atoms diffused through the absorber to the surface, which degraded optical selectivity. The diffusion can be prevented or retarded with a dense diffusion barrier layer. The 500-nm-thick Al barrier layer prevented Cu diffusion and retained optical selectivity at 300°C. At higher temperatures, diffusion was observed but the Al barrier retarded the degradation when compared to an absorber without the barrier layer.

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“…In the case of low-temperature solar collectors, as they operate in outdoor conditions, it is indispensable for these systems to withstand external environmental factors such as high humidity, high temperatures, atmospheric corrosion and ultraviolet irradiance or wind and snow loads depending on the geographic position [ 18 , 19 , 20 ]. Focusing on the selective absorber coatings composed of inorganic oxides, high temperatures can speed up oxidation processes and high levels of humidity may create hydrolytic reactions (electrochemical corrosion) further oxidating the surface [ 21 , 22 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation

et al. 2022

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Solar absorbers in a three-layer configuration have been prepared by dip-coating onto aluminium substrates. They are constituted by two spinel layers with one silica layer on the top and values of solar absorptance above 0.950 and thermal emittance below 0.04 were obtained. The effects of using different sintering conditions of the upper silica layer on the optical behaviour and durability tests have been studied. Results obtained in accelerated ageing methods, such as thermal stability tests and condensation tests, clearly show that the proposed selective absorber exhibits excellent thermal stability and very good humidity resistance. The results show that the protective action is due not only to the silica layer but also to the alumina layer produced during the absorber preparation. The phase composition of the individual layers was independently confirmed using X-ray diffraction and corroborated by X-ray Photoelectron Spectroscopy. Spinel-like phases were obtained in both the first and second layers. The ageing study shows that the three-layer configuration proposed has a very high potential, in terms of both durability and optical behaviour, for solar thermal low-temperature applications.

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Temperature-induced ageing of solar absorbers on plain and anodized aluminium substrates

Cited by 17 publications

References 27 publications

An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber

An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber

Aluminium and tantalum nitride barriers against copper diffusion in solar absorbers

A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation

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Temperature-induced ageing of solar absorbers on plain and anodized aluminium substrates

Cited by 17 publications

References 27 publications

An Ultrathin, Nanogradient, and Substrate‐Independent WOx‐Based Film as a High Performance Flexible Solar Absorber

An Ultrathin, Nanogradient, and Substrate‐Independent WOx‐Based Film as a High Performance Flexible Solar Absorber

Aluminium and tantalum nitride barriers against copper diffusion in solar absorbers

A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation

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Product

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An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber

An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber