The influence of oxygen in TiAlOxNy on the optical properties of colored solar-absorbing coatings

Zhu, Dechun; Mao, Fang; Zhao, Shuxi

doi:10.1016/j.solmat.2011.11.001

Cited by 33 publications

(13 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At higher N 2 content, an increase of the resistivity in the TiAlN has been reported, which is consistent with a low extinction coefficient and thus an insulating character of the film (Irudayaraj et al, 2008). The n and k of TiAlON have similar trends and the values were close to those reported by Zhu et al (2012). The dependence of the refractive index of TiAlON on N 2 flow is similar to that of TiO x N y , showing a slightly increasing trend in refractive index at a certain N 2 flow range (Venkataraj et al, 2006).…”

Section: Optical Constants Of Individual Layerssupporting

confidence: 85%

Optimization of TiAlN/TiAlON/Si3N4 solar absorber coatings

Ali

Søndergaard

et al. 2015

Solar Energy

View full text Add to dashboard Cite

Section: Optical Constants Of Individual Layerssupporting

confidence: 85%

Optimization of TiAlN/TiAlON/Si3N4 solar absorber coatings

Ali

Søndergaard

et al. 2015

Solar Energy

View full text Add to dashboard Cite

“…The intention with the model spectra in Fig 4 is to confirm that the model exhibits the peak shifts, i.e. colour change, with film thickness, as previously reported in the solar absorber related works 3,4 .…”

Section: Fitting (Lines) Of the Calculated T-and R-spectra To The Expsupporting

confidence: 78%

“…Furthermore, by adding a small amount of oxygen to the sputtering atmosphere, an antireflecting TiAlON-coating can be deposited that further enhances the solar selectivity. 4 In this work we shall report model calculations for the system TiAlN/Al to confirm that different reflected colours can be obtained by sputtering the same inhomogenous material but with different thicknesses. With separate studies of the different films on a transmitting substrate, the parameter values for a dispersive model have been determined and used for thin film calculations.…”

Section: Introductionmentioning

confidence: 86%

“…The possibility of close colour control with the same set of sputtering conditions and only adjusting the film thickness was noted empirically by spectral measurements and calculation of the CIE colour coordinates. 3,4 In this contribution we shall look more closely on the explanation for this observation. The fact that a material with strong absorption caused by interband transitions exhibits colour change in reflectance with thickness will be illustrated with calculations for a single film on a metal substrate.…”

Section: Introductionmentioning

confidence: 92%

“…Previous reports from our laboratories have demonstrated that reactive, magnetron sputtering from one or two targets can be used to obtain a wide variety of surfaces, at least in lab-scale, with favourable optical, thermal and mechanical properties for solar absorbers. 3,4 In particular a surface based on sputtered TiAlON on an Al substrate may exhibit several non-black colours with very modest loss in thermal efficiency. Strong dark colours, different from black, cause only weak reflectance losses in the visible.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Colour control and selectivity in TiAlN solar-thermal absorbers

2011

Self Cite

View full text Add to dashboard Cite

Optical constants for simulations were obtained by R-and T-measurements on TiAlN thin films deposited on Corning 7059 glass. The model parameterized free carrier effects and an inter-band excitation. The calculations demonstrated that the colour effects are due to interference and inter-band absorption around 500 nm in a single layer coating. The peak shifts with the thickness of the thin film which gives a simple way to obtain different colours. Solar absorptance of 86 % can be reached already for a single TiAlN-film on an Al substrate.

show abstract

Self‐Doped TiAl Nanoparticle/AlN Metal‐Cermet Solar Selective Absorbing Films

Shi

Zhao

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

which can absorb solar radiation with energy that larger than the bandgap. The photothermal conversion includes hightemperature use (100-400 °C), such as water heating, distillation and desalination. [12,13] At elevated temperatures from 400 to 500 °C or higher, such as parabolic trough collectors, SSAFs are required to have excellent thermal stability. [8,14] The high temperature thermostability is a key hurdle toward real applications of SSAFs. Hence, it is of great significance to study the high-temperature thermal stability of metal-dielectric composites.AlN has excellent attention in fabricating SSAFs due to the high thermal conductivity, dielectric resistance, and chemical stability. Meanwhile, Ti has high hardness and excellent thermal stability at high temperatures, as well as outstanding inoxidizability. Hence the Ti is a good candidate for IR reflector and diffusion barrier at elevated temperatures in SSAFs, while AlN is suitable for the absorber layer. In this type of SSAF, metal particles (NPs) are usually embedded in the highly infrared reflective substrate. While optical properties can be optimized by varying the NPs concentration, size and thickness. [15] Metal NPs are unstable at high temperature, which is unsuitable for usage. Alloying is an effective way to enhance metal high temperature stability. [16,17] Schuh et al. [18] propased alloy stability based on a novel thermodynamic model is applied to design stable nanostructured tungsten alloys. And an outstanding candidate alloy is Wti. [18,19] Since then, an alloy stability map was gradually demonstrated, including AgAl, [20,21] AgAu, [22] PtNi, [23] etc. To date, NPs have been proved to have excellent thermal stability at elevated temperatures up to ≈1000 °C, which is ascribed to the segregation and occupation of alloying. This is mainly due to the heterogeneous chemical distribution that is based on conventional bulk thermodynamics and plasmonic effect. [24][25][26] In recent years, Me-AlN (Me = metal) thin films with variable optical properties have been reported as the extraordinary photothermal material. [27] And due to its excellent hightemperature resistant performance in vacuum environment, which was widely used in all-glass evacuated solar collection tubes in China with large quantities. The main advantage of manufacturing Ti-AlN absorber coating is that the commercial production procedure requires only aluminum and titanium targets. But improving the films' high-temperature thermal stability is still one of the critical issues to be addressed. Besides, the SSAFs are usually black or dark blue to pursue high solar Metal-cermet solar selective absorber films (SSAFs) with nanoparticles embedded in dielectric matrix have been widely used in the field of solar thermal conversion. A new SSAF of TiAlN is fabricated via magnetron sputtering method. By co-sputtering Ti and Al targets, TiAl nanoparticles are embedded in AlN matrix to form self-doped absorber layer. And the outermost rough AlN antireflective layer further enhances the optical pr...

show abstract

The influence of oxygen in TiAlOxNy on the optical properties of colored solar-absorbing coatings

Cited by 33 publications

References 27 publications

Optimization of TiAlN/TiAlON/Si3N4 solar absorber coatings

Optimization of TiAlN/TiAlON/Si3N4 solar absorber coatings

Colour control and selectivity in TiAlN solar-thermal absorbers

Self‐Doped TiAl Nanoparticle/AlN Metal‐Cermet Solar Selective Absorbing Films

Contact Info

Product

Resources

About