Structure, optical properties and thermal stability of TiC-based tandem spectrally selective solar absorber coating

Gao, Xiang‐Hu; Guo, Zhi-Ming; Geng, Qin; Ma, Peipei; Liu, Gang

doi:10.1016/j.solmat.2016.06.050

Cited by 56 publications

(17 citation statements)

References 31 publications

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“…Optical constants of the deposited bulk and ultrathin Cr film also show a difference. It should be due to the thickness-dependent effect of the optical constants for thin metal film, especially for film with thickness smaller than its electron mean free path [33]. The differences between bulk and the ultrathin metal film will inevitably lead to a huge error in the design of solar selective absorber and other related optoelectronic devices.…”

Section: Resultsmentioning

confidence: 99%

“…For the dielectric material of SiO 2 , its optical constants tend to be almost invariant when its film thickness increases to about several nanometers [38]. Nevertheless, due to the thickness-dependent optical constants of ultrathin metal films, optical constants of the semi-transparent Cr layer were obtained from the spectroscopic ellipsometry measurements [32,33]. For solar selective absorber with a relatively smooth surface, it can be regarded as a mirror surface with negligible diffuse reflection.…”

Section: Numerical Designmentioning

confidence: 99%

“…However, in their simulations, the optical constants were obtained from Palik, corresponding to the bulk optical materials [18,30]. In fact, film thickness of the metal absorption layer used in multilayered solar selective absorber was always smaller than 30.0 nm [2,[11][12][13]21,31], smaller than its electron mean free path, resulting in a large difference in its optical constants compared with that of the bulk counterpart [32,33]. Hence, to accurately design the solar selective absorber, optical constants of the ultrathin metal absorption layer must be measured in advance [5].…”

Section: Introductionmentioning

confidence: 99%

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Accurate Design of Solar Selective Absorber Based on Measured Optical Constants of Nano-thin Cr Film

Wang

Cai

et al. 2020

Coatings

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Solar selective absorbers have significant applications in various photothermal conversion systems. In this work, a global optimization method based on genetic algorithm was developed by directly optimizing the solar photothermal conversion efficiency of a nano-chromium (Cr) film-based solar selective absorber aiming to work at the specified working temperature and solar concentration. In consideration of the semi-transparent metal absorption layer employed in multilayered solar selective absorbers, the optical constants of ultrathin Cr film were measured by spectroscopic ellipsometer and introduced into the optimization process. The ultrathin Cr film-based solar selective absorber was successfully designed and fabricated by the magnetron sputtering method for the working temperature at 600 K and a solar concentration of 1 Sun. The measured reflectance spectra of the sample show a good agreement with the numerical simulations based on measured optical constants of ultrathin Cr film. In comparison, the simulated results by using the optical constants of bulk Cr film or literature data exhibit a large discrepancy with the experimental results. It demonstrates the significance of considering the actual optical constants for the semi-transparent metal absorption layer in the design of nano-metal film-based solar selective absorber.

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Section: Resultsmentioning

confidence: 99%

Section: Numerical Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accurate Design of Solar Selective Absorber Based on Measured Optical Constants of Nano-thin Cr Film

Wang

Cai

et al. 2020

Coatings

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“…Figure 2c reveals the Ti 2p spectrum, which can be divided into six peaks. The peaks at 455.26 eV, 455.88 eV, and 461.43 eV originate from Ti-C bond, indicating the existence of TiC [24]. The other three peaks at 457.00 eV, 459.00 eV, and 464.53 eV belong to the Ti-O bond, manifesting the presence of titanium oxide, which is due to the peculiarity of easily absorbing oxygen of Ti.…”

Section: Observation and Characterization Of Tic-coated Graphite Flakementioning

confidence: 98%

Improvement in Mechanical and Thermal Properties of Graphite Flake/Cu Composites by Introducing TiC Coating on Graphite Flake Surface

Zhang

Liu

et al. 2019

Metals

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In this work, TiC coating was successfully deposited on a graphite flake surface via molten salt technique, for the purpose of promoting the interfacial connection between Cu and graphite flake. Vacuum hot pressing was then employed to prepare TiC-coated graphite flake/Cu composite. The results indicate that introducing TiC coating on graphite flake surface can evidently reduce the pores and gaps at the interface, resulting in a significant improvement on the bending strength. When the TiC-coated graphite flake content is 60 vol%, the bending strength is increased by 58% compared with the uncoated one. The coefficient of thermal expansion dropped from 6.0 ppm·K−1 to 4.4 ppm·K−1, with the corresponding thermal conductivity as high as 571 W·m−1·K−1. The outstanding thermal conductivity, apposite coefficient of thermal expansion, as well as superior processability, make TiC-coated graphite flake/Cu composite a satisfactory electronic packaging material with vast prospect utilized in microelectronic industry.

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“…However, Cu has a large atomic diffusion coefficient, particularly when the temperature is higher than 200 C [201,208]. In some commercial products, titanium carbide (TiC) thin film is deposited on the top of Cu as a barrier layer because of its high thermal and chemical stability [209,210]. TiC thin film can be deposited by atomic layer deposition (ALD) [211], PECVD [212], physical vapor deposition (PVD) [213], etc.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of titanium oxynitride thin films and application in selective solar absorber

Zhang¹

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The selective solar absorber (SSA) is one of the key units in the concentrated solar power (CSP) system, which is promising for generating renewable and clean energy with solar energy. The titanium oxynitride (TiNxOy) thin film based SSA has drawn a lot of attention due to many advantages, such as environmental friendliness, low cost, and excellent optical property. In this thesis, the optical properties of TiNxOy thin films have been investigated and the SSA based on TiNxOy thin film has been designed and modeled.

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Structure, optical properties and thermal stability of TiC-based tandem spectrally selective solar absorber coating

Cited by 56 publications

References 31 publications

Accurate Design of Solar Selective Absorber Based on Measured Optical Constants of Nano-thin Cr Film

Accurate Design of Solar Selective Absorber Based on Measured Optical Constants of Nano-thin Cr Film

Improvement in Mechanical and Thermal Properties of Graphite Flake/Cu Composites by Introducing TiC Coating on Graphite Flake Surface

Optical properties of titanium oxynitride thin films and application in selective solar absorber

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