Nano-Cr-film-based solar selective absorber with high photo-thermal conversion efficiency and good thermal stability

Zhou, Wei-Xi; Shen, Yan; Hu, Ertao; Zhao, Yuan; Sheng, Ming-Yu; Zheng, Yuanzhou; Wang, Song-You; Lee, YoungPak; Wang, Cai‐Zhuang; Lynch, David W.; Chen, Liang‐Yao

doi:10.1364/oe.20.028953

Cited by 51 publications

(31 citation statements)

References 18 publications

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“…The numerous applications are divided into two main groups. First one is the optical and electrical applications such as, optical detectors, sensors, optical filters, lenses, emitting diodes, on concentrating solar power (CSP) [23][24][25][26][27][28] and phase shifting masks [29,30]. The second group is for plastic metal molds, cutting and drilling tools [31,32], due to their high hardness and wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Characterization of magnetron sputtered sub-stoichiometric CrAlSiN x and CrAlSiO y N x coatings

AL-Rjoub

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Cerqueira

et al. 2017

Surface and Coatings Technology

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The influence of varying nitrogen and oxygen partial pressures on microstructure, mechanical and optical properties of magnetron sputtered CrAlSiN x and CrAlSiO y N x coatings has been studied. The partial pressure of nitrogen reactive gas was varied from 0.037 Pa to 0.15 Pa for CrAlSiN x films, and the N 2 /O 2 (85%:15%) partial pressure was varied from 0.046 Pa to 0.21 Pa for CrAlSiO y N x layers. Transmittance and reflectance of samples were measured and were modeled to obtain the spectral optical constants, n and k. Chemical state, composition, morphology and microstructure of films were analyzed by XPS, RBS, XRD, Raman Spectroscopy and SEM. Films' hardness was evaluated using nanoindentation method. XRD results revealed that the two samples CrAlSiN x with P N = 0.15 Pa and CrAlSiO y N x with P NO = 0.21 Pa are polycrystalline with cubic (fcc-B 1 ) structure. On contrary, all other films prepared with lower reactive gases partial pressures are amorphous. The chemical composition changed with the variation of reactive gases partial pressure, although the Cr: Al: Si composition ratio remained approximately constant, 1.25:1.5:1. All samples showed low hardness, mainly due to lower content of reactive gases and higher content of Si. However, the sample CrAlSiN x with P N = 0.15 Pa has the highest value of 11.1 GPa. Optical constants are seen to be very sensitive to reactive gases partial pressure. The refractive index and extinction coefficient were lower for coatings with higher reactive gases partial pressure. These coatings are good candidates for designing selective solar absorber stacks for different applications.

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Section: Introductionmentioning

confidence: 99%

Characterization of magnetron sputtered sub-stoichiometric CrAlSiN x and CrAlSiO y N x coatings

AL-Rjoub

Rebouta

Cerqueira

et al. 2017

Surface and Coatings Technology

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“…Resulting from the broadband behavior, the angular sensitive property is greatly mitigated for both p‐ and s‐polarization light as is seen from Figure c, which is highly desirable in diverse applications. It is noteworthy that the absorption performance can be further enhanced by incorporating an additional dielectric AR layer atop …”

Section: Broadband Perfect Absorbersmentioning

confidence: 99%

“…Broadband absorbers contrast with the aforementioned color filters whose function is to produce a relatively sharp resonance to filter a narrow spectral range of visible light. Much effort has been devoted toward achieving “perfect absorption”, which can enable various applications such as photovoltaics, solar‐thermal harvesting, photodetectors, thermal emitters, and bolometers, owing to their exceptional absorption characteristics with unique functionalities for energy harvesting and conversion …”

Section: Introductionmentioning

confidence: 99%

Engineering Light at the Nanoscale: Structural Color Filters and Broadband Perfect Absorbers

Lee

et al. 2017

Advanced Optical Materials

168

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Recent advances in fabrication and processing methods have spurred many breakthroughs in the field of nanostructures that provide novel ways of manipulating light interaction on a well controllable manner, thereby enabling a wide variety of innovative applications. Structural colors have shown great promise as an alternative for existing colorant‐based filters due to their noticeable advantages, which open up diverse potential applications such as energy‐efficient displays, ultrahigh‐resolution imaging, ultrahigh‐sensitivity biosensors, and building‐integrated photovoltaics. Broadband perfect absorbers, which exploit extraordinary optical phenomena at subwavelength scale, have also received increasing attention due to their capability of improving efficiency and performance characteristics of various applications including thermoelectrics, invisibility, solar‐thermal‐energy harvesting, and imaging. This review highlights some recent progress in these two related fields. The structural colors based on optical resonances in thin‐film structures, guided‐mode resonances in slab waveguide gratings, and surface plasmon resonances in plasmonic nanoresonators are described. Representative achievements associated with the broadband perfect absorbers, which include schemes employing highly absorbing media, multi‐cavity resonances, and broadband impedance matching are investigated.

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“…In the last few decades, considerable efforts have been channeled toward developing high and broadband solar selective absorbers for photon-thermal conversion [1]. The ideal solar selective absorber absorbs sunlight by trapping the photons in the layered structures and reflects far-infrared light to prevent thermal radiative emission from the substrate [2].…”

Section: Introductionmentioning

confidence: 99%

Analysis of High-Efficiency Mo-Based Solar Selective Absorber by Admittance Locus Method

et al. 2019

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High absorptivity and low emissivity are characteristics needed in an ideal solar selective absorber. In high-temperature applications, such as a solar concentration power system in which the solar surface works under a long-term high temperature (about 400 to 800 °C), the absorber material has to maintain high absorption in the visible region, high reflectance in the infrared region, and excellent thermal stability at high temperature. In this research, the design of a molybdenum-based (Mo-based) solar selective absorber was analyzed by the admittance locus method, and the films were deposited by magnetron sputtering. The ratio of the extinction coefficient to the refractive index of the Mo layer was close to 1, so that the Mo-based solar selective absorber had a broad absorption band, high absorption, and good solar selectivity. Its average reflectance in the visible region was less than 0.4%. The experimental absorption was 97.1% (simulated absorption was 98%) and the emissivity was from 13% to 20% (simulated emissivity was 8% to 26%) as the temperature increased from 400 to 800 °C.

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Nano-Cr-film-based solar selective absorber with high photo-thermal conversion efficiency and good thermal stability

Cited by 51 publications

References 18 publications

Characterization of magnetron sputtered sub-stoichiometric CrAlSiN x and CrAlSiO y N x coatings

Characterization of magnetron sputtered sub-stoichiometric CrAlSiN x and CrAlSiO y N x coatings

Engineering Light at the Nanoscale: Structural Color Filters and Broadband Perfect Absorbers

Analysis of High-Efficiency Mo-Based Solar Selective Absorber by Admittance Locus Method

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