Spectrally selective composite coatings of Cr–Cr2O3 and Mo–Al2O3 for solar energy applications

Teixeira, V.; Sousa, Érika M.L.; Costa, Manuel F. M.; Nunes, C.; Rosa, Luis G.; Carvalho, María Miguel; Collares-Pereira, Manuel; Román, E.; Gago, José Ángel Martín

doi:10.1016/s0040-6090(01)01051-3

Cited by 129 publications

(63 citation statements)

References 10 publications

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“…Cr-Cr 2 O 3 cermets have been deposited by using Cr and Cr 2 O 3 composite targets with radio frequency (RF) sputtering or using a single Cr target via reaction sputtering in Ar+O 2 gas flow 39,40 .…”

Section: Sputteringmentioning

confidence: 99%

A review of cermet-based spectrally selective solar absorbers

Cao

McEnaney

Chen

et al. 2014

Energy Environ. Sci.

432

285

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Spectrally-selective solar absorbers harvest solar energy in the form of heat. Solar absorbers using cermet-based coatings demonstrate a high absorptance of the solar spectrum and a low emittance in the infrared (IR) regime. Extensive work has been done to optimize cermet-based solar absorbers to achieve high performance by exploring different cermet (ceramic-metal composite) materials and film configurations through different preparation techniques such as electrodeposition, sputtering, pulsed laser deposition, and solution-based methods. In this article, we review the progress of cermet-based spectrally-selective absorbers with high solar absorptance and low thermal emittance, such as Cr 2 O 3 , Al 2 O 3 , AlN, SiO 2 , and ZrO 2 based cermets as absorption layers. We also present an outlook for cermet-based spectrally-selective absorbers with high thermal stability and high conversion efficiency from sunlight to heat.

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Section: Sputteringmentioning

confidence: 99%

A review of cermet-based spectrally selective solar absorbers

Cao

McEnaney

Chen

et al. 2014

Energy Environ. Sci.

432

285

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“…78 Then, various spectrally selective surfaces, such as black chrome coatings, Ni-Al 2 O 3 cermet-based surfaces, Cr/Cr x O y /Cr 2 O 3 multilayer absorber coatings and paints including organic black carbon and inorganic pigment FeMnCuO x , were extensively investigated. [78][79][80][81][82][83][84] According to the film configuration and absorption mechanism, solar absorbers can be categorized into six types. 75 Among these types, most of the practically useful absorbers, including multilayer absorbers, cermet-based absorbers and textured surfaces, have metallic nanostructures.…”

Section: Metallic Nanostructure-enabled Selective Solar Absorbermentioning

confidence: 99%

“…The graded Cr-Cr 2 O 3 layers on Cu substrates exhibited a higher absorptance in the range of 0.90-0.94 and a lower emittance of 0.04. 80 Al 2 O 3 was then widely used as the dielectric material because of its high thermal and chemical stability. Sputtered Ni-Al 2 O 3 selective coatings were extensively investigated for mid-and high-temperature applications.…”

Section: Multilayer Absorbersmentioning

confidence: 99%

Metallic nanostructures for light trapping in energy-harvesting devices

et al. 2014

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Solar energy is abundant and environmentally friendly. Light trapping in solar-energy-harvesting devices or structures is of critical importance. This article reviews light trapping with metallic nanostructures for thin film solar cells and selective solar absorbers. The metallic nanostructures can either be used in reducing material thickness and device cost or in improving light absorbance and thereby improving conversion efficiency. The metallic nanostructures can contribute to light trapping by scattering and increasing the path length of light, by generating strong electromagnetic field in the active layer, or by multiple reflections/absorptions. We have also discussed the adverse effect of metallic nanostructures and how to solve these problems and take full advantage of the light-trapping effect. INTRODUCTIONThe conversion of solar energy to electricity or heat might be the ultimate means to help solve the energy crisis when hydrocarbon resources such as coal and other fossil fuels cannot satisfy the energy demand. Solar energy is abundant, ,5000 times our current power consumption.1 The use of solar energy can also reduce the environmental problems caused by the consumption of fossil fuels by reducing dusts, noxious gases and greenhouse gases, as well as the resulting haze, acid rain and global warming. To date, the worldwide installed capacity of solar harvesting devices is ,60 GW in electric energy and ,300 GW in thermal energy, 2 with an annual rapid increase. For the existing technology, there is room for further improvement by either enhancing the light absorption or avoiding loss of electricity or heat after absorption. Recently, new advances in nanotechnology and material fabrication methods have resulted in an emerging field of plasmonics by properly introducing metallic nanostructures to manipulate light, enabling light trapping in active layers and thereby enhancing the performance of energy-harvesting devices.3 In addition, certain highly absorbing surfaces or structures with broadband absorption promising to extend the working wavelength of the solar energy spectrum (Figure 1) have been realized. The light-trapping effect, however, allows the thickness of materials and the costs of solar cells to decrease, which in turn benefits electricity collection when the minor carrier diffusion length in the active layer is not sufficiently long.In this review, we focus on light trapping induced by metallic nanostructures for solar energy collection. Corresponding applications are not only for photovoltaics, but also for solar thermal. In fact, solar thermal has a market with profit even higher than photovoltaics, yet

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“…Texieria et al [18] found a doubling of efficiency for an unglazed flat plate operating at a temperature difference of 70 0 C and solar irradiation of 1000 W/m 2 using selective surfaces as opposed to non-selective surfaces. This design's greatest enhancement was the addition of a selective surface as opposed to changing the absorber shape or adding glazing or additional insulation.…”

Section: Figure 5 Configuration Of Impinging Fins Used By Hachemi [17]mentioning

confidence: 99%

A Review of Solar Air Heater With Close Water Open Air (Cwoa) for Humidification-Dehumidification Process

2016

IJAERD

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the total cost of a humidification-dehumidification system and so the development of a cost effective and efficient solar collector is essential to the system's overall feasibility [1]. Considering the importance of solar air heaters to the overall performance and cost of HDH air-heating systems, they are reviewed in the current paper , which is defined as the useful heat gain of the air stream (in watts) divided by the solar irradiation incident on the collector (also in watts), Heat gained by air

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Spectrally selective composite coatings of Cr–Cr2O3 and Mo–Al2O3 for solar energy applications

Cited by 129 publications

References 10 publications

A review of cermet-based spectrally selective solar absorbers

A review of cermet-based spectrally selective solar absorbers

Metallic nanostructures for light trapping in energy-harvesting devices

A Review of Solar Air Heater With Close Water Open Air (Cwoa) for Humidification-Dehumidification Process

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