Sputter deposition of Mo-alumina cermet solar selective coatings: Interrelation between residual oxygen incorporation, structure and optical properties

Becerril-Gonzalez, J.J.; Castro-Chong, Alejandra; Oskam, Gerko; Arés-Muzio, O.

doi:10.1088/2053-1591/ac3042

Cited by 3 publications

(1 citation statement)

References 53 publications

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“…28 A thin Mo overlayer was deposited by RF sputtering onto the TiO 2 -coated FTO substrates using a rectangular magnetron sputtering gun (Gencoa SW50200) and a rectangular Mo target (5 cm × 20 cm) of a purity of 99.95%. The optimized sputtering parameters corresponded to an RF power density applied to the target of 6 W cm −2 and an argon pressure in the chamber of 0.3 Pa, following the procedure described by Becerril-Gonzalez et al 29 The metallic Mo overlayer was oxidized using the following heating ramp program: starting at room temperature, the temperature was increased by 100 °C steps each hour until reaching 600 °C where the temperature was maintained for 1 h, allowing to cool to room temperature after deposition. XRD grazing angle studies showed the presence of a molybdenum oxide, MoO x , in composition close to MoO 3 .…”

Section: Experimental Methodsmentioning

confidence: 99%

Charge Dynamics at Surface-Modified, Nanostructured Hematite Photoelectrodes for Solar Water Splitting

Vega-Poot¹,

Rodríguez-Pérez²,

Becerril-González³

et al. 2022

J. Electrochem. Soc.

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The balance of the charge transfer and recombination kinetics of photoelectrodes governs device efficiency for solar water splitting. Hematite (α-Fe2O3) is a photoanode typically used because of advantages such as its abundance, low cost, multiple convenient deposition methods, and an attractive bandgap energy. However, poor electrical properties prevent high solar energy to hydrogen conversion efficiencies. In this work, we evaluate and compare several strategies to address this issue, using a nanorod array morphology and incorporation of overlayers of one or more materials that favor the charge carrier transfer kinetics and reduce surface recombination. We use intensity-modulated photocurrent spectroscopy (IMPS) to evaluate these systems, and demonstrate that the presence of TiO2 and MoOx overlayers successfully suppresses surface recombination through passivation of hematite interfacial recombination sites. However, the hole transfer process at the overlayers occurs at more positive potentials due to the location of the new surface states at the overlayer – electrolyte interface. We show that the deposition of the CoPi oxygen evolution reaction co-catalyst partially addresses this disadvantage. The best efficiencies were obtained for the CoPi-TiO2/α−Fe2O3 and CoPi-MoOx/TiO2/α−Fe2O3 photoelectrodes, with internal quantum efficiencies of 0.42−0.44 under 455 nm irradiation.

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Section: Experimental Methodsmentioning

confidence: 99%

Charge Dynamics at Surface-Modified, Nanostructured Hematite Photoelectrodes for Solar Water Splitting

Vega-Poot¹,

Rodríguez-Pérez²,

Becerril-González³

et al. 2022

J. Electrochem. Soc.

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A Spray-Deposited Modified Silica Film on Selective Coatings for Low-Cost Solar Collectors

Lizama-Tzec,

Cetina-Dorantes,

Herrera-Zamora

et al. 2024

Coatings

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Solar collectors represent an attractive green technology for water heating, where sunlight is efficiently absorbed by a selective coating and the generated heat is transferred to water. In this work, the improvement and scale-up of an electrodeposited black nickel selective coating with a modified silica (MS) film deposited by spray pyrolysis are reported. The MS material was prepared by the sol–gel method using tetraethyl orthosilicate with the addition of n-propyl triethoxysilane to obtain a porous film with an adequate refractive index and enhanced flexibility. The reflectance of electrodeposited selective coatings was characterized with and without the MS film and compared to a commercially available coating of black paint. The MS film increased the solar absorptance from 89% to 93% while maintaining a much lower thermal emittance than the painted coating. The reflectance of the MS film remained unchanged after prolonged thermal treatment at 200 °C (200 h). The fabrication process was scaled up to 193 cm × 12 cm copper fins, which were incorporated in commercial-size flat-plate solar collectors. Three complete collectors of an area of 1.7 m2 were fabricated and their performance was evaluated under outdoor conditions. The results show that the electrodeposited selective coating with the MS film outperformed both the commercial black paint system and the system without the modified silica film.

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Materials Based on Amorphous Al2O3 and Composite W-Al2O3 for Solar Coatings Deposited by High-Rate Sputter Processes

Diletto

D’Angelo

Esposito

et al. 2023

Solar

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In parabolic trough technology, the development of thermally and structurally stable solar coatings plays a key role in determining the efficiency, durability, and economic feasibility of tube receivers. A cermet-based solar coating is typically constituted by a thin film stratification, where a multilayer graded cermet is placed between an infrared metallic reflector and an antireflection filter. This work reports the realization of materials based on Al2O3 and W characterized by high structural and chemical stability in vacuum at high temperature, obtained through the optimization of high-deposition-rate processes. Al2O3 material, employed as the antireflection layer, was deposited through a reactive magnetron sputtering process at a high deposition rate. Cermet materials based on W-Al2O3 were deposited and employed as absorber layers by implementing reactive magnetron co-sputtering processes. An investigation into the stability of the realized samples was carried out by means of several material characterization methods before and after the annealing process in vacuum (1 × 10−3 Pa) at high temperature (620 °C). The structural properties of the samples were evaluated using Raman spectroscopy and XRD measurements, revealing a negligible presence of oxides that can compromise the structural stability. Spectrophotometric analysis showed little variations between the deposited and annealed samples, clearly indicating the high structural stability.

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Sputter deposition of Mo-alumina cermet solar selective coatings: Interrelation between residual oxygen incorporation, structure and optical properties

Cited by 3 publications

References 53 publications

Charge Dynamics at Surface-Modified, Nanostructured Hematite Photoelectrodes for Solar Water Splitting

Charge Dynamics at Surface-Modified, Nanostructured Hematite Photoelectrodes for Solar Water Splitting

A Spray-Deposited Modified Silica Film on Selective Coatings for Low-Cost Solar Collectors

Materials Based on Amorphous Al2O3 and Composite W-Al2O3 for Solar Coatings Deposited by High-Rate Sputter Processes

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