Effect of the stoichiometry of CuxS thin films on the optical and electrical properties and the solar thermal performance

Cuevas, Ana; Romero, R.; Leinen, D.; Dalchiele, Enrique A.; Ramos-Barrado, J.R.; Martı́n, Francisco

doi:10.1016/j.solmat.2014.11.048

Cited by 34 publications

(11 citation statements)

References 51 publications

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“…The precursor solution for CuS consisted of two separate aqueous solutions of 0.04 M thiourea (99%) and 0.01 M cooper (II) acetate (98%). Further details on the spray process can be found elsewhere . The precursor solution for ZrO 2 was 0.02 M zirconium acetyl acetonate (99%) and 0.01 M acetic acid (99.7%) in pure water.…”

Section: Methodssupporting

confidence: 93%

“…In solar energy photothermal applications, a selective surface must be used as an absorber for an efficient solar energy collection, i.e., a surface that absorbs solar radiation at wavelengths bellow 2 µm and does not irradiate energy above 2 µm because of its working temperature in a solar collector . In a previous study we have shown that the stoichiometry of copper sulfide films deposited onto glass by spray pyrolysis can be adequately tuned for solar light absorption. Thus, depositing those films onto highly reflecting metal substrates, solar selective properties should be achieved.…”

Section: Introductionmentioning

confidence: 99%

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Spectrally selective CuS solar absorber coatings on stainless steel and aluminum

Cuevas

Romero

Dalchiele

et al. 2016

Surface & Interface Analysis

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CuS and ZrO2/CuS thin films have been deposited at 200 °C in ambient atmosphere by spray pyrolysis onto stainless steel S304 and aluminum AA1050 sheets in order to be used as prospective solar absorbers for thermal energy harvesting. Zirconia has been deposited as a top layer working as an antireflection coating increasing the solar absorption and protecting the underlying copper sulfide layer, which works as the solar light absorbing material. Solar selectivity of the samples was evaluated measuring the total hemispherical reflectivity in the ultraviolet‐visible infrared range and calculating solar absorptance and thermal emittance. The solar selectivity was optimized by tuning the film thickness of the coating stack. X‐ray diffraction, SEM and X‐ray photoelectron spectroscopy analyses have been used to proof crystal phase, coverage, film thickness, and surface contamination of optimized samples, revealing that the copper sulfide film is CuS covellite and the optimized film thicknesses are in the range of 50 nm for the ZrO2 top layer and 140 nm for the CuS layer. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Methodssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Spectrally selective CuS solar absorber coatings on stainless steel and aluminum

Cuevas

Romero

Dalchiele

et al. 2016

Surface & Interface Analysis

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“…The absorption coefficient (α) was calculated from equation [16,18]. In fact, these values are similar to the reported for amorphous CuS thin films; most of the Cu x S films grown in the present work, show the same behavior as XRD patterns indicate [20].…”

Section: Optical Propertiessupporting

confidence: 86%

Effect of laser fluence on structural and optical properties of Cu_xS films grown by pulsed laser deposition at different wavelengths

Rodríguez‐Hernández¹,

Quiñones-Galván²,

Meléndez‐Lira³

et al. 2020

Mater. Res. Express

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Cu x S thin films were grown onto soda-lime glass substrates by pulsed laser deposition at two different wavelengths: 1064 and 532 nm. X-ray diffraction, Raman and UV-vis spectroscopies were used to characterize the Cu x S films. Results are presented as a function of laser fluence. XRD patterns indicate that covellite and chalcocite phases were obtained. Raman spectra showed that chalcocite is the predominant phase in the crystalline samples. Optical band gap values are between 2.29 and 2.74 eV for ablation with 1064 nm wavelength; meanwhile, for 532 nm band gap values varied from 2.24 to 2.66 eV; which are in the range of expected values for Cu x S films. At 1064 nm and 4.4 J cm −2 sample presented the highest optical absorbance in the visible range, which corresponds to the highest thickness. These are the best growth parameters for Cu x S films in order to be used as absorber films for solar cells applications.

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“…As can be observed, the RMS roughness increases with the number of cycles. The value for the substrate was 4.1 nm and those of the CuS films were between 9.0 and 13.7 nm, these values are commonly reported for CuS films …”

Section: Resultsmentioning

confidence: 99%

Deposition of Highly Crystalline Covellite Copper Sulphide Thin Films by SILAR

Ramírez-Esquivel

Mazón-Montijo

Aguirre-Tostado

2017

Physica Status Solidi (a)

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Thin films of the covellite phase of CuS are of special importance due to their properties for optoelectronic device applications. Their preparation by chemical solution methods could enable their deposition on flexible substrates at low temperature for large area applications. Successive Ionic Layer Adsorption and Reaction (SILAR) is a promising option because it is simple, inexpensive, and allows the control of thickness and composition. However, low crystalline CuS thin films have been reported so far. In this work, highly polycrystalline CuS thin films were successfully grown at room temperature by SILAR using CuSO4 and Na2S as the ionic solutions without post‐deposition annealing. The films obtained at different SILAR cycles resulted in good appearance, uniformity, well adhered to the substrate, and presented the covellite structure as the predominant crystalline phase. X‐ray diffraction analysis showed important details about the films growth evolution, which were in agreement with results from atomic force microscopy and ellipsometry. All the films exhibited low electrical resistivity in agreement with the metallic behavior observed in the infrared region of their transmittance spectra. These results demonstrate a direct method of obtaining highly polycrystalline CuS thin films at low temperature, which could open a new range of applications.

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Effect of the stoichiometry of CuxS thin films on the optical and electrical properties and the solar thermal performance

Cited by 34 publications

References 51 publications

Spectrally selective CuS solar absorber coatings on stainless steel and aluminum

Spectrally selective CuS solar absorber coatings on stainless steel and aluminum

Effect of laser fluence on structural and optical properties of Cu_xS films grown by pulsed laser deposition at different wavelengths

Deposition of Highly Crystalline Covellite Copper Sulphide Thin Films by SILAR

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Effect of the stoichiometry of CuxS thin films on the optical and electrical properties and the solar thermal performance

Cited by 34 publications

References 51 publications

Spectrally selective CuS solar absorber coatings on stainless steel and aluminum

Spectrally selective CuS solar absorber coatings on stainless steel and aluminum

Effect of laser fluence on structural and optical properties of CuxS films grown by pulsed laser deposition at different wavelengths

Deposition of Highly Crystalline Covellite Copper Sulphide Thin Films by SILAR

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Product

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Effect of laser fluence on structural and optical properties of Cu_xS films grown by pulsed laser deposition at different wavelengths