Covellite CuS – Single crystal growth by chemical vapour transport (CVT) technique and characterization

Chaki, Sunil H.; Tailor, Jiten P.; Deshpande, M. P.

doi:10.1016/j.mssp.2014.07.038

Cited by 94 publications

(28 citation statements)

References 49 publications

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“…In order to identify the phase of the CuS nanoparticles, SAED was used for four different areas on the TEM-grid, which supports the hex-agonal space group of the CuS nanoparticles, whereas the diffraction rings match the literature value (hexagonal, space group P63/mmc, COD: 9008389) (Fig. 4) [82,83]. Fig.…”

Section: Characterization Of Nm@cus Compositesmentioning

confidence: 79%

Amino-functionalized MIL-101(Cr) photodegradation enhancement by sulfur-enriched copper sulfide nanoparticles: An experimental and DFT study

Abdpour

Kowsari

Bazri

et al. 2020

Journal of Molecular Liquids

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In the present work, a direct Z-scheme composite photocatalyst, NH2-MIL-101(Cr)@CuS, with high photodegradation efficiency of Rhodamine B (RhB) degradation in the visible light spectrum, is fabricated through a solvothermal method. It was found that the NH2-MIL-101(Cr)@CuS composite with an appropriate amount of NH2-MIL-101(Cr) exhibited high catalytic performance in the RhB photodegradation. The photocur-rent density and results from the electrochemical impedance spectroscopy (EIS) analysis confirm the promoted photocatalytic activity of the NH2-MIL-101(Cr)@CuS composite compared to the pristine MIL-101(Cr) and CuS nanoparticles, which were supported by the electron lifetime (τn) calculations for the samples. The trapping ex-periments and Mott-Schottky analysis revealed that the superoxide radicals (•O − 2) played an essential role in the photodegradation of RhB and the promoted photocatalytic activity contributed to a direct Z-scheme mechanism between CuS and NH2-MIL-101(Cr). Stability study also shows acceptable results during photocatalytic reaction. Furthermore, Density Functional Theory (DFT) calculations were performed to gain a better understanding of the electronic properties of the NH2-MIL-101(Cr)@CuS nanocomposite. The calculated band structures showed that the nanocomposite has a higher photocatalytic efficiency in the visible region compared to the pristine MIL-101 (Cr) and CuS. The calculated band gap of both the semiconductors and the hybrid nanocomposite confirms the experimental results.

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Section: Characterization Of Nm@cus Compositesmentioning

confidence: 79%

Amino-functionalized MIL-101(Cr) photodegradation enhancement by sulfur-enriched copper sulfide nanoparticles: An experimental and DFT study

Abdpour

Kowsari

Bazri

et al. 2020

Journal of Molecular Liquids

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“…The broad Raman peak in the low-frequency region corresponded to the mode of the lattice vibration produced by the Cu-S bonds [17]. Theoretical analysis revealed that a total of 36 vibrational modes are possible for the CuS system, and among them, 14 Raman active modes (Г Raman = 2A 1g + 4E 2g + 2E 1g ) can be categorized into Г Cu1 = A 1g + E 2g + E 1g , Г Cu2 = E 2g , Г S1 = A 1g + E 2g + E 1g , and Г S2 = E 2g for copper (Cu) and sulfur (S) each [1,18]. The covalent S-S bonds only exist in the copper-deficient Cu 2-x S (0.6 ≤ x ≤ 1) phases, so the strong band observed at 474 cm −1 is a typical peak characteristic that indicates the covellite CuS phase [19].…”

Section: Cus Thin-film Structural Propertiesmentioning

confidence: 99%

“…Copper sulfide (CuS) is a transition metal chalcogenide in the IB-VIA group. The material is a typical p-type semiconductor where holes are the major carrier, Cu 4s and S 3p hybridized states become the conduction-band minimum, and the Cu 3d and S 3p antibonding states become the valence-band maximum [1,2]. Most copper sulfide phases that show semiconductor behavior are reported to exist in four types, Cu 2−x S (digenite), Cu 1.96 S (djurleite), Cu 1.75 S (anilite), and CuS (covellite), which are crystallographically and stoichiometrically stable at room temperature [1,3].…”

Section: Introductionmentioning

confidence: 99%

Effect of RF Power on the Properties of Sputtered-CuS Thin Films for Photovoltaic Applications

et al. 2020

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Copper sulfide (CuS) thin films were deposited on a glass substrate at room temperature using the radio-frequency (RF) magnetron-sputtering method at RF powers in the range of 40–100 W, and the structural and optical properties of the CuS thin film were investigated. The CuS thin films fabricated at varying deposition powers all exhibited hexagonal crystalline structures and preferred growth orientation of the (110) plane. Raman spectra revealed a primary sharp and intense peak at the 474 cm−1 frequency, and a relatively wide peak was found at 265 cm−1 frequency. In the CuS thin film deposited at an RF power of 40 W, relatively small dense particles with small void spacing formed a smooth thin-film surface. As the power increased, it was observed that grain size and grain-boundary spacing increased in order. The binding energy peaks of Cu 2p3/2 and Cu 2p1/2 were observed at 932.1 and 952.0 eV, respectively. Regardless of deposition power, the difference in the Cu2+ state binding energies for all the CuS thin films was equivalent at 19.9 eV. We observed the binding energy peaks of S 2p3/2 and S 2p1/2 corresponding to the S2− state at 162.2 and 163.2 eV, respectively. The transmittance and band-gap energy in the visible spectral range showed decreasing trends as deposition power increased. For the CuS/tin sulfide (SnS) absorber-layer-based solar cell (glass/Mo/absorber(CuS/SnS)/cadmium sulfide (CdS)/intrinsic zinc oxide (i-ZnO)/indium tin oxide (ITO)/aluminum (Al)) with a stacked structure of SnS thin films on top of the CuS layer deposited at 100 W RF power, an open-circuit voltage (Voc) of 115 mA, short circuit current density (Jsc) of 9.81 mA/cm2, fill factor (FF) of 35%, and highest power conversion efficiency (PCE) of 0.39% were recorded.

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“…for Cu x S films at 532 nm, sample at 0.6 J cm −2 presents the highest light absorbance in the visible range. When laser fluence is increased, a shoulder in the blue region appear due to quantum confinement effects in CuS nanomaterial [16]; this effect is more evident at 4.3 and 13.1 J cm −2 with a wavelength of 532 nm, in which there is a shoulder in the blue region and a slightly blue-shift due to quantum confinement effects of covellite or the free-carrier intra-band absorption [17][18][19].…”

Section: Raman Spectroscopy Analysismentioning

confidence: 99%

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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Covellite CuS – Single crystal growth by chemical vapour transport (CVT) technique and characterization

Cited by 94 publications

References 49 publications

Amino-functionalized MIL-101(Cr) photodegradation enhancement by sulfur-enriched copper sulfide nanoparticles: An experimental and DFT study

Amino-functionalized MIL-101(Cr) photodegradation enhancement by sulfur-enriched copper sulfide nanoparticles: An experimental and DFT study

Effect of RF Power on the Properties of Sputtered-CuS Thin Films for Photovoltaic Applications

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

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Covellite CuS – Single crystal growth by chemical vapour transport (CVT) technique and characterization

Cited by 94 publications

References 49 publications

Amino-functionalized MIL-101(Cr) photodegradation enhancement by sulfur-enriched copper sulfide nanoparticles: An experimental and DFT study

Amino-functionalized MIL-101(Cr) photodegradation enhancement by sulfur-enriched copper sulfide nanoparticles: An experimental and DFT study

Effect of RF Power on the Properties of Sputtered-CuS Thin Films for Photovoltaic Applications

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

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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