Optical and electrical properties of NiO and Cu-doped NiO thin films synthesized by spray pyrolysis

Aftab, M.; Butt, M. Z.; Ali, Dilawar; Bashir, Furrukh; Khan, Taj Muhammad

doi:10.1016/j.optmat.2021.111369

Cited by 66 publications

(11 citation statements)

References 60 publications

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“…This can be due to the film crystallization, decreased defects of the films, and the increase of the crystallite sizes with the thermal treatments. Similar results have been reported in literature [ 1 , 10 , 40 ]. The decrease of the optical band gap and the shifting of the absorption edge to the higher wavelength with increasing annealing temperatures is reported for sol-gel NiO films [ 57 ].…”

Section: Resultssupporting

confidence: 93%

“…Figure 4 also manifests that the absorption edge of NiO x films is dependent on the thermal treatments, and it is red shifted. The optical band gap of sol-gel NiO x films is determined by Tuac’s plot, assuming direct transitions [ 1 ], namely the linear part of the (αhν) 2 curve is extrapolated toward the energy axis at (αhν) 2 = 0. The determined band gap values of NiO x films are in Figure 5 as a function of the annealing temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…Nickel oxide (NiO) is a remarkable semitransparent semiconducting material with a cubic rock salt-like structure with octahedral Ni 2+ and O 2 − sites [ 1 ]. Nickel oxide is one of the interesting p-type wide band gap semiconductors with excellent properties, including high chemical and mechanical stabilities, extreme stability in a broad range of temperatures, and a direct band gap [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

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Nickel Oxide Films Deposited by Sol-Gel Method: Effect of Annealing Temperature on Structural, Optical, and Electrical Properties

et al. 2022

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In our study, transparent and conductive films of NiOx were successfully deposited by sol-gel technology. NiOx films were obtained by spin coating on glass and Si substrates. The vibrational, optical, and electrical properties were studied as a function of the annealing temperatures from 200 to 500 °C. X-ray Photoelectron (XPS) spectroscopy revealed that NiO was formed at the annealing temperature of 400 °C and showed the presence of Ni+ states. The optical transparency of the films reached 90% in the visible range for 200 °C treated samples, and it was reduced to 76–78% after high-temperature annealing at 500 °C. The optical band gap of NiOx films was decreased with thermal treatments and the values were in the range of 3.92–3.68 eV. NiOx thin films have good p-type electrical conductivity with a specific resistivity of about 4.8 × 10−3 Ω·cm. This makes these layers suitable for use as wideband semiconductors and as a hole transport layer (HTL) in transparent solar cells.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nickel Oxide Films Deposited by Sol-Gel Method: Effect of Annealing Temperature on Structural, Optical, and Electrical Properties

et al. 2022

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“…where hv is the photon energy, α is the absorption coefficient i.e., α = 2.303A t , and β is the band edge. The n value can be 2 or 0.5 for a direct or indirect transition, respectively [46]. The values for the optical band gaps were found to be 1.…”

Section: Absorbance Studiesmentioning

confidence: 93%

“…the band edge. The n value can be 2 or 0.5 for a direct or indirect transition, respectively [46]. The values for the optical band gaps were found to be 1.34, 1.38, 2.14, and 2.20 eV for Cu31S16 (120 °C), (b) Cu31S16 (150 °C), (c) Cu7S4 (220 °C), and (d) Cu7S4 (250 °C), respectively (inserts).…”

Section: Absorbance Studiesmentioning

confidence: 99%

Photocatalytic Degradation of Tetracycline in Aqueous Solution Using Copper Sulfide Nanoparticles

et al. 2021

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In this paper, spherical-shaped pure phase djurleite (Cu31S16) and roxbyite (Cu7S4) nanoparticles were prepared by a solvothermal decomposition of copper(II) dithiocarbamate complex in dodecanthiol (DDT). The reaction temperature was used to control the phases of the samples, which were represented as Cu31S16 (120 °C), Cu31S16 (150 °C), Cu7S4 (220 °C), and Cu7S4 (250 °C) and were characterized by using X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), and absorption spectroscopy. The samples were used as photocatalysts for the degradation of tetracycline (TC) under visible light irradiation. The results of the study showed that Cu7S4 (250 °C) exhibited the best activity in the reaction system with the TC degradation rate of up to 99% within 120 min of light exposure, while the Cu31S16 (120 °C) system was only 46.5% at the same reaction condition. In general, roxbyite Cu7S4 (250 °C) could be considered as a potential catalyst for the degradation of TC in solution.

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PVDF-based (V2O5)x. (Mn0.4Fe2.6O4)(2−x), x = [0.2, 0.4, 0.6, 0.8, and 1] nanocomposites for tailoring the optical and nonlinear optical properties of PVDF

2023

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Nanocomposites comprising (V2O5)x. (Mn0.4Fe2.6O4)(2−x), where x = [0.2, 0.4, 0.6, 0.8, and 1], were successfully synthesized by milling each single phase of V2O5 and Mn0.4Fe2.6O4 nanostructured samples. We studied the structure and morphology of the prepared samples through X-ray diffraction and scanning electron microscopy. UV–Vis. spectrum analysis was used to study the optical characteristics. As an attempt to improve the optical and nonlinear optical properties of the PVDF blend, the prepared nanocomposites were used as nanofillers for the poly (vinylidene fluoride) (PVDF) polymer. Optical and nonlinear optical properties of the PVDF polymer were tuned using (V2O5)x. (Mn0.4Fe2.6O4)(2−x), where x = [0.2, 0.4, 0.6, 0.8, and 1] nanocomposite. The obtained results showed a tunable spectrum, absorption, refractive index, and dielectric constant at wavelengths ranging from 200 to 800 nm. However, the results showed that the (V2O5)0.6. (Mn0.4Fe2.6O4)1.4, sample was the best for obtaining the lowest transmittance percentage and bandgap energy. The nonlinear optical properties and Kerr effect (quadratic electro-optic effect) showed a significant response, which can be tuned in the range from 200 to 1200 nm of wavelength using the investigated samples. Finally, incorporating (V2O5)x. (Mn0.4Fe2.6O4)(2−x), where x = [0.2, 0.4, 0.6, 0.8, and 1], nanoparticles in the PVDF polymer improved the hydrophilic behavior of the PVDF films. This study suggests a promising nanocomposite material for tunable optoelectronics and useful polymer membranes.

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Optical and electrical properties of NiO and Cu-doped NiO thin films synthesized by spray pyrolysis

Cited by 66 publications

References 60 publications

Nickel Oxide Films Deposited by Sol-Gel Method: Effect of Annealing Temperature on Structural, Optical, and Electrical Properties

Nickel Oxide Films Deposited by Sol-Gel Method: Effect of Annealing Temperature on Structural, Optical, and Electrical Properties

Photocatalytic Degradation of Tetracycline in Aqueous Solution Using Copper Sulfide Nanoparticles

PVDF-based (V2O5)x. (Mn0.4Fe2.6O4)(2−x), x = [0.2, 0.4, 0.6, 0.8, and 1] nanocomposites for tailoring the optical and nonlinear optical properties of PVDF

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