Spectroscopic ellipsometry and magneto-transport investigations of Mn-doped ZnO nanocrystalline films deposited by a non-vacuum sol–gel spin-coating method

Shaaban, E.R.; El-Hagary, M.; Emam-Ismail, M.; Matar, A.; Yahia, I.S.

doi:10.1016/j.mseb.2012.11.005

Cited by 32 publications

(14 citation statements)

References 31 publications

(35 reference statements)

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“…The lattice distortions formed after adding dopant ions with different ionic radii into ZnO lattice are the main causes of the observed increase in the average crystallite size. 18 On the basis of the observed results, the effect of Mn-, Co-, and Cu-doping on the crystallite structure of ZnO was further investigated, and the lattice parameters for all the ZnO products were calculated using eq 1. 22 where h , k , and l are the Miller indices; a and c are the lattice constants; and d is the interplanar spacing, which can be determined from Bragg’s law…”

Section: Results and Discussionmentioning

confidence: 99%

“…The insets of Figure depict the high-resolution diffraction peaks of both undoped and doped ZnO that correspond to the (101) plane where a noticeable shift to lower 2θ angles with the addition of various dopant ions can be clearly seen. The observed shift of the diffraction peak positions toward lower 2θ angles indicates partial substitution of Mn 2+ (0.8 Å), Co 2+ (0.74 Å), and Cu 2+ (0.73 Å) into the Zn 2+ lattice with an ionic radii of 0.74 Å, which leads to lattice expansion. − The average crystallite sizes of both the undoped and metal-doped ZnO samples were also determined by measuring the full width at half-maximum of the intense diffraction peak associated with the (101) plane using the Debye–Scherer formula . As mentioned in Table , the average crystallite sizes were found to increase from 14.71 nm of undoped ZnO to 16.53, 21.59, and 24.61 nm of Co-, Mn-, and Cu-doped ZnO, respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

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Hierarchically Porous Cu-, Co-, and Mn-Doped Platelet-Like ZnO Nanostructures and Their Photocatalytic Performance for Indoor Air Quality Control

et al. 2019

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Several parameters, including specific surface area, morphology, crystal size, and dopant concentration, play a significant role in improving the photocatalytic performance of ZnO. However, it is still unclear which of these parameters play a significant role in enhancing the photocatalytic activity. Herein, undoped and Mn-, Co-, and Cu-doped platelet-like zinc oxide (ZnO) nanostructures were synthesized via a facile microwave synthetic route, and their ultraviolet (UV) and visible-light-induced photocatalytic activities, by monitoring the gaseous acetaldehyde (CH3CHO) degradation, were systematically investigated. Both the pure and doped ZnO nanostructures were found to be UV-active, as the CH3CHO oxidation photocatalysts with the Cu-doped ZnO one being the most UV-efficient photocatalyst. However, upon visible light exposure, all ZnO-nanostructured samples displayed no photocatalytic activity except the Co-doped ZnO, which showed a measurable photocatalytic activity. The latter suggests that Co-doped ZnO nanostructures are potent candidates for several indoor photocatalytic applications. Various complementary techniques were utilized to improve the understanding of the influence of Mn-/Co-/Cu-doping on the photocatalytic performance of the ZnO nanostructures. Results showed that the synergetic effects of variation in morphology, surface defects, that is, VO, high specific surface areas, and porosity played a significant role in modulating the photocatalytic activity of ZnO nanostructures.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Hierarchically Porous Cu-, Co-, and Mn-Doped Platelet-Like ZnO Nanostructures and Their Photocatalytic Performance for Indoor Air Quality Control

et al. 2019

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“…The mixed powders pressed into a disk-shape pellet used as the starting constituents of the prepared semiconducting thin films. In our previous studies [17][18][19][20][21] different compounds has been prepared using the same technique. Using a conventional coating unit (Denton Vacuum DV 502 A) and at a pressure of about 10-6 Pa, the compositions of CdSe1-xSx (with 0 ≥ x ≥1) thin films were deposited by thermally evaporating the powdered samples from a resistance heating quartz glass crucible onto the dried pre-cleaned glass substrates.…”

Section: Methodsmentioning

confidence: 99%

Characterization of Thermally Evaporated CdSe1-XSX Thin Films for Solar Cells Applications

Abdelrahman

2018

JAP

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Binary semiconductor CdSe and CdS thin films are widely used for optoelectronic devices and window materials. The formation of ternary CdSe1-xSx thin films improves the physical characteristics of the binary CdSe thin films. The importance of CdSe1-xSx thin film is the change of band gap when incorporating S into the CdSe. This change in energy gap recommends CdSe1-xSx thin film for photovoltaic and photoconductive cells applications. In this work, polycrystalline CdSe1-xSx thin films have been grown in terms of thermal evaporation technique. X-ray diffractometry has been used to determine the lattice parameters and the crystallite size of the CdSe1-xSx mixed crystals. The variation in lattice parameters with composition from x = 0 to x = 1 were linearly. The crystallite size varies parabolically with the change in composition. The energy gap, opt g E , values of CdSe1-xSx thin films were estimated in terms of first derivative of absorbance with respect to wavelength and found to be increased with the formation of the ternary compound Cd-Se-S and with increasing the S content as expense of Se. This wider energy gap of the prepared films, which permits extra light to reach the solar cell junction, was correlated with the change in the microstructure parameters of thin films.

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“…SE apparatus has a revolving optical compensator and is also operational with a programmed retarder. The SE spectra is measured in the angular range 60 o -75° with 5 o steps [33,34,35].…”

Section: Characterization Techniquesmentioning

confidence: 99%

“…79-0205. This behavior was given in literature for ZnO doped Mn [37] and ZnO doped Cu thin films [38]. In addition, the nanostructure nature of the films is examined by using Debye-Scherrer's equations from the calculations of the mean crystallite sizes,…”

Section: Elemental Composition Analysismentioning

confidence: 99%

Effect of Cu Incorporation on Optoelectronic Properties of e-Beam Evaporated ZnO thin Films by Ellipsometric Investigations

Ali¹,

Moustafa²,

Amer³

et al. 2021

Preprint

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Electron beam deposition technique has been used to deposit a series of Zn1-xCuxO nanocrystalline thin film on silica substrate with a variety of Cu concentrations. The microstructural, surface morphology and spectroscopic ellipsometry (SE) were used to examine the physical properties of the deposited films. The nanocrystalline nature of the Zn1-xCuxO (0.0≤x≤0.20) thin film has been confirmed by surface morphology studies. The XRD spectrum of the Zn1-xCuxO nanocrystalline film showed a hexagonal wurtzite type structure, and no extra phase was detected. Our results show that as the Cu content increases, the direct optical energy gap Eg decreases without any sign of solubility limit up to x≤0.2. The decrease in Eg can be attributed to the sp-d exchange coupling. In addition, exploring the spectral behavior of the refractive index dispersion from SE of the Cu-doped ZnO shows that as the Cu dopant increments; the refractive index of the deposited film enhances. Further, understand the refractive index dispersion of the deposited film has been performed using a single oscillator model proposed by Wemple-DiDomenico (WDD). Our calculations show that as the Cu concentration increases, the values of oscillator energy Eo decreases however, the dispersion energy Ed increases. As a result, the variation of the optical energy band gap and the tunability of the dispersive oscillator parameters values Eo, Ed, n0, e0, M-1 and M-3 with the increase of the Cu doping level confirm that Cu doped ZnO films are a good candidate for optoelectronic device applications.

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Spectroscopic ellipsometry and magneto-transport investigations of Mn-doped ZnO nanocrystalline films deposited by a non-vacuum sol–gel spin-coating method

Cited by 32 publications

References 31 publications

Hierarchically Porous Cu-, Co-, and Mn-Doped Platelet-Like ZnO Nanostructures and Their Photocatalytic Performance for Indoor Air Quality Control

Hierarchically Porous Cu-, Co-, and Mn-Doped Platelet-Like ZnO Nanostructures and Their Photocatalytic Performance for Indoor Air Quality Control

Characterization of Thermally Evaporated CdSe1-XSX Thin Films for Solar Cells Applications

Effect of Cu Incorporation on Optoelectronic Properties of e-Beam Evaporated ZnO thin Films by Ellipsometric Investigations

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