Low cerium doping investigation on structural and photoluminescence properties of sol-gel ZnO thin films

Chelouche, A.; Touam, Tahar; Tazerout, Mohand; Boudjouan, F.; Djouadi, D.; Doghmane, A.

doi:10.1016/j.jlumin.2016.09.061

Cited by 43 publications

(7 citation statements)

References 51 publications

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“…The blue emission at 448 nm was attributed to the electron transition from a shallow donor level of zinc interstitials (Zni) to the top of the valence band (VB) [ 41 ]. The green emission peak observed around 540 nm is due to the transitions from the oxygen vacancy (VO) level of ZnO NRs [ 42 ]. The presence of intrinsic defects in the ZnO lattice structure causes photoemissions in the green or yellow/orange/red spectral regime.…”

Section: Resultsmentioning

confidence: 99%

Effect of P2O5 Content on Luminescence of Reduced Graphene-Oxide-Doped ZnO–P2O5 Nano-Structured Films Prepared via the Sol–Gel Method

Vasiliu,

Filip,

Chilibon

et al. 2023

Materials

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A convenient and low-cost sol–gel approach for the one-step synthesis of ZnO–P2O5–rGO nanostructures with tuned bandgap and fluorescence was investigated. The obtained hybrid nanostructures exploit the properties of zinc oxide, graphene oxide and phosphorous oxide as promising candidates for a wide range of optoelectronic applications. A predominant amorphous structure, ZnO–P2O5–rGO, containing ZnO nanorods was evidenced by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The estimated size of the ZnO nanorods in nanostructures with P2O5 was noticed to decrease when the P2O5/ZnO ratio was increased. The presence of ZnO, P2O5 and rGO was confirmed by Fourier-transform infrared spectroscopy (FTIR) and Raman investigation. P2O5 was noticed to tune the bandgap and the fluorescence emissions of the nanostructured films, as estimated by UV–Vis–NIR and fluorescence spectroscopy, respectively. The electrical measurements performed at room temperature showed that the main influence on the film’s resistivity does not come from the 1% rGO doping but from the P2O5/ZnO ratio. It was found that a 10/90 molar ratio of P2O5/ZnO decreases the resistivity almost seven-fold compared with rGO-doped ZnO films.

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Section: Resultsmentioning

confidence: 99%

Effect of P2O5 Content on Luminescence of Reduced Graphene-Oxide-Doped ZnO–P2O5 Nano-Structured Films Prepared via the Sol–Gel Method

Vasiliu,

Filip,

Chilibon

et al. 2023

Materials

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“…The localised states of electron are introduced by Ce atoms with the bandgap region of ZnO. Such electron localised states lie in close vicinity to down edge of conduction band, thereby resulting in the nearby formed lowest unfilled molecular orbital and reduction of energy gap [27].…”

Section: *mentioning

confidence: 99%

“…The Ce doped ZnO films showed a significant increase in UV emission in PL due to the reduction of near band defect states originated by Ce incorporation, which was related to enhanced crystallinity [26]. The Ce-doped ZnO PL emission results revealed that as the Ce concentration increases, UV and visible emissions decrease significantly [27]. Undoped as well as Ce-doped ZnO both showed an increase in UV intensity and a broad green band, making it suitable for use in optoelectronic nanodevices [28].…”

Section: Introductionmentioning

confidence: 95%

Significance of microstrain in impacting band gap and photoluminescence behavior of Ce-doped ZnO thin films deposited via sol-gel process

Kumawat¹,

Chattopadhyay²,

Misra³

et al. 2023

Phys. Scr.

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The purpose of this study is to analyse the importance of micro-strain in affecting the band gap and photoluminescence (PL) intensity of sol-gel-spin-coated Ce-doped ZnO thin films on glass slides. The presence of the (100) plane in the fabricated thin film was discovered using X-ray diffraction thereby indicating the presence of strongly orientated monocrystalline ZnO hexagonal wurtzite phase. On doping with Ce, the micro-strain in the ZnO thin films changed from (2.49 – 4.84) x10-3, and the crystallite size ranged from 26.23 to 43.03 nm. UV-visible spectroscopy revealed that the optical transparency of the undoped and Ce-doped ZnO films was between 60 to 85 percent, however the doped films’ absorption dip was slightly shifted from 378 to 380 nm. For Ce-doped ZnO thin films, the increase in band gap values determined using Tauc's plot was in the range of 3.19 to 3.44 eV. No change in the peak of UV emission was visible in the PL emission spectra after Ce doping. The micro-strain brought on by doping ZnO with Ce controlled the decrease in PL intensity. On doping with Ce up to 3 at.%, PL intensity and micro-strain both reduced, then climbed till Ce 5 at.%, and ultimately declined when the Ce content was 6 at.%. According to studies using scanning electron microscopy, the undoped ZnO film morphology was characterised by spherical particles with rod-like growth structures. For 1, 2, 5, and 6 at.% Ce-doped ZnO thin films, this structure was changed to a nanorod-like structure with small nanorods attached to a long rod. But lengthy chain linkage structures were found in the event of 3 at.% Ce doping. The preceding results are discussed from a doping perspective.

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“…Such prospects have led to extensive studies of many aspects of Ce-doped ZnO (CZO), motivated by the interest in generating new and unique technologies for manufacturing high-quality doped nanomaterials to obtain enhanced catalysts. Due to the attractive properties and potential applications of CZO nanoparticles (NPs), a variety of preparation techniques have been reported, notable examples include, the electrospinning method [12], sonochemical synthesis [13], microwave-assisted synthesis [14], the combustion method [15], the vapor-solid method [16], the sol-gel method [17][18][19], the magnetron sputtering method [20], and many others [21][22][23][24]. However, most of the reported methods are time-consuming, require complicated equipment with expensive chemical precursors, and operate only under particular and controlled reaction conditions such as pH, growth time, concentration, atmosphere, etc.…”

Section: Introductionmentioning

confidence: 99%

ZnO Nanoparticles with Controllable Ce Content for Efficient Photocatalytic Degradation of MB Synthesized by the Polyol Method

et al. 2021

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This paper reports on the synthesis of Ce-doped ZnO (CZO) nanoparticles (NPs) by an alternative polyol method at low temperature. The method, facile and rapid, uses acetate-based precursors, ethylene glycol as solvent, and polyvinylpyrrolidone as capping agent. The effects of the Ce-doping concentration (ranging from 0 to 8.24 atomic%) on the structural, morphological, compositional, optical, luminescence, and photocatalytic properties of the NPs were investigated by several techniques. The structural findings confirmed that the CZO NPs have a typical hexagonal wurtzite-type structure with a preferred orientation along the (101) plane. The results obtained by Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM) revealed that the NPs size decreased (from ~30 to ~16 nm) with an increase in the Ce-doping concentration. Energy Dispersive X-Ray Spectroscopy (EDS) and High Resolution Transmission Microscopy (HRTEM) results confirmed the incorporation of Ce ions into the ZnO lattice. Ce-doping influences the photoluminescence (PL) emission compared to that of pure ZnO. The PL emission is related to the presence of different kinds of defects, which could take part in charge transfer and/or trapping mechanisms, hence playing an essential role in the photocatalytic activity (PCA). In fact, in this work we report an enhancement of PCA as a consequence of Ce-doping. In this sense, the best results were obtained for samples doped with 3.24 atomic%, that exhibited a photocatalytic degradation efficiency close to 99% after 60 min ultraviolet (UV) illumination, thus confirming the viability of Ce-doping for environmental applications.

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Low cerium doping investigation on structural and photoluminescence properties of sol-gel ZnO thin films

Cited by 43 publications

References 51 publications

Effect of P2O5 Content on Luminescence of Reduced Graphene-Oxide-Doped ZnO–P2O5 Nano-Structured Films Prepared via the Sol–Gel Method

Effect of P2O5 Content on Luminescence of Reduced Graphene-Oxide-Doped ZnO–P2O5 Nano-Structured Films Prepared via the Sol–Gel Method

Significance of microstrain in impacting band gap and photoluminescence behavior of Ce-doped ZnO thin films deposited via sol-gel process

ZnO Nanoparticles with Controllable Ce Content for Efficient Photocatalytic Degradation of MB Synthesized by the Polyol Method

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