Structural, optical and NO2 gas sensing properties of ZnMgO thin films prepared by the sol gel method

Chebil, W.; Boukadhaba, M.A.; Madhi, I.; Fouzri, A.; Lusson, A.; Vilar, Christèle; Sallet, Vincent

doi:10.1016/j.physb.2016.10.028

Cited by 18 publications

(6 citation statements)

References 42 publications

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“…Recently, ZnO as an n-type semiconductor, with a high exciton binding energy (60 meV) and a wide bandgap (3.37 eV), 1 has attracted great attention due to its potential applications in di®erent electronic and optoelectronic¯elds such as ultraviolet (UV) photodetectors, light-emitting diodes (LEDs), laser diodes (LDs), transparent conducting electrodes, catalysts and gas sensors. [2][3][4][5][6][7][8][9][10][11][12] So, it is required that ZnO must possess improved electrical and optical properties for such applications. Doping of ZnO with group-II elements such as Mg will enhance its electrical and optical properties.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, Madahi et al 24 reported that ZnO:Mg thin¯lms showed excellent antibacterial activity, which was enhanced by doping with Mg. Besides, Chebil et al 10 reported in their work on Mg-doped ZnO prepared by sol-gel that the preferential orientation along the c-axis disappeared in ZnMgO thin¯lms, and the crystallite size, the optical bandgap and the surface roughness increased by Mg doping. Also, Mia et al 25 demonstrated in their work on Mg-doped ZnO thin lm of 200 nm thickness which was fabricated by solgel spin coating method, that the sharp absorption edge exhibited blueshifts and the crystallite size increased with the increase of Mg content.…”

Section: Introductionmentioning

confidence: 99%

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STUDIES ON STRUCTURAL, SURFACE MORPHOLOGICAL, OPTICAL, LUMINESCENCE AND UV PHOTODETECTION PROPERTIES OF SOL–GEL Mg-DOPED ZnO THIN FILMS

et al. 2019

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Undoped and magnesium-doped zinc oxide thin films were prepared by the sol–gel method. Results from X-ray diffraction indicated that the films exhibited a hexagonal wurtzite structure and were highly oriented along the [Formula: see text]-axis. The intensity of the (002) diffraction peak increased with increasing the Mg doping concentration. Also, Mg doping inhibited the growth of crystallite size which decreased from 46[Formula: see text]nm to 38[Formula: see text]nm with doping concentration. Morphological studies by atomic force microscopy (AFM) indicated the uniform thin film growth and the decreasing of grain size and surface roughness with Mg doping. Optical analysis showed that the average transmittance of all films was above 90% in the visible range and Mg doping has significantly enhanced the bandgap energy of ZnO. Two Raman modes assigned to [Formula: see text] and [Formula: see text] for the ZnO wurtzite structure were observed for all films. UV emission peak and three defect emission peaks in the visible region were observed by photoluminescence measurements at room temperature. The intensity ratio of UV emission to the visible emission increased with the Mg concentration. Photocurrent measurements revealed that all films presented the photoresponses with [Formula: see text]-type semiconducting behavior and their generated photocurrents were reduced by Mg doping. The prepared thin films of high quality with improved properties by Mg doping could be proposed to workers in the field of optoelectronic devices for using them as a strong candidate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

STUDIES ON STRUCTURAL, SURFACE MORPHOLOGICAL, OPTICAL, LUMINESCENCE AND UV PHOTODETECTION PROPERTIES OF SOL–GEL Mg-DOPED ZnO THIN FILMS

et al. 2019

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“…Pure ZnO and ZnCaO thin layers were synthesized by sol-gel method and deposited by spin coating on p-Si (001) substrates. The sample preparation procedure is similar to that previously described in details in our recent published works [32]. In our case we only change the source of dopant and we have used calcium acetate hydrate C4H6CaO5 (sigma-Aldrich, 99.9%).…”

Section: Preparation Of Zn1-xcaxo Thin Filmsmentioning

confidence: 99%

Characterization of sol gel Zn1-xCaxO thin layers deposited on p-Si substrate by spin-coating method

et al. 2020

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Thin films Zn1-xCaxO (0≤x≤6%) on a p-Si substrate are elaborated by sol-gel process and spin coating. X-ray diffraction displays a hexagonal wurtzite structure with an increase of lattice parameters confirming the substitution of Zn 2+ by Ca 2+ . The estimation of crystallite sizes along the three main crystallographic planes is practically constant (22 nm) suggesting a spherical symmetry shape of the crystallites which is confirmed by SEM. UV-visible reflectance spectra attest a band gap tuning from 3.144 to 3.262 eV which is confirmed by the PL measurement at 2 K for Zn0.94Ca0.06O sample by the appearance of a broad band around 3.508 eV. Although the luminescence of the samples is weak, we well distinguish the free exciton emission (FXA ) positioned at 3.376 eV and the bound exciton recombination (D 0 X) around 3.362 eV.

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“…Various techniques have been used for the preparation of ZnMgO films such as radio-frequency plasma-assisted molecu-lar beam epitaxy (RF-MBE) [2,7,10,11], DC [12,13] and RF [1,3,6] magnetron sputtering, pulsed laser deposition (PLD) [14,15], plasma-enhanced atomic layer deposition (PE-ALD) [16], chemical vapor deposition (CVD) [17], metal-organic chemical vapor deposition (MOCVD) [18,19], hydrothermal [4], chemical bath deposition (CBD) [20], sol-gel spin coating [21][22][23][24][25][26][27][28][29], and spray pyrolysis [28][29][30][31][32][33][34]. Among these techniques, the sol-gel spin coating method has the advantage of ensuring easy control and handling of chemicals and substrates, as well as excellent control over stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

“…The films are prepared on various substrates such as ZnO [6], MgO [17], Si [2][3][4]23], CaF 2 [12], Al 2 O 3 [18], sapphire [7,10,11,[13][14][15][16]19,31,32], glass and quartz [1,20,21,[23][24][25][26][27][28][29][30]33,34]. The choice of the substrate is determined by the application.…”

Section: Introductionmentioning

confidence: 99%

Band tail state related photoluminescence and photoresponse of ZnMgO solid solution nanostructured films

Morari¹,

Pantazi²,

Curmei³

et al. 2020

Beilstein J. Nanotechnol.

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A series of Zn1− x Mg x O thin films with the composition range x = 0.00–0.40 has been prepared by sol–gel spin coating on Si substrates with a post-deposition thermal treatment in the temperature range of 400–650 °C. The morphology of the films was investigated by scanning electron microscopy and atomic force microscopy while their light emission properties were studied by photoluminescence spectroscopy under excitation at 325 nm. It was found that annealing at 500 °C leads to the production of macroscopically homogeneous wurtzite phase films, while thermal treatment at higher or lower temperature results in the degradation of the morphology, or in the formation of ZnO particles embedded into the ZnMgO matrix, respectively. Local compositional fluctuations leading to the formation of deep band tails in the gap were deduced from photoluminescence spectra. A model for the band tail distribution in the bandgap is proposed as a function of the alloy composition. Thin films were also prepared by aerosol spray pyrolysis deposition using the same sol–gel precursors for the purpose of comparison. The prepared films were tested for photodetector applications.

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Structural, optical and NO2 gas sensing properties of ZnMgO thin films prepared by the sol gel method

Cited by 18 publications

References 42 publications

STUDIES ON STRUCTURAL, SURFACE MORPHOLOGICAL, OPTICAL, LUMINESCENCE AND UV PHOTODETECTION PROPERTIES OF SOL–GEL Mg-DOPED ZnO THIN FILMS

STUDIES ON STRUCTURAL, SURFACE MORPHOLOGICAL, OPTICAL, LUMINESCENCE AND UV PHOTODETECTION PROPERTIES OF SOL–GEL Mg-DOPED ZnO THIN FILMS

Characterization of sol gel Zn1-xCaxO thin layers deposited on p-Si substrate by spin-coating method

Band tail state related photoluminescence and photoresponse of ZnMgO solid solution nanostructured films

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