Combined influence of fluorine doping and vacuum annealing on the electrical properties of ZnO:Ta films

Subha, K.; Ravichandran, K.; Sriram, S.

doi:10.1016/j.apsusc.2017.02.233

Cited by 10 publications

(4 citation statements)

References 67 publications

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“…The effect of both the decreased grain size and the change in the shape of the crystals in the ZnO:Ta-doped films was also observed and reported by different authors [40,41,[56][57][58], and it was in agreement with our experiments. This effect could be owing to the fact that tantalum atoms create a EDS results on Ta-doped ZnO samples (Figure 10b) indicate that it was a Zn-rich ZnO material, but there was also a clear contribution of the tantalum element around of 0.1% and 0.15% in atomic percentage (±0.5% in weight), this could be owing to the fact that tantalum atoms are mainly incorporated inside the lattice of ZnO, but no over surface of the structures obtained.…”

Section: Sem and Eds Studiessupporting

confidence: 93%

“…The effect of both the decreased grain size and the change in the shape of the crystals in the ZnO:Ta-doped films was also observed and reported by different authors [40,41,[56][57][58], and it was in agreement with our experiments. This effect could be owing to the fact that tantalum atoms create a compression stress inside the lattice of ZnO, and they prevents an increase in these big shapes, as generated by the difference of ionic radii between Zn and Ta, as commented before in the XRD results.…”

Section: Sem and Eds Studiessupporting

confidence: 93%

“…The mobility (Figure 13a) initially increased, with Ta 2 O 5 reaching a maximum value in the film fabricated with 50 mg of Ta 2 O 5 in the source; after that, it started to decrease. This effect has also been observed by Subha et al [57,58], and is attributed to an excess of carriers in the ZnO lattice. A small increment observed in mobility, was owing to a high number of free carriers that were generated by tantalum atoms, and the relatively greater crystal size of the shell.…”

Section: Hall Measurementssupporting

confidence: 78%

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Highly Visible Photoluminescence from Ta-Doped Structures of ZnO Films Grown by HFCVD

et al. 2018

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Tantalum-doped ZnO structures (ZnO:Ta) were synthesized, and some of their characteristics were studied. ZnO material was deposited on silicon substrates by using a hot filament chemical vapor deposition (HFCVD) reactor. The raw materials were a pellet made of a mixture of ZnO and Ta2O5 powders, and molecular hydrogen was used as a reactant gas. The percentage of tantalum varied from 0 to 500 mg by varying the percentages of tantalum oxide in the mixture of the pellet source, by holding a fixed amount of 500 mg of ZnO in all experiments. X-ray diffractograms confirmed the presence of zinc oxide in the wurtzite phase, and metallic zinc with a hexagonal structure, and no other phase was detected. Displacements to lower angles of reflection peaks, compared with those from samples without doping, were interpreted as the inclusion of the Ta atoms in the matrix of the ZnO. This fact was confirmed by energy dispersive X-ray spectrometry (EDS), and X-ray diffraction (XRD) measurements. From scanning electron microscopy (SEM) images from undoped samples, mostly micro-sized semi-spherical structures were seen, while doped samples displayed a trend to grow as nanocrystalline rods. The presence of tantalum during the synthesis affected the growth direction. Green photoluminescence was observed by the naked eye when Ta-doped samples were illuminated by ultraviolet radiation and confirmed by photoluminescence (PL) spectra. The PL intensity on the Ta-doped ZnO increased from those undoped samples up to eight times.

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Section: Sem and Eds Studiessupporting

confidence: 93%

“…The effect of both the decreased grain size and the change in the shape of the crystals in the ZnO:Ta-doped films was also observed and reported by different authors [40,41,[56][57][58], and it was in agreement with our experiments. This effect could be owing to the fact that tantalum atoms create a compression stress inside the lattice of ZnO, and they prevents an increase in these big shapes, as generated by the difference of ionic radii between Zn and Ta, as commented before in the XRD results.…”

Section: Sem and Eds Studiessupporting

confidence: 93%

Section: Hall Measurementssupporting

confidence: 78%

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Highly Visible Photoluminescence from Ta-Doped Structures of ZnO Films Grown by HFCVD

et al. 2018

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“…The exact opposite happened with the Cu peaks. Au-ions filling the oxygen vacancies inside the Cu2O lattice led to an improvement on the periodicity of the lattice [21]. The lattice constants were calculated using equation ( 1) [22].…”

Section: Structural Properties Of Au Doped Cu2o Filmsmentioning

confidence: 99%

The Role of Au Doping on the Structural and Optical Properties of Cu<sub>2</sub>O Films

Güneri

2019

JNanoR

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The changes in structural and optical properties of the Cu2O films obtained on the glass with different concentrations of Au by the chemical bath method were studied in this work. Lattice parameter, crystal size, preferential orientation and surface tension of the films were calculated using X-ray diffraction data which showed that all of the films were in polycrystalline form. It was determined that the structural parameters of all films were changed with the doping ratio. The surface morphology of the films was imaged using a field emission scanning electron microscope. The optical properties of the films were discovered using the optic spectrometer. Changes in the optical properties were discovered as a function of Au ratio. It was determined that the energy band gap value (2.12 eV-2.02 eV), the refractive index, the extinction coefficient, the real and dielectric coefficients, the optical conductivity, and the skin depth of films varied with Au doping ratio.

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Morphology-controlled fabrication of nanostructured WO3 thin films by magnetron sputtering with glancing angle deposition for enhanced efficiency photo-electrochemical water splitting

Limwichean

Kasayapanand

Ponchio

et al. 2021

Ceramics International

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Combined influence of fluorine doping and vacuum annealing on the electrical properties of ZnO:Ta films

Cited by 10 publications

References 67 publications

Highly Visible Photoluminescence from Ta-Doped Structures of ZnO Films Grown by HFCVD

Highly Visible Photoluminescence from Ta-Doped Structures of ZnO Films Grown by HFCVD

The Role of Au Doping on the Structural and Optical Properties of Cu<sub>2</sub>O Films

Morphology-controlled fabrication of nanostructured WO3 thin films by magnetron sputtering with glancing angle deposition for enhanced efficiency photo-electrochemical water splitting

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