Optical, structural, morphological, and compositional properties of cobalt doped tin oxide (CTO) thin films deposited by modified chemical bath method in alkaline medium

Ezenwaka, Laz Nnaedozie; Umeokwonna, N.S.; Okoli, N. L.

doi:10.1016/j.ceramint.2019.11.106

Cited by 9 publications

(9 citation statements)

References 30 publications

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“…Then the refractive index value decreases and shows the minimum value of 1.7 at 700 nm. These values are comparable with the previously reported values [20,21]. The average value of refractive index was 1.909.…”

Section: Resultssupporting

confidence: 92%

“…This shows that the reflectance was high at lower wavelength region and it was lower in the higher wavelength region. High transmittance and low absorbance and low reflectance makes the tin oxide thin films good for used as transparent coating materials in the solar cells, used in the display of the electronic gadgets and touch screens [21]. The plot of refractive index versus wavelength of the thin films of tin oxide post annealed at 200 0 C was shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Optical Parameters of Nano metric SnO2 Thin Films Deposited via Sol-Gel Spin Coating Technique

Soumya¹

2021

IRJASH

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Thin films of tin oxides were successfully synthesized by using Tin(II)chloride dihydrate and ethanol as precursors. This paper discuss about the optical parameters of the thin films of tin oxide post annealed at 200 0 C. UV-Vis spectroscopy study reveals that the prepared tin oxide thin film shows high transparency (87.5%) and low absorbance and low reflectance in the region of visible spectrum. The band gap of the tin oxide thin film was obtained as 3.59 eV. The average value of refractive index of the thin films of tin oxide was 1.909. The real and imaginary values of dielectric constants were 7.1 ans 0.33 respectively.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Optical Parameters of Nano metric SnO2 Thin Films Deposited via Sol-Gel Spin Coating Technique

Soumya¹

2021

IRJASH

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“…The improvement in the crystallinity could be of the films as SILAR cycles increased. The crystallite size (D) was calculated using Debye -Scherrer's formula in equation (1) as given by [17, 18} while the dislocation density ( ), lattice strain ( ) and inter-planar spacing (d) were evaluated using equation ( 2), ( 3) and (4) as given by [19,20]. (1)…”

Section: Methodsmentioning

confidence: 99%

Effect of SILAR Cycles on the Thickness, Structural, Optical Properties of Cobalt Selenide Thin Films

N.J

V.C²,

Okoli

et al. 2021

Int. Res. J. multidiscip. Technovation

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Cobalt Selenide thin films were fabricated using Successive Ionic Layer Adsorption and Reaction (SILAR) deposition technique at different SILAR cycles. The precursors for Cobalt and Selenium ions were CoCl2.6H2O and Na2SeSO3 respectively. Optical properties and thickness of the deposited films were studied to determine the effect of number of SILAR cycles on these properties. The optical absorbance of the films was found to decrease as wavelength increases and increases as SILAR cycle increases. Transmittance of the CoSe thin films was found to increase as the wavelength increases but decreases as number of SILAR cycles increased. The extinction coefficient of CoSe thin films decreases as wavelength increases but increases as the SILAR cycles increases. The energy band gap of CoSe thin films deposited decreases from 2.47 eV to 2.20 eV as number of SILAR cycles increases and film thickness increases from 92.96 nm and 225.63 nm. Structural properties of deposited cobalt selenide thin films showed that they correspond to orthorhombic phase of CoSe2 crystal structure of cobalt selenide thin films with crystallite size ranging from 7.63 nm to 13.07 nm.

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“…( 8) is plotted for comparison and is illustrated in the inset of Figure 2. The reported value of microstrain is between 6×10 -3 and 12×10 -3 (20) . The value of strain obtained is small and compressive (negative slope of W-H plot) in nature.…”

Section: Fig 1 Xrd Patterns Of the Sno2 Filmsmentioning

confidence: 99%

“…The values obtained from both techniques show no much difference. The values obtained are depicted in (2,20) . The values obtained in the rapid synthesis are also in par with this.…”

Section: Fig 1 Xrd Patterns Of the Sno2 Filmsmentioning

confidence: 99%

Rapid Synthesis of SnO2 Thin Films using Monoethanolamine through Wet Chemical Route

Murali¹,

Arts²,

Remadevi³

2021

IJST

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Objectives: To develop a unique wet chemical process for the rapid synthesis of SnO 2 thin films and hence to study the structural, morphological, optical and electrical properties of the films. Methods/Analysis: Polycrystalline SnO 2 thin films having a thickness in the range of 800-1000 nm with crystallite size less than 5 nm were synthesized within a time of 20 minutes and without the need of post-annealing using SILAR technique. Lattice parameters, c/a ratio, cell volume, dislocation density, refractive index, extinction coefficient and porosity of the SnO 2 thin films were determined. Findings: Films have a coarse and porous surface morphology with very fine pores distributed nearly uniformly on the film surface. The crystallite size and strain developed in the SnO 2 films were computed by the Williamson-Hall technique. Microstrain developed in the films is of the order of 10 -3 . SnO 2 films exhibit nearly 70% transmittance in the visible region. The optical band gap of the SnO 2 films is 3.65 eV. The refractive index of the films varies from 2.05 to 2.30 in the 450-1900 nm wavelength range. SnO 2 films exhibit a resistivity in the order of 10 -1 Ωcm. Novelty: Reports a unique rapid wet chemical process for the direct preparation of crystalline SnO 2 thin films using monoethaolamine at a temperature of 80 0 C. Literature survey reveals that no other method has yielded such type of good quality SnO 2 thin films at this temperature and without post annealing or sintering. First time crystalline SnO 2 films were prepared by a wet chemical process within 20 minutes.

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Optical, structural, morphological, and compositional properties of cobalt doped tin oxide (CTO) thin films deposited by modified chemical bath method in alkaline medium

Cited by 9 publications

References 30 publications

Optical Parameters of Nano metric SnO2 Thin Films Deposited via Sol-Gel Spin Coating Technique

Optical Parameters of Nano metric SnO2 Thin Films Deposited via Sol-Gel Spin Coating Technique

Effect of SILAR Cycles on the Thickness, Structural, Optical Properties of Cobalt Selenide Thin Films

Rapid Synthesis of SnO2 Thin Films using Monoethanolamine through Wet Chemical Route

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