Fluorine highly doped nanocrystalline SnO2 thin films prepared by SPD technique

Alkhayatt, Adel H. Omran; Hussian, Shymaa K.

doi:10.1016/j.matlet.2015.04.130

Cited by 33 publications

(9 citation statements)

References 17 publications

(11 reference statements)

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“…To investigate the feasibility of F – doping in MOs by thin-film processing via combustion synthesis, several chemical fluoride precursors and fabrication conditions for film deposition were first screened. In–O was chosen as a model system for F – doping, since it is a simple binary oxide widely used for TFT fabrication. ,,− Indium nitrate (In(NO 3 ) 3 ) was chosen as the metal source and oxidizer, while acetylacetone (AcAcH) is the standard fuel. ,,,− After several trials (Table S1), NH 4 F was chosen as the fluoride source, since it is inexpensive and widely used for F – doping in transparent conducting oxides (e.g., F – -doped tin oxide) by sol–gel processes. − A small amount of concentrated (conc) HNO 3 (0.35% (v/v)) is added to the combustion precursor solution before film deposition to prevent the formation of insoluble nanoparticles (Figure S1). In preliminary experiments using NH 4 F-containing combustion formulations, it was found that annealing the F – -containing thin-film precursors at high annealing temperatures for extended times typical of MO combustion synthesis (250–300 °C for 20–60 min, Figure a) ,,,,,− does not facilitate F – incorporation into the MO films likely due to volatile HF elimination during annealing and weak In–F bonding (vide infra) .…”

Section: Resultsmentioning

confidence: 99%

“…Thus, for any crystal domains, F – will act as a donor in conducting (e.g., FTO − ) or semiconducting (e.g., F:ZnO) metal oxides. Because the F states do not contribute near the band edges (Figure a), due to the greater In–F bond strength (516 kJ/mol) versus the In–O (346 kJ/mol), the presence of F – cannot contribute to the free electron scatteringas an O vacancy in the crystalline oxide does.…”

Section: Resultsmentioning

confidence: 99%

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Structure–Charge Transport Relationships in Fluoride-Doped Amorphous Semiconducting Indium Oxide: Combined Experimental and Theoretical Analysis

et al. 2019

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Anion doping of transparent amorphous metal oxide (a-MO) semiconductors is virtually unexplored but offers the possibility of creating unique optoelectronic materials owing to the chemical tuning, modified crystal structures, and unusual chargetransport properties that added anions may impart. We report here the effects of fluoride (F − ) doping by combustion synthesis, in an archetypical metal oxide semiconductor, indium oxide (In−O). Optimized fluoride-doped In−O (F:In−O) thin films are characterized in depth by grazing incidence X-ray diffraction, X-ray reflectivity, atomic force microscopy, X-ray photoelectron spectroscopy, and extended X-ray absorption fine structure (EXAFS). Charge-transport properties are investigated in thin-film transistors (TFTs), revealing that increasing fluoride content (0.0 → 1.57 atom %) slightly lowers the on-current (I on ) and electron mobility due to scattering from loosely bound F − centers but enhances important TFT performance parameters such as the I on /I off ratio, subthreshold swing, and bias stress stability, yielding superior TFT switching versus undoped In−O. These results are convincingly explained by ab initio molecular dynamics simulations and density functional theory electronic structure calculations. Combined with the EXAFS data, the experimental and theoretical results show that F − hinders crystallization by enhancing the local and medium-range disorder, promotes a uniform film morphology, and favors the formation of deeper, more localized trap states as compared to F − -free In−O. These data also show that the local organization and electronic structure of amorphous F − -doped oxide semiconductors are significantly different from those of F − -doped crystalline oxide semiconductors and suggest new avenues to further modify a-MOs for enhanced optoelectronic properties.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Structure–Charge Transport Relationships in Fluoride-Doped Amorphous Semiconducting Indium Oxide: Combined Experimental and Theoretical Analysis

et al. 2019

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“…One can observe from the reflectance spectra that the increasing in the nanoparticles density leads to decrease the intensity of reflection, it is suggested that the presence of titania nanoparticles in starch-based polymer improved the UV-shielding property of the polymer. The absorption coefficient (α) was calculated by using the equation [15]…”

Section: Resultsmentioning

confidence: 99%

"The Effects of Additive TiO2 Nanoparticles on the Optical properties of DCM Doped with PVC Thin Films "

Hussian¹,

Al-musaw²,

himidi³

2018

MJPS

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"In this work thin films containing laser dye (DCM) doped with (PVC) were prepared using casting method. Titania (TiO2) nanoparticles also were synthesized using sol-gel technique. Different titania nanoparticle densities (0.882×1020, 1.765×1020, 2.648×1020 and 3.530×1020 cm-3) were co-doping with dye doped polymer to study the effect of this addition on the optical properties and electronic transition energy gaps in cases of both direct and indirect transitions, Absorbance spectra were measured using Spectrophotometer. Absorption and extinction coefficients as well as the refractive indices have been obtained the spectra of absorbance at the strong absorption region. It was observed from results that the allowed direct electronic transitions energy gap was decreasing from 2.22 to 2.175e.V with the increasing of titania nanoparticles density and the allowed indirect electronic transition energy gap decreasing from 2.19 to 2.13e.V.

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“…The calculated lattice constant a are tabulated in table 1 which are in a good agreement with the reported value in (JCPDS Card). The crystallite size for the preferential orientations of the prepared samples was calculated using Debye-Sherrer formula [24,25].…”

Section: Experiments Detailsmentioning

confidence: 99%

Structure, surface topography and optical characterization of Ag co – doped Cd1-xCuxO nanostructure thin films

Alkhayatt¹

2017

JK-Physics

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Cd1-xCuxO and Ag co-doped Cd1-xCuxO nanostructure thin films with x = 0.2 and different Ag content (0-8%) were deposited by chemical spray pyrolysis technique on glass substrates at a temperature of 350 oC. The XRD results showed that the prepared films have polycrystalline with low crystallinity nature for CdO cubic structure. The preferential orientation of all films was absorbed along (111) plane. CuO monoclinic phase has appeared with low intensity while the Ag cubic phase appeared only in 8% of Ag content. Structural parameters such as average crystallite size, dislocation density and micro-strain were also investigated. SEM images revealed that the surface morphology of the films consists of spherical shaped grains uniformly distributed without detectable micro-cracks and improved by Ag Co-doping. EDXS spectrum analysis confirmed purity and stoichiometry of the prepared compositions. AFM results showed that the surface topography and the surface quality of the deposited thin films can be controlled by the variation of the Ag co-doping concentration. Optical absorbance and transmittance of Ag co-doped Cd1-xCuxO thin films has high values in the visible and near infrared regions respectively and varied with Ag co-doping content. Direct optical energy band gap of Cd1-xCuxO exhibits a blue shift with Ag co-doping, due to the quantum size and Burstein–Moss (BM) effects. The increasing of optical energy gap was confirmed by the decrease in the Urbach tails energy EU after Ag co-doping..

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Fluorine highly doped nanocrystalline SnO2 thin films prepared by SPD technique

Cited by 33 publications

References 17 publications

Structure–Charge Transport Relationships in Fluoride-Doped Amorphous Semiconducting Indium Oxide: Combined Experimental and Theoretical Analysis

Structure–Charge Transport Relationships in Fluoride-Doped Amorphous Semiconducting Indium Oxide: Combined Experimental and Theoretical Analysis

"The Effects of Additive TiO2 Nanoparticles on the Optical properties of DCM Doped with PVC Thin Films "

Structure, surface topography and optical characterization of Ag co – doped Cd1-xCuxO nanostructure thin films

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