Effect of Al doping on crystallography and electro-optical properties of ZnO semiconductor thin films prepared by electrospinning

Osali, Soheila; Esfahani, Hamid; Karami, Hamidreza

doi:10.1016/j.solidstatesciences.2018.05.016

Cited by 27 publications

(6 citation statements)

References 57 publications

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“…In recent years, the attention of scientists in the field of nanotechnology has been attracted by one-dimensional (1D) semiconductor nanomaterials based on metal oxides, which due to the large specific surface area, unique optical and electrical properties, can be applied in chemical sensors, batteries, fuel and solar cells, optic and optoelectronic devices or photocatalysis [1][2][3][4][5][6][7][8] . This group of materials includes SnO 2 , Bi 2 O 3 , TiO 2 , ZnO [9][10][11][12] .…”

mentioning

confidence: 99%

Synthesis of hybrid amorphous/crystalline SnO2 1D nanostructures: investigation of morphology, structure and optical properties

Matysiak

Tański

Smok

et al. 2020

Sci Rep

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The aim of the study was to prepare SnO2 nanowires via a combination of electrospinning and the sol–gel method from a polyvinylpyrrolidone (PVP)/dimetylformamide (DMF)/ethanol(EtOH)/tin(IV) chloride pentahydrate (SnCl4·5H2O) solution. The morphology, structure and chemical composition of the obtained PVP/SnO2 nanofibers and SnO2 nanowires were examined using transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) as well as a scanning electron microscope (SEM) with an energy dispersive spectrometer (EDX). The optical property analysis was performed on the basis of UV–Vis spectra of absorbance as a function of the wavelength, based on which the rated values of band gaps of the fabricated 1D nanostructures were determined. The morphology analysis showed that the obtained amorphous SnO2 nanowires with crystalline protuberances were characterized by a diameter of 50 to 120 nm. Results demonstrated that nanowires with a ratio of 1:1 precursor to polymer in the spinning solution were characterized by the smallest diameter after calcination and the smallest energy gap of 3.3 eV among all investigated samples. The rest of the studied materials were characterized by a larger energy gap (3.8 and 3.9 eV).

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mentioning

confidence: 99%

Synthesis of hybrid amorphous/crystalline SnO2 1D nanostructures: investigation of morphology, structure and optical properties

Matysiak

Tański

Smok

et al. 2020

Sci Rep

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“…The obtained values are listed in 2-ions. This leads to a compression of the structure along the c axis [25,26].…”

Section: Resultsmentioning

confidence: 99%

“…Mg 2+ ionic radius (0.72 Å) is comparable to the Zn 2+ ionic radius (0.74 Å), thus the decrease may be due to the electronegativity difference between Zn and Mg, inducing an effect of the interaction of Mg 2+ ions with O 2ions. This leads to a compression of the structure along the c axis [25,26].…”

Section: Xrdmentioning

confidence: 99%

The structural and optical properties of Al and Mg doped ZnO synthesized by solid state reaction method

Bilgili

2021

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In this study, the structural and optical properties of Al and Mg doped zinc oxide Zn0.98M0.02O (M= Al, Mg) prepared by solid state reaction method is investigated. Xray diffraction (XRD), Scanning Electron Microscopy (SEM), UV-Visible spectroscopy (UV-Vis) and Fourier Transform Infrared (FTIR) spectroscopy were employed to study the structural and optical properties. With XRD analysis, it was revealed that all the samples are hexagonal wurtzite structure and exhibit no impurity phases. The reflectance spectra was used to determine the optical band gap of the samples. And it was found that undoped ZnO sample has an energy band gap of 3.16 eV which increases with Al and Mg doping, probably driven by the decrease in the lattice parameters. The structural bond vibrations of undoped and doped ZnO were analysed by FTIR spectroscopy, and it was seen that the broad absorption band is at approximately 550 cm -1 for all the samples, which corresponds to the stretching vibration of Zn-O bond.

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“…We had tried various materials for this brush-coating process, and lanthanum aluminum zirconium zinc oxide (LaAlZrZnO) was used for the alignment layer because of the good solubility to the solvent (2-methoxyethanol, in this case) and excellent EO properties of the constituent elements. [24][25][26][27] The morphological properties of the brush-coated film were observed by atomic force microscopy (AFM) and line profiles. Xray photoelectron spectroscopy (XPS) and contact angle analysis were used to examine the surface chemical bonding states and chemical affinities.…”

Section: Introductionmentioning

confidence: 99%

“…The brush‐coating method based on the solution process affects the morphology and directionality of the alignment layer surface owing to shear stresses generated during the coating process; this is expected to have various effects on the LC alignment state. We had tried various materials for this brush‐coating process, and lanthanum aluminum zirconium zinc oxide (LaAlZrZnO) was used for the alignment layer because of the good solubility to the solvent (2‐methoxyethanol, in this case) and excellent EO properties of the constituent elements [24–27] . The morphological properties of the brush‐coated film were observed by atomic force microscopy (AFM) and line profiles.…”

Section: Introductionmentioning

confidence: 99%

Tunable Liquid Crystal Alignment and Driving Mode on Lanthanum Aluminum Zirconium Zinc‐Oxide Thin Film Achieved by Convenient Brush‐Coating Method

Lee

Kim

et al. 2022

ChemNanoMat

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Tunable liquid crystal (LC) alignment with twisted nematic (TN) and vertical alignment (VA) driving modes is achieved by a convenient brush-coating method. The brushcoating process combines film deposition and alignment treatment processes, and lanthanum aluminum zirconium zinc oxide (LaAlZrZnO) is used for the LC alignment layer. Xray photoelectron spectroscopy results confirm LaAlZrZnO film formation with fine optical transparency. Atomic force microscopy and line profile data indicate nano/micro surface structure with dense or directional morphologies induced by shear stresses according to film curing temperature. Lowtemperature-cured films exhibit hydrophobic properties with low surface energy, whereas high-temperature-cured films show hydrophilicity with high surface energy. The geometric constraints and chemical affinities of the films induce homeotropic and homogeneous LC alignments on the surface according to the film curing temperature, respectively. The LC alignment state is verified by polarized optical microscopy and pretilt angle analysis. The brush-coated LaAlZrZnO film demonstrates high thermal budget for advanced LC systems. The VA-mode and TN-mode LC cells based on the LaAlZrZnO film enable high electro-optical performances and low power consumption. Therefore, the brush-coating method is expected to be adoptable for nextgeneration LC device applications.

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Effect of Al doping on crystallography and electro-optical properties of ZnO semiconductor thin films prepared by electrospinning

Cited by 27 publications

References 57 publications

Synthesis of hybrid amorphous/crystalline SnO2 1D nanostructures: investigation of morphology, structure and optical properties

Synthesis of hybrid amorphous/crystalline SnO2 1D nanostructures: investigation of morphology, structure and optical properties

The structural and optical properties of Al and Mg doped ZnO synthesized by solid state reaction method

Tunable Liquid Crystal Alignment and Driving Mode on Lanthanum Aluminum Zirconium Zinc‐Oxide Thin Film Achieved by Convenient Brush‐Coating Method

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