WET CHEMICAL GROWTH OF ONE DIMENSIONAL ZnO FILM (original) (raw)
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Journal of Saudi Chemical Society, 2014
Flat crystal ZnO thin films were prepared by chemical bath deposition technique onto glass substrates. XRD patterns of the films deposited at about 80°C and annealed at 200°C for 1 h in oxygen environment revealed the existence of polycrystalline hexagonal wurtzite phase with c-axis orientation of crystallites in the films. The crystallite size and lattice strain from X-ray line broadening profile were evaluated using the Scherrer method and Williamson-Hall method. Structural parameters such as dislocation density, stacking faults probability, lattice constants, lattice stress, unit cell volume, internal parameter, texture and number of crystallites per unit area have also been calculated. Surface morphology of the films was analyzed by scanning electron microscopy and atomic force microscopy. Photoluminescence spectrum at room temperature exhibited two luminescence centers, one is for UV emission (near band edge emission) located at 3.18 eV and another is for deep level emission located at 2.56 eV.
2020
This study carried out on the effect of precursor concentration and annealed substrate temperature on the crystal structure, electronic and optical properties of ZnO thin film. An aqueous solution of Acid Nitrite was used as precursors and its concentration was varied from 0.1 M to 0.4 M. The ZnO thin film was deposited on the glass substrate by Spray Pyrolysis Deposition and annealed with different temperature from 300 o C to 600 o C. The crystal structure, electronic and optical properties were investigated by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) and UV-Spectrometer. XRD result showed that all thin films have amorphous hexagonal wurtzite crystalline. Particle sizes ranging from 21.83 to 43.67 nm were calculated through Debye-Scherer Method. It showed that the concentration of the precursor had slightly impact on the particle size. Meanwhile, the increase in particle size with increasing annealed temperature is found to be gradual. The average transparent of ...
I used aqueos solution technique in my own research process and not Spray pyrolysis. IT was published with the title ' THE EFFECT OF DEPOSITION TIME ON THE STRUCTURAL AND OPTICAL PROPERTIES OF ZnO THIN FILMS BY AQUEOUS CHEMICAL GROWTH TECHNIQUE'., 2011
We achieved the deposition of highly crystalline zinc oxide thin films by aqueous chemical growth process at 95 o C. The precursor solution used in the deposition include Zn(NO 3) 2 .6H 2 O and C 6 H 12 N 4. Two different samples were grown on glass substrates at 5 hours and 12 hours deposition time. These were characterized by means of x-ray diffraction, scanning electron microscope, and spectrophotometer at normal incidence of light. X-ray diffraction results show that highly crystalline ZnO thin film can be achieved at a longer deposition time. Besides, the increase in the deposition time leads to a red shift in the band gap energy of the films.
Journal of Modern Physics, 2012
Thin films of Zinc Oxide (ZnO) having different concentrations were deposited using the Aqueous Chemical Growth (ACG) method. The films were characterized using Rutherford Back Scattering (RBS) spectroscopy for chemical composition and thickness, X-Ray Diffraction (XRD) for crystallographic structure, a UV-VIS spectrophotometer for the analysis of the optical and solid state properties which include spectral absorbance, transmittance, reflectance, refractive index, direct band gap, real and imaginary dielectric constants, absorption and extinction coefficients and a photomicroscope for photomicrographs. The average deposited film thickness was 100 nm. The results indicate that the values of all the optical and solid state properties investigated vary directly with concentration except transmittance which is the reverse. Thus, the optical and solid state properties of ZnO thin film deposited by the Aqueous Chemical Growth method can be tuned by deliberately controlling the concentration of the precursors for various optoelectronic applications including its application as absorber layer in solar cells.
Growth Time Effect on the Structural and Sub-Structural Properties of Chemically-Deposited ZnO Films
Advanced Materials Research, 2015
Nanostructured ZnO films are obtained by chemical bath deposition from zinc nitrate, hexamethylenetetramine and ammonia. The evolution of the structural and sub-structural properties of the films is characterized using high resolution scanning electron microscopy (SEM) and X-ray diffraction analysis. In particular, we detail here the influence of condensation time on the crystal phase, texture quality, lattice constants, grain size, coherent scattering domain size (CSD), microstrain, stress and concentration of dislocations. Obtained condensates have the wurtzite structure with lattice parameters in the range a = 0.3248-0.3254 nm and c = 0.5206-0.5214 nm, depending on the condensation time. The grain size and microstrain in the direction perpendicular to the crystallographic planes (002) are in the range L ~ 26-42 nm and ε ~ (0.59-3.09)·10-3, respectively. Furthermore, the effects of deposition time on microstrain, stress and concentration of dislocations in the layers is establishe...
Materials Research Express, 2019
Research and development of nano-sized Zinc Oxide (ZnO) has recently received great attention due to its remarkable properties such as large exciton binding energy of 60 meV, extraordinary photosensitivity, nontoxic nature, wide bandgap and the fact that it is a low cost material with many technological applications. The inherent necessity for stoichiometric ZnO nanostructures suggest that a deposition method where the film stoichiometry is controlled by a chemical reaction is unavoidable. Moreover, it is extremely important, when developing new methods for deposition of ZnO nanostructures to keep the deposition system as simple as possible, maximize throughput, and keep costs at a minimum. Modified aqueous chemical growth method offer such an opportunity. In this work, ZnO nano-petals on microscope glass substrates have been prepared by using a modified aqueous chemical growth method. On the other hand, before utilization of the fabricated ZnO nanostructures by any technique for any technological applications, it is essential to investigate morphological, optical, electrical and structural properties. In this work morphological, optical, electrical and structural properties with respect to change in deposition time have been cross examined using FESEM, UV-Vis spectroscopy, I-V properties by Keithley system and XRD respectively. SEM micrographs have revealed very little changes in the shape, orientations and distribution of ZnO nanopetals formed with change in deposition times. SEM micrographs have also revealed the growth pattern for the prepared ZnO nano-petals which proceeds via a nucleation, and coalescence of ZnO nuclei. XRD analysis have revealed that the synthesized ZnO nano-petals have a hexagonal Wurtzite ZnO structure with peaks at 2θ positions 31.7°, 34.4°, 36.2°, 47.4°, 56.5°and 62.7° belonging to the (100), (002), (101), (102), (110) and (103) planes respectively. UV-Vis spectroscopy has in the same way shown that the synthesized ZnO nano-petals have energy band gaps ranging from 3.46 eV to 3.65 eV. I-V measurements have disclosed that the ZnO nano-petals are conductive. Film resistivity values obtained from the I-V curves showed an exponential increase in resistivity with increased film thickness. Our method of preparation of ZnO nano-petals via a chemical assisted route can serve as benchmark for controlled synthesis of ZnO nanostructures for various technological applications.
ZnO films grown by successive chemical solution deposition
Applied Physics A-materials Science & Processing, 2007
ZnO films were grown from 0.1-M zincate solutions on stainless-steel and aluminosilicate glass substrates by the successive chemical solution deposition method. The structure, morphology, composition, and optical emission properties of the films were studied by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and photoluminescence techniques. Results revealed that the as-grown film contains a substantial amount of amorphous zinc hydroxide (15–25%), at least on its surface. This can be reduced to 7% by annealing the film in argon (350 °C, 1 h). Despite the presence of the hydroxide phase, the films hexagonal lattice constants match the standard values. The films surface texture and the grains shape and preferential orientation depend on the type of the substrate and its surface conditioning. The UV photoluminescence emission from as-grown films at 3.22±0.04 eV (380–390 nm) and its suppression due to the effect of chlorine are addressed.