Nanostructured ZnO films with various morphologies prepared by ultrasonic spray pyrolysis and its growing process

Ma, Hongyan; Liu, Zhongwu; Zeng, Deliang; Zhong, Minlin; Yu, Hao; Mikmeková, Eliška

doi:10.1016/j.apsusc.2013.07.060

Cited by 29 publications

(9 citation statements)

References 10 publications

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“…The position of the peaks shifts towards lower angles when increasing the substrate temperature from 473 K to 523 K and then towards larger angles when increasing the substrate temperature up to 623 K. The peaks shift again towards lower angles when increasing the deposition temperature from 623 K to 673 K. This complex pattern can be explained by a combination of the compositional evolution of the material and presence of residual stresses in the films as previously observed in . These residual stresses could be caused by both the lattice mismatch and thermal expansion coefficient difference between film and substrate .…”

Section: Resultssupporting

confidence: 61%

Influence of substrate temperature on the structural and optical properties of crystalline ZnO films obtained by pulsed spray pyrolysis

Dobrozhan

Kurbatov

Opanasyuk

et al. 2015

Surface & Interface Analysis

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In this work, we report on the structural and optical properties of ZnO films deposited by pulsed spray pyrolysis at relatively low temperatures, compatible with a large variety of substrates and processing technologies. Crystalline ZnO films were deposited onto glass substrates using zinc acetate dihydrate dissolved in distilled water with concentration of 0.2 M. The temperature of the substrate was varied in the range T s = 473-673 K with ΔТ = 50 K. Effect of T s were investigated by scanning electron microscopy, x-ray diffraction and energy dispersive x-ray, and optical spectroscopies. Also, the influence of T s on the grain size, phase composition, texture quality, coherent scattering domain size, crystal lattice parameters, chemical composition, transmission coefficient, and the bang gap of the ZnO films were studied. X-ray diffraction analysis revealed that films were polycrystalline with hexagonal phase and showed as preferential orientation (101) at T s < 573 K and (100) and (002) at T s > 573 K. Scanning electron microscopy (SEM) measurements showed that the substrate temperature has a strong effect on morphology of the films. Energy dispersive analysis revealed that ZnO films consisted of the non-stoichiometric compounds. Optical measurements showed ZnO films to be highly transparent in the visible region, and optical band gap is shifting from 3.18 eV to 3.30 eV.

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Section: Resultssupporting

confidence: 61%

Influence of substrate temperature on the structural and optical properties of crystalline ZnO films obtained by pulsed spray pyrolysis

Dobrozhan

Kurbatov

Opanasyuk

et al. 2015

Surface & Interface Analysis

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show abstract

“…ZnO thin films, which are used for this purpose, should be in a single phase and have high transmittance and electrical conductivity, low microstresses and microstrains grades, and a small dislocation density. Increased transmission in ZnO layers could be achieved by deposition of nanocrystalline films which would have a larger band gap due to the quantum confinement effect .…”

Section: Introductionmentioning

confidence: 99%

Substructural investigations, Raman, and FTIR spectroscopies of nanocrystalline ZnO films deposited by pulsed spray pyrolysis

Dobrozhan

Opanasyuk

Kolesnyk

et al. 2015

Physica Status Solidi (a)

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Nanocrystalline ZnO films were deposited onto glass substrates in the temperature range of 473-673 K using pulsed spray pyrolysis. The structural, substructural, and optical properties of the films were investigated by means of X-ray diffraction analysis, Raman scattering, and Fourier transform infrared (FTIR) spectroscopy. The effect of the substrate temperature (T s ) on the coherent scattering domain (CSD) sizes L, microstrains e, and microstress s grades, and the average density of dislocations r in the films were estimated through the broadening of X-ray lines using the Cauchy and Gauss approximations and the threefold function convolution method. The ZnO films grown at T s ¼ 623-673 K possessed the highest values of L, and the lowest of e, s, and r, indicating high-crystalline quality. The Raman spectra showed peaks located at 95-98, 333-336, 415, 439-442, 572, and 578-584 cm À1 , which were interpreted as E 2 low (Zn), (E 2 high ÀE 2 low ), E 1 (TO), E 2 high (O), A 1 (LO) and E 1 (LO) phonon modes of the ZnO wurtzite phase. The FTIR spectra showed relatively weak signals at 856, 1405, and 1560 cm À1 , corresponding to the C-H and C-O stretching modes, in addition to the main Zn-O mode at 475 cm À1 , indicating a low content of precursor residues.

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“…The resistivity values of ZnO films may be adjusted between 10 -3 Ω cm and 10 -5 Ω cm by changing the annealing conditions and doping [10]. Currently, many methods are being used to prepare ZnO films, such as molecular beam epitaxy (MBE), chemical vapor deposition, electrochemical deposition, pulsed laser deposition (PLD), sol-gel process, reactive evaporation, magnetron sputtering technique and spray pyrolysis [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Urbach Energy with Solution Molarity on the Electrical Conductivity in Undoped ZnO Thin Films

Benramache¹,

Benhaoua²

2016

J. Nano- Electron. Phys.

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This paper presents the results concerning the new correlation between electrical conductivity and Urbach energy was investigated as a function of solution molaritie in ZnO thin films. The model proposals were based on experimental data as discussed in our published paper. ZnO thin films were prepared into the ultrasonic spray method with different solution molarities on glass substrate at 350 °C. The measurement data's showing that the electrical conductivity of undoped ZnO thin films can be estimated by varying the Urbach energy and the concentration of ZnO solution, which were found that the correlate values of electrical conductivities are in qualitative agreements with experimental data's. Because, it was in high correlation coefficient can be varied in the range between 0.97-0.99 %. The high agreement was found in the calculation and achieved in Eq. (4) with maximum relative errors values were limited to zero %, due to the sign plus was found between parameters correlates.

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Nanostructured ZnO films with various morphologies prepared by ultrasonic spray pyrolysis and its growing process

Cited by 29 publications

References 10 publications

Influence of substrate temperature on the structural and optical properties of crystalline ZnO films obtained by pulsed spray pyrolysis

Influence of substrate temperature on the structural and optical properties of crystalline ZnO films obtained by pulsed spray pyrolysis

Substructural investigations, Raman, and FTIR spectroscopies of nanocrystalline ZnO films deposited by pulsed spray pyrolysis

Influence of Urbach Energy with Solution Molarity on the Electrical Conductivity in Undoped ZnO Thin Films

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