Effect of precursor medium on structural, electrical and optical properties of sprayed polycrystalline ZnO thin films

Vimalkumar, T.V.; Poornima, N.; Kartha, C. Sudha; Vijayakumar, K. P.

doi:10.1016/j.mseb.2010.06.012

Cited by 35 publications

(6 citation statements)

References 36 publications

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“…It is suggested from Fig. 4(A) that nitrate anions facilitate the fast growth rate of the CuO nanostructure in a preferential orientation as a nanorod shape, which is in good agreement with the results of ZnO hydrothermal growth [31]. Fig.…”

Section: Resultssupporting

confidence: 86%

“…The higher slope magnitude of CuO-Ac in comparison to that of CuO-Su and CuO-Ni suggests the enhancement of the lattice tensile strain where mean lattice microstrains (η) were calculated to be 0.0037, 0.0025, and 0.013% for CuO-Ni, CuO-Su, and CuO-Ac samples, respectively. The induced lattice strain is commonly originated from defects and lattice distortions in the crystals [31]. Moreover, the average crystallite sizes of the CuO were determined using the intersect value of the regression lines with the y axis.…”

Section: Resultsmentioning

confidence: 99%

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Investigating on photocatalytic performance of CuO micro and nanostructures prepared by different precursors

Safa

Azimirad

Moghaddam

et al. 2016

Desalination and Water Treatment

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In this paper, various morphologies of copper oxide (CuO) were synthesized from acetate, sulfate, and nitrate precursors using hydrothermal bath method. The photoluminescence spectra revealed that CuO-Ni sample contains the strongest surface defect peak which can be related to its highest active surface area. The Fourier transform infrared (FT-IR) results showed that the concentration of the surface OH − group on the samples varies considerably according to CuO-Ac > CuO-Ni > CuO-Su. From structural results, it could be observed that all the samples crystallized into a monoclinic crystal structure. The photocatalytic activity of CuO samples was evaluated by the catalytic oxidation of methylene blue in the presence of hydrogen peroxide. Concerning the nearly same optical band gap for the samples, the best photocatalytic performance of CuO-Ni nanorods was assigned to its highest active surface area and surface hydroxyl groups.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Investigating on photocatalytic performance of CuO micro and nanostructures prepared by different precursors

Safa

Azimirad

Moghaddam

et al. 2016

Desalination and Water Treatment

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“…Here also we observe that the variation of DLE / NBE for all samples matches closely with the variation of resistivity. Supporting evidence from structural, optical, and electrical studies, and so forth has been reported elsewhere [53].…”

Section: Effect Of Variation Of Deposition Parameterssupporting

confidence: 64%

Reliable and Damage-Free Estimation of Resistivity of ZnO Thin Films for Photovoltaic Applications Using Photoluminescence Technique

Poornima

Vimalkumar

Rajeshmon

et al. 2013

International Journal of Photoenergy

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This work projects photoluminescence (PL) as an alternative technique to estimate the order of resistivity of zinc oxide (ZnO) thin films. ZnO thin films, deposited using chemical spray pyrolysis (CSP) by varying the deposition parameters like solvent, spray rate, pH of precursor, and so forth, have been used for this study. Variation in the deposition conditions has tremendous impact on the luminescence properties as well as resistivity. Two emissions could be recorded for all samples-the near band edge emission (NBE) at 380 nm and the deep level emission (DLE) at ∼500 nm which are competing in nature. It is observed that the ratio of intensities of DLE to NBE (DLE / NBE) can be reduced by controlling oxygen incorporation in the sample.-measurements indicate that restricting oxygen incorporation reduces resistivity considerably. Variation of DLE / NBE and resistivity for samples prepared under different deposition conditions is similar in nature. DLE / NBE was always less than resistivity by an order for all samples. Thus from PL measurements alone, the order of resistivity of the samples can be estimated.

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“…No additional diffraction peaks related to Al 2 O 3 or other impurities are observed, which show that Al 3+ ions were substituted into Zn 2+ ion sites or incorporated into the interstitial sites in the ZnO lattice [21,22]. The presence of various diffraction peaks match well with the hexagonal wurtzite-type crystal structure of ZnO, having space group P6 3 mc (JCPD 36-1451), and suggest that the coated films are polycrystalline in nature [23]. All the films present (002) peak in the XRD patterns indicating that the Al-doped zinc oxide films have a preferred orientation c-axis.…”

Section: Resultsmentioning

confidence: 69%

X-ray Diffraction, XPS, and Raman Spectroscopy of Coated ZnO:Al (1—7 at%) Nanoparticles

Konan

Hartiti

Batan

et al. 2019

e-J. Surf. Sci. Nanotechnol.

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Group III elements doping for zinc oxide is currently attracting much attention for the study of absorber layer in nano-optoelectronic and photovoltaic devices as an alternative route to indium tin oxide (ITO) due to their optimized properties. In this report, Al-doped ZnO (AZO, Al: 1−7 at%) nanoparticles have been successfully deposited onto glass substrates using sol-gel process, and investigated by techniques such as X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The coated ZnO:Al nanoparticles at Al concentration up to 5 at% showed a nanosized polycrystalline structure with a c-plane preferred orientation. In AZO (7 at%), lower diffraction peaks were observed. The crystallite size calculated from XRD was ranged 38.7−43.5 nm. SEM showed spherical nanoparticles in shape with a smooth surface. The Raman results provided peaks located at 434, 435, 559, 851, and 1090 cm −1. According to XPS, the as-grown nanoparticles present the most intense peak located at about 1021.8 eV, assigned to the Zn 2p 3/2 corresponding to zinc oxide. It was concluded that the structural properties of AZO thin films were improved with Al (5 at%), and these samples may be considered as an alternative of costly ITO in thin-film photovoltaic applications.

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Effect of precursor medium on structural, electrical and optical properties of sprayed polycrystalline ZnO thin films

Cited by 35 publications

References 36 publications

Investigating on photocatalytic performance of CuO micro and nanostructures prepared by different precursors

Investigating on photocatalytic performance of CuO micro and nanostructures prepared by different precursors

Reliable and Damage-Free Estimation of Resistivity of ZnO Thin Films for Photovoltaic Applications Using Photoluminescence Technique

X-ray Diffraction, XPS, and Raman Spectroscopy of Coated ZnO:Al (1—7 at%) Nanoparticles

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