Effect of Film Thickness on Structural, Electrical, and Optical Properties of Sol-Gel Deposited Layer-by-layer ZnO Nanoparticles

Shariffudin, Shafinaz Sobihana; Muhamad, Salina; Herman, Sukreen Hana; Rusop, M.

doi:10.4313/teem.2012.13.2.102

Cited by 61 publications

(37 citation statements)

References 17 publications

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“…Figure 5 depicts the energy band gap value for ZnO thin film which varies from 3.23 eV -3.40 eV which is very close to work done by Ilican et al [7]. The slight deviation in the energy band gap from this work compared with the previous work [7] [10] [11] may be due to the fact that the values of band gap depend on many factors likecoating speed (rpm), the granular structure, the nature and concentration of precursors, the structural defects and the crystal structure of the films. The band gap difference between the film and bulk ZnO is due to the grain boundary, the stress and the interaction potentials between defects and the host materials in the films [12].…”

supporting

confidence: 63%

Effect of Spin Coating Speed on Some Optical Properties of ZnO Thin Films

Ajadi¹,

Agboola²,

Adedokun³

2016

MSCE

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This paper reports the synthesis and characterization of ZnO thin films prepared by sol-gel spin coating technique. The sol-gel was prepared from zinc acetate dehydrate as a precursor, 2-methoxyethanol as a solvent and di-ethanolamine as a stabilizer, and then deposited on glass substrate using spin coater at the coating speed of 1000 rpm, 2000 rpm, 3000 rpm, 4000 rpm, 5000 rpm and 6000 rpm. After pre-heated at 150˚C, the samples were post-heated at 250 o C and also annealed at 400˚C. X-ray diffraction (XRD) of the films showed polycrystalline hexagonal structure, with (002) orientation as most intense peak having a grain size of 28.1 nm. The absorbance of the film decreases with increasing wavelength and the transmittance was generally high between visible regions from 280 nm -1200 nm. The ZnO films deposited at a spinning speed of 2000 rpm had highest transmittance of 88% in the visible region from 280 nm -1200 nm. The energy band gap was found to be in the range of 3.23 -3.40 eV. The thicknesses of the films decreased with increase in coating speed. Based on these results, ZnO thin films obtained could have useful application in transparent conducting oxide electrode in solar cells.

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confidence: 63%

Effect of Spin Coating Speed on Some Optical Properties of ZnO Thin Films

Ajadi¹,

Agboola²,

Adedokun³

2016

MSCE

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“…In the undoped ZnO, the trapped carriers in the grain boundaries could be responsable for the increase of the resistivity [34]. In the Ho-doped ZnO series, the insertion of the holmium ions in the ZnO matrix is expected to be rather difficult due to the higher ionic radius of the Ho 3+ ions (0.904 Å) as compared with the Zn ionic radius (0.704 Å).…”

Section: Resultsmentioning

confidence: 99%

Magnetic and Electrical Properties of Undoped and Holmium Doped ZnO Thin Films Grown by Sol-Gel Method

Popa

Schmerber

Toloman

et al. 2013

AEF

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Abstract. Undoped and holmium-doped ZnO thin films were obtained, using the sol-gel method. The films were characterized by scanning electron microscopy (SEM), Hall effect measurements, electron paramagnetic resonance (EPR) spectroscopy and superconducting quantum interference device -vibrating sample magnetometry (SQUID-VSM). The Hall effect measurements have indicated a n-type conduction with a resistivity of about 3.2 Ω.cm for the undoped ZnO and of about 4.5 Ω.cm for the 5 at. % Ho-doped ZnO thin films. The EPR measurements have indicated the presence of interstitial zinc in the undoped ZnO and the presence of zinc vacancies in 5 at. % Ho-doped ZnO. Ho (5 at. %)-doped ZnO films exhibit superparamagnetism at 5 K, while a low paramagnetic behavior was observed at room temperature.

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“…The desired gas concentration was generated by mixing proper flows of synthetic dry air and ethanol (SIAD, Italy, www. siad.com) [24].…”

Section: Methodsmentioning

confidence: 98%

Effect of grain-size on the ethanol vapor sensing properties of room-temperature sputtered ZnO thin films

et al. 2015

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We have investigated the gas sensing properties of ZnO thin films (100 to 200 nm thickness) deposited by roomtemperature radio frequency magnetron sputtering. The sensitivity of the films to ethanol vapor was measured in the 10 to 50 ppm concentration range at operating temperatures between 200 and 400°C. A synergetic effect of decreasing grain size and increasing operating temperature was observed towards the improvement of the sensitivity, reaching a value of 54 and a limit of detection as low as 0.61 ppm. The decrease in the grain size resulted in prolonged response time but faster recovery. In any case, both response time and recovery time are < 400 s. The results demonstrate that room-temperature magnetron sputtering is a viable approach to enhance the performances of ZnO films in sensors for ethanol vapor.

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Effect of Film Thickness on Structural, Electrical, and Optical Properties of Sol-Gel Deposited Layer-by-layer ZnO Nanoparticles

Cited by 61 publications

References 17 publications

Effect of Spin Coating Speed on Some Optical Properties of ZnO Thin Films

Effect of Spin Coating Speed on Some Optical Properties of ZnO Thin Films

Magnetic and Electrical Properties of Undoped and Holmium Doped ZnO Thin Films Grown by Sol-Gel Method

Effect of grain-size on the ethanol vapor sensing properties of room-temperature sputtered ZnO thin films

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