The Structural, optical and electrical properties of nanocrystalline ZnO:Al thin films

Benhaoua, Boubaker; Rahal, Achour; Benramache, Said

doi:10.1016/j.spmi.2014.01.005

Cited by 52 publications

(17 citation statements)

References 37 publications

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“…The films were deposited at a substrate temperature of 350 • C. The optical properties of undoped ZnO thin film such a band gap energy and the Urbach energy were obtained from our previous paper [21], and various papers [22][23][24][25][26][27][28][29][30]; they have studied the effect of substrate temperature and precursor molarity on the structural and the optical properties of undoped ZnO thin films, these results are shown in Table 1 In this study, we will show the evolution of the precursor molarity on the Urbach energy and band gap energy, we tried to establish correlations for each model proposed. In our calculations, the Urbach energy can be calculated from precursor molarity and band gap energy of undoped ZnO thin films; the ZnO exhibit a single crystals exhibit n-type semiconductor with a high crystallinity.…”

Section: Tablementioning

confidence: 99%

Effect of optical gap energy on the Urbach energy in the undoped ZnO thin films

Belahssen

Temam

Lakel

et al. 2015

Optik

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Section: Tablementioning

confidence: 99%

Effect of optical gap energy on the Urbach energy in the undoped ZnO thin films

Belahssen

Temam

Lakel

et al. 2015

Optik

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“…In this study, the undoped and doped ZnO samples were deposited on glass substrates using the ultrasonic spray and spray pyrolysis techniques. In general, the depositions were performed at a substrate temperature of 350 ∘ C. The optical band gap energy and the Urbach energy of undoped and Bi, Sn and Fe doped ZnO thin films were taken from the literature [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44], which studied the effect of precursor molarity, doping level and substrate temperature on structural, electrical and optical properties of undoped and doped ZnO thin films with Bi, Sn and Fe. Table 1 shows the typical procedures of experimental research designs, which used zinc as a precursor.…”

Section: Experimental and Methodsmentioning

confidence: 99%

The calculation of the optical gap energy of ZnXO (X = Bi, Sn and Fe)

Benramache

Benhaoua

2016

Open Physics

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Abstract:In this paper, a new mathematical model has been developed to calculate the optical properties of nanomaterials a function of their size and structure. ZnO has good characterizatics in optical, electrical, and structural crystallisation; We will demonstrate that the direct optical gap energy of ZnO films grown by US and SP spray deposition can be calculated by investigating the correlation between solution molarity, doping levels of doped films and their Urbache energy. A simulation model has been developed to calculate the optical band gap energy of undoped and Bi, Sn and Fe doped ZnO thin films. The measurements by thus proposed models are in agreement with experimental data, with high correlation coefficients in the range 0.94-0.99. The maximum calculated enhancement of the optical gap energy of Sn doped ZnO thin films is always higher than the enhancement attainable with an Fe doped film, where the minimum error was found for Bi and Sn doped ZnO thin films to be 2,345 and 3,072%, respectively. The decrease in the relative errors from undoped to doped films can be explained by the good optical properties which can be observed in the fewer number of defects as well as less disorder.

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“…This meant both of thin film could absorb uv-light and visible light. Band gap energy of TiO2 thin film can be determined by plotting the absorption coefficient to the photon energy using Equation (1) [22]. (1) where α is absorption coefficient, A is constant, hυ is photon energy, and Eg is band gap energy.…”

Section: Optical Propertiesmentioning

confidence: 99%

“…(1) where α is absorption coefficient, A is constant, hυ is photon energy, and Eg is band gap energy. , 11 (3), 2016, 371 Copyright © 2016, BCREC, ISSN 1978-2993 Absorption coefficient α can be determined using Equation (2) [22]. (2) where A and d are absorbance and thickness film, respectively.…”

Section: Optical Propertiesmentioning

confidence: 99%

Reduction of Peroxide Value and Free Fatty Acid Value of Used Frying Oil Using TiO2 Thin Film Photocatalyst

Kaltsum

Kurniawan

Nurhasanah

et al. 2016

Bull. Chem. React. Eng. Catal.

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The quality of used frying oil degraded due to the presence of products degradation, such as; PV and FFA which formed during the frying process. PV and FFA are harmful to human health. The photocatalytic activity of TiO2 thin film has been applied in various fields, especially in the environment. The aim of this study is to evaluate photocatalytic activity of TiO2 thin film for reducing PV and FFA in used frying oil. The TiO2 thin films were deposited on glass substrate by spray coating method at a temperature of 450 o C. The TiO2 precursor solution was prepared by mixing TTiP, AcAc, and ethanol. The thin films were varied into two conditions; as-deposited and annealed at a temperature of 500 o C. The morphology, crystalline structure, and optical properties of the thin films were characterized by scanning electron microscope (SEM), X-ray Diffraction (XRD), and UV-VIS spectrophotometer, respectively. Photocatalytic process was carried out by putting TiO2 thin film in used frying oil and irradiated by sunlight. The result showed that both of TiO2 thin films were still amorphous in nature. However, there was a peak with low intensity for annealed TiO2 thin film which corresponding to the TiO2 anatase crystals plane of (101). Annealing process improved crystallinity and changed the shape morphology of TiO2 thin films. The band gap was found to be 3.59 eV for asdeposited TiO2 thin film and 3.49 eV for the annealed-TiO2 thin film. Photocatalytic process shows that TiO2 thin films reduced FFA and PV of used frying oil up to 67.10% and 79.15%, respectively. The photocatalytic activity of annealed TiO2 thin film was higher than as-deposited TiO2 thin film. The results indicated that TiO2 thin film photocatalyst potential as the new alternative method to purify used frying oil.

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The Structural, optical and electrical properties of nanocrystalline ZnO:Al thin films

Cited by 52 publications

References 37 publications

Effect of optical gap energy on the Urbach energy in the undoped ZnO thin films

Effect of optical gap energy on the Urbach energy in the undoped ZnO thin films

The calculation of the optical gap energy of ZnXO (X = Bi, Sn and Fe)

Reduction of Peroxide Value and Free Fatty Acid Value of Used Frying Oil Using TiO2 Thin Film Photocatalyst

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