The Effect of Mn Incorporation on the Structural, Morphological, Optical, and Electrical Features of Nanocrystalline ZnO Thin Films Prepared by Chemical Spray Pyrolysis Technique

Yılmaz, Mehmet; Aydoğan, Ş.

doi:10.1007/s11661-015-2875-7

Cited by 36 publications

(12 citation statements)

References 43 publications

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“…The average lengths of the ZnO NRs with 0, 0.5 and 2% Mn concentrations were 0.799, 0.893 and 1.05 μm, respectively. The effect of doping Mn on the morphology of ZnO NRs was also presented in the previous reports [17,20]. For example, the 5 mol% Mn doped into ZnO NRs increased the diameter of the NRs from 85 to 150 nm and 2 at% Mn increased the diameter range of ZnO NRs from 120-400 nm to 120-700 nm [21].…”

Section: Morphological and Structural Analysissupporting

confidence: 64%

“…The decrease of the optical bandgap originated from the optically activated sub-levels formed by doping. This can be explained by the interaction between the d electron of an Mn atom and the s and p electrons of the host Zn atom (s-d and p-d interactions) that formed the new energy levels [20,[26][27][28]. Furthermore, the decrease in optical band gap under doping was explained by the presence of crystal defects, such as oxygen vacancies [30,31].…”

Section: Morphological and Structural Analysismentioning

confidence: 99%

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Enhanced Photocatalytic Activity Using Near Visible Light of ZnO Nanorods by Doping with Mn2+ Ions

Hoai Nhon,

Huu Khoa,

Thi Ngoc Huyen

et al. 2021

MaP

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ZnO is a promising photocatalyst for photocatalytic oxidation of organic compounds under the influence of sunlight that provides clean energy and decomposes sustainable organic pollutants substances. ZnO is found to have non-toxic properties, long-term stability, high carrier mobility, low cost and biocompatibility. However, some disadvantages of ZnO limit its use in photocatalysis. Due to its wide bandgap, ZnO can only be activated under UV illumination. On the other hand, the photo-excited electron-hole pairs that recombine quickly on ZnO surface, suppress its photocatalytic properties. To improve its properties and performance, doping with transition metals was used to improve the optical properties of ZnO. Among the transition metal ions, Manganese (Mn) was commonly used to improve and tune the optical, electrical, diameter, height, and the number of nanorods (NRs) per unit area. Introduction of Mn into ZnO could enhance the photocatalytic activity due to the increase in the defect sites that effectively decreased the recombination of free electrons and holes. This study successfully synthesized ZnO nanorod arrays generated on glass substrates with different concentrations of doping Mn (0, 0.5, 1, 1.5 and 2%) at 100 °C by a simple hydrothermal method. To investigate the structure, morphology and optical properties, ultraviolet-visible spectroscopy (UV-Vis), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were conducted. With the range of Mn doping ≤ 2% mol, the band gap reduced slightly, and the most optimized Mn doping concentration was of 0.5%. Overall, this work shows that the most effective way to increase ZnO’s photocatalytic activity in the visible region by reducing its band gap was the reduction in the size of the material or denaturation of ZnO by certain metals or non-metals.

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Section: Morphological and Structural Analysissupporting

confidence: 64%

Section: Morphological and Structural Analysismentioning

confidence: 99%

Enhanced Photocatalytic Activity Using Near Visible Light of ZnO Nanorods by Doping with Mn2+ Ions

Hoai Nhon,

Huu Khoa,

Thi Ngoc Huyen

et al. 2021

MaP

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“…41 However, this kind of band shrinkage in transition metal-doped II-IV semiconductors can be thought of as a result of the strong exchange interaction between the p and s electrons of the host band and the d electron of the Cr atoms. 39,42,43 The XPS investigations have been carried out in order to evaluate the chemical state of the host and the dopant elements, and the existence of Zn, Cr, and O elements in chromium-doped ZnO film are shown in Fig. 2b, c, and d after base line correction, as shown in the literature.…”

Section: Optical Propertiesmentioning

confidence: 99%

Investigation the Performance of Cr-Doped ZnO Nanocrystalline Thin Film in Photodiode Applications

Turşucu

Aydoğan

Koçyiğit

et al. 2022

JOM

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Undoped and Cr-doped zinc oxide (ZnO) thin films were deposited on the glass and p-Si substrates by the chemical spray pyrolysis technique. The films were characterized by x-ray diffractometry (XRD) and UV-visible spectrometry, and electrical characterization was achieved by using the films as an interfacial layer between the Au and p-Si. The XRD results confirmed the undoped and Cr-doped ZnO thin film crystalline structures. UV-visible spectra provided the transmittance plots and band gap energy values. I-V measurements were performed on the fabricated Au/ZnO/p-Si and Au/ZnO:Cr/p-Si devices to determine the effect of the ZnO interfacial layer on their performance. Various junction parameters, such as the ideality factor, barrier height, and series resistance, were calculated from the I-V measurements by various techniques, and have been discussed in detail. A 100-mW/cm 2 power intensity light was exposed on the Au/ZnO:Cr/p-Si device to see the photodiode behavior as well as to determine light sensitivity parameters such as photosensitivity and detectivity. The results highlight that the Au/ZnO:Cr/p-Si device can be thought of for optoelectronic applications.

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“…The effect of different parameters such as annealing temperature, substrate nature, Mn doping concentration on the physical properties of Mn-doped ZnO thin films using different physical and chemical methods of elaboration, such as pulsed laser deposition, [11][12][13] spray pyrolysis, [14,15] magnetron sputtering, [16,17] and sol-gel were widely studied. [18,19] However, very little research investigated the thickness effect of Mn-doped ZnO thin films that used rf magnetron sputtering method for preparation.…”

Section: Introductionmentioning

confidence: 99%

Thickness Effect on the Properties of 4% Mn‐Doped ZnO Thin Films Grown by Sol‐Gel Spin Coating Deposition

Boukhari

Deghfel

Mahroug

et al. 2021

Macromolecular Symposia

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In this study, the thickness effect of 4% Mn‐doped ZnO thin films on structural, optical, and morphological properties is investigated. The films are deposited on a glass substrate using the sol‐gel spin coating method. Phase analysis indicates that all films have a hexagonal wurtzite structure with a high preferential c‐axis orientation. All structural parameters are significantly influenced by the thickness variations. The optical analysis reveals that transmittance and band gap energy decrease with thickness. A red shift of the absorption edge is noticed. The surface morphology shows a good uniformity for all ZnO films. The surface roughness of the samples increases with film thicknesses. The photoluminescence (PL) spectra show a UV peak at 388 nm with two blue peaks at 438 and 475 nm and a weak green emission peak at 525 nm. A lower PL intensity is noticed by increasing the thickness. The obtained results exhibit similarities in behavior as other methods.

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The Effect of Mn Incorporation on the Structural, Morphological, Optical, and Electrical Features of Nanocrystalline ZnO Thin Films Prepared by Chemical Spray Pyrolysis Technique

Cited by 36 publications

References 43 publications

Enhanced Photocatalytic Activity Using Near Visible Light of ZnO Nanorods by Doping with Mn2+ Ions

Enhanced Photocatalytic Activity Using Near Visible Light of ZnO Nanorods by Doping with Mn2+ Ions

Investigation the Performance of Cr-Doped ZnO Nanocrystalline Thin Film in Photodiode Applications

Thickness Effect on the Properties of 4% Mn‐Doped ZnO Thin Films Grown by Sol‐Gel Spin Coating Deposition

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