Effects of Low Ag Doping on Physical and Optical Waveguide Properties of Highly Oriented Sol-Gel ZnO Thin Films

Dehimi, M.; Touam, Tahar; Chelouche, A.; Boudjouan, F.; Djouadi, D.; Solard, Jeanne; Fischer, A.; Boudrioua, Azzedine; Doghmane, A.

doi:10.1155/2015/740208

Cited by 47 publications

(18 citation statements)

References 48 publications

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“…The optical absorption edge exhibits a red-shift with the rise of Ag doping concentration. The observed band gap narrowing is due to the existence of Ag impurities in the ZnO cells, which is in agreement with literature [24,25,43]. Figure 9 exhibits the room temperature photoluminescence spectra (excitation wavelength 325 nm) of undoped and Ag-doped ZnO thin films.…”

Section: Optical Analysissupporting

confidence: 88%

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Fabrication and Characterization of Highly Textured Thin Films of Undoped and Ag-Doped ZnO

et al. 2019

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Undoped and Ag-doped ZnO thin films with different silver concentrations (0, 1, 3, and 7 wt%) were synthesized by sol-gel method and deposited onto glass substrate by dip-coating technique. Zinc acetate dehydrate and silver nitrate were used as starting materials. 2-Methoxyethanol and ethanolamine were used as solvent and stabilizer. Characterization by X-ray diffraction has revealed that the undoped and Ag-doped ZnO are polycrystalline, and have the wurtzite hexagonal structure with a preferred orientation along c-axis. The nanometric size (27-34 nm) of ZnO crystallites varies with the concentration of Ag. The surface morphology analysis, by atomic force microscopy and scanning electron microscopy, depicts a homogeneous dispersion of ZnO crystallites in the form of randomly spread wrinkles-like formation. The Raman spectroscopy confirms the Ag incorporation in the ZnO lattice. All films exhibit a transmittance greater than 75% in the visible region, and a sharp absorption band at 325 nm corresponding to the fundamental absorption edge. The room-temperature photoluminescence spectra of the prepared thin films display a strong ultraviolet band at 380 nm originated from excitons recombination, and four bands in the visible region at 430 nm (violet), 460 nm, 480 nm (blue) and 530 nm (green) from created defect levels in the band gap. These synthesized materials may be potential candidates in the manufacture of devices using short wavelengths.

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Section: Optical Analysissupporting

confidence: 88%

“…00-36-1451 [23]. This result indicates a high preferential c-axis orientation of ZnO crystallites [24][25][26][27]. The third peak observed at 2θ = 36.35 • is also very weak and it is from the plane (101).…”

Section: X-ray Diffraction Analysismentioning

confidence: 98%

Fabrication and Characterization of Highly Textured Thin Films of Undoped and Ag-Doped ZnO

et al. 2019

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“…This may be caused by the interaction of particles through the van der Waals force, which causes the molecules to interact and bond with each other. Our results are in a good agreement with those of Dehimi et al (2015), which showed that the particle size of ZnO increased when Ag dopant was added to the ZnO particles during annealing, at a temperature of 500 o C. Kusdianto et al (2017) also report that particle size increased after adding the Ag nanoparticles to the TiO2 matrix due to the metalinduced crystallization phenomenon and the coalescence of particles. Furthermore, the heat transfer among the ZnO may be enhanced by the presence of Ag nanoparticles.…”

Section: Resultssupporting

confidence: 91%

Photocatalytic Activity of ZnO-Ag Nanocomposites Prepared by a One-step Process using Flame Pyrolysis

Kusdianto¹,

Widiyastuti²,

Nurtono³

et al. 2019

IJTech

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The degradation of organic pollutants using photocatalysis is more effective than conventional methods, with ZnO being the most widely used of the various semiconductor materials for application in photocatalysis. Unfortunately, degradation efficiency is inhibited by the electronhole recombination. The photocatalytic activity of ZnO can be enhanced by adding noble metals, such as Ag nanoparticles. However, the fabrication of ZnO˗Ag using liquid-phase processes is complicated and often requires multiple steps. In this study, the effects of Ag content, ranging from 0 to 20 wt%, in the photocatalytic activity of ZnO˗Ag nanocomposites are investigated. The nanocomposites were fabricated by a one-step process using flame pyrolysis and with zinc acetate and AgNO3 as the precursors. The nanocomposites were collected using an electrostatic precipitator and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and nitrogen adsorption-desorption of the Brunauer-Emmett-Teller (BET) specific surface area. The XRD results confirm the existence of Ag nanoparticles in the prepared nanocomposites, whose crystallite size was not significantly influenced by the presence of the nanoparticles. The SEM indicated that the morphology of the nanocomposites produced was spherical, with some aggregates. Particle size distribution of the nanocomposites increased with higher Ag content. The photocatalytic activity of the produced nanocomposites, estimated by evaluating the degradation of the methylene blue aqueous solution under UV irradiation, showed that the highest photocatalytic performance was attained when the concentration of Ag was equal to 5 wt%.

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“…It can be seen that as the Cu doping increases, the average crystallite size increases while the microstrian decreases which refers to improvement of the crystallinty and the reduction of the defects due to the completely integration of Cu 2+ ions into the CdTe lattice. Such increase in the average crystallite size and decrease in microstain is reported for films that have smaller ionic radius dopants [28].…”

Section: Structural and Microstructure Characterizationsmentioning

confidence: 52%

Microstrucral, Optical and Electrical Characteristics of Cu-doped CdTe Nanocrystalline Films for Desinging of Absorber Layer in Solar Cell Applications

Alzaid

Hadia

El-Hagary

et al. 2021

Preprint

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This paper reports the microstrcure, optical and electrical characteristics of undoped and Cu doped CdTe nanostructured thin films prepared on glass substrates by electron beam evaporation technique. The Crystallographic study of X-ray diffraction shows that CdTe and Cu doped CdTe films crystallize in the form of a cubic zinc blende structure. Microstructure analysis reveals that as the Cu doping level increases, the average crystallite size increases, while the microstrian decreases due to the improvement of the crystallinty, thereby reducing defects. XRD and AFM investigations confirmed the nanostructure characteristic of undoped and Cu doped films. It was found that the optical band gap energy increases from 1.485 eV to 1.683 eV as the Cu concentration increases from 0 wt. % to 10 wt. %, which may be related to the Burstein-Moss effect. The refractive index is calculated from the Swanepoel envelope method and found to decrease with the increase of the Cu doping due to the decrease in the prolizability. Similarly, the extinction coefficient decreases with the increase of Cu in CdTe matrix. The dc electrical conductivity is found to increase with increasing Cu doping, which is attributed to the increase in the grain size, thereby reducing the scattering of the grain boundary. Furthermore, two conduction mechanisms of the carrier transport in nanostrcutured undoped and Cu doped CdTe films were observed. The low temperature dependence of the conductivity of undoped and Cu doped CdTe nanostructured films is explained based on Mott’s variable range hopping conduction mechanism model (VRH). Interestingly, the calculated values of hopping distance R, the hopping energy W and the the density of states at the Fermi level N(EF) are consistent with the Mott's VRH. Finally, Hall effect measurements show that all the films have p- type conduction behavior. Besides, the results show that as Cu doping level increases, the carrier concentration and the Hall mobility increase due to the decrease in grain boundary scattering with the increase in grain size. Accordingly, it can be concluded that by increasing the Cu doping level in the CdTe film, the conductivity is increased, thereby improving the performance of the CdTe absorber layer in the solar cell structure.

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Effects of Low Ag Doping on Physical and Optical Waveguide Properties of Highly Oriented Sol-Gel ZnO Thin Films

Cited by 47 publications

References 48 publications

Fabrication and Characterization of Highly Textured Thin Films of Undoped and Ag-Doped ZnO

Fabrication and Characterization of Highly Textured Thin Films of Undoped and Ag-Doped ZnO

Photocatalytic Activity of ZnO-Ag Nanocomposites Prepared by a One-step Process using Flame Pyrolysis

Microstrucral, Optical and Electrical Characteristics of Cu-doped CdTe Nanocrystalline Films for Desinging of Absorber Layer in Solar Cell Applications

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