BAHRI Deghfel

Ammar BOUKHARI

Elaboration, characterization and modeling of oxide-based nanostructured thin films

Benrezgua Elhadj

Synthèse, caractérisation et étude des propriétés de nanocomposites à base d'oxyde de zinc

Amari Rabie

Etude de l'effet de dopage sur les propriétés physiques et chimiques des semi-conducteurs à base d’oxyde synthétisées par la technique sol gel-spin coating

Bendjedi Ahlam

Etude des paramètres d'interaction des rayonnements ionisants avec la matière en vue des applications analytiques

MEHDDEB Asma

Study of the structural, electronic, elastic and optical properties of the CuFeO2 compound

ABDELLAHOUM Leila

Calculation of structural, electronic, elastic and optical properties of 2H-CuGaO2: First principle study

ROUBACHE Besma

Etude des propriétés structurales, électroniques, élastiques et optiques du composé 3R- CuGaO2

DECHOUCHA, SAMIYA

Sections efficaces semi-empiriques de production des couches M des éléments de numéros atomiques 60  Z  90 par des protons en vue des applications analytiques

First-principles calculations employing the density functional theory full-potential (linearized) augmented planewave plus local orbitals (FP-(L)/APW + lo) method were conducted to investigate the structural, electronic and optical characteristics of silver-based ternary oxides XAgO (X = Li, Na, K, and Rb). The GGA-PBEsol and TB-mBJ functionals were employed to describe the exchange-correlation potential. The optimized lattice parameters and atomic positions obtained from the calculations exhibit good agreement with both theoretical predictions and experimental measurements. Various exchange-correlation functionals were employed to evaluate the electronic properties, revealing that the newly developed Tran–Blaha modified Becke–Johnson functional yields a significant improvement in the band gap value. All XAgO compounds under consideration are categorized as semiconductor materials where the band gap value decreases as the atomic size of the X element increases. The study also explored the total and site-projected l-decomposed densities of states. Additionally, the complex dielectric function, refractive index, extinction coefficient, reflectivity, and loss function spectra were calculated for the incident radiation polarized parallel to both the [100] and [001] crystalline directions. The interband transitions that contribute effectively to the observed peaks in the imaginary part of the dielectric function were identified.

Citation

Bahri DEGHFEL , , (2023-12-30), A first-principles investigation on the structural, electronic and optical characteristics of tetragonal compounds XAgO (X= Li, Na, K, Rb), Computational Condensed Matter, Vol:38, Issue:12, pages:e00876, Elsevier B.V.

First-principles calculations employing the density functional theory full-potential (linearized) augmented planewave plus local orbitals (FP-(L)/APW + lo) method were conducted to investigate the structural, electronic and optical characteristics of silver-based ternary oxides XAgO (X = Li, Na, K, and Rb). The GGA-PBEsol and TB-mBJ functionals were employed to describe the exchange-correlation potential. The optimized lattice parameters and atomic positions obtained from the calculations exhibit good agreement with both theoretical predictions and experimental measurements. Various exchange-correlation functionals were employed to evaluate the electronic properties, revealing that the newly developed Tran–Blaha modified Becke–Johnson functional yields a significant improvement in the band gap value. All XAgO compounds under consideration are categorized as semiconductor materials where the band gap value decreases as the atomic size of the X element increases. The study also explored the total and site-projected l-decomposed densities of states. Additionally, the complex dielectric function, refractive index, extinction coefficient, reflectivity, and loss function spectra were calculated for the incident radiation polarized parallel to both the [100] and [001] crystalline directions. The interband transitions that contribute effectively to the observed peaks in the imaginary part of the dielectric function were identified.

Citation

Djamel ALLALI , SABER SAAD ESSAOUD , Bahri DEGHFEL , Rabie AMARI , Abdelmadjid Bouhemadou, , (2023-12-30), A first-principles investigation on the structural, electronic and optical characteristics of tetragonal compounds XAgO (X = Li, Na, K, Rb), Computational Condensed Matter, Vol:38, Issue:, pages:e00876, Elsevier

ZnO and ZnO doped-Ag nanoparticles have been successfully produced using the coprecipitation method. Literature studies show that Ag doping into ZnO matrix can enhance its various properties [2, 3]. Zinc acetate dihydrate [Zn (CH3COO)2 2H2O], silver nitrate [AgNO3] and sodium hydroxide solution [NaOH] were used as precursors. To obtain homogeneous solution, stoichiometric amount of zinc and nickel acetate were dissolved in methanol and then stirred continuously on a magnetic stirrer at room temperature. To raise the pH of the obtained solution to ~9, a small amount of sodium hydroxide solution [NaOH] was added drop by drop. The obtained solution is then stirred again until the liquid solution turns into a gel. Then, the beaker was transferred on the hot plate at 500°C for 1h. The structural, morphological, electronic, optical and vibrational properties were examined. The analysis confirmed that all nanoparticles possessed a hexagonal wurtzite crystalline structure, with particle size being influenced by the presence of Ag. The particles exhibited a preference for orientation along the (002) axis. The shift in peak positions towards higher angles suggested that the Ag might replace Zn ions in the ZnO lattice. The surface structure of the nanoparticles displayed a combination of spherical and hexagonal shapes.

Citation

Bahri DEGHFEL , ,(2023-12-20), Study of Structural, Electronic and Optical Properties of Ag Doped ZnO Nanoparticles by Co-precipitation Method,1st National Conference on Matter Sciences,Djelfa, Algeria

Pure and Mn-doped zinc oxide thin films at contents x =10% were synthesized by sol–gel spin coating process and investigated using various techniques. both samples have wurtzite hexagonal phase, which wasn’t altered and getting relaxed by Mn-doping. The grain size decreased and did not change its growth mode in 10%Mn doping. at x= 10 %, the transparency of films was decreased in the visible region and the band gap energy (Eg) presented a slight shrinking. Photoluminescence spectra showed ultraviolet with strong and weak blue and weak green emission peaks. Keywords: Mn-doped ZnO, Thin films, Sol-gel technique, Spin coating method. References : 1. R. Amari, B. Deghfel, A. Mahroug, A.A. Mohamad, A. Boukhari, N. Selmi, Effects of Mn doping on the structural, morphological, electronic and optical properties of ZnO thin flms by sol-gel spin coating method: an experimental and DFT+U study, Phys. B Condens. Matter 577 (2020) 411766. 2. Benrezgua, E., Deghfel, B., Zoukel, A., Basirun, W. J., Amari, R., Boukhari, A., Yaakob, M. K., Kheawhom , S., & Mohamad, A. A. (2022). Synthesis and properties of copper doped zinc oxide thin films by sol-gel, spin coating and dipping: A characterization review. Journal of Molecular Structure, 1267, 133639. 3. A. Mahroug, R. Amari, A. Boukhari, B. Deghfel, L. Guerbous, N. Selmi, Synthesis, structural , morphological , electronic, optical and luminescence properties of pure and manganese-doped zinc oxide nanostructured thin flms: effect of doping .J. Nanoelectron. Optoelectron . 13 (2018) 732–742.

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Bahri DEGHFEL , ,(2023-12-20), Structural, optical and photoluminescence Properties of ZnO pure and Mn-Doped ZnO Thin Films Grown by Sol-Gel Spin Coating Deposition,1st National Conference on Matter Sciences,Djelfa, Algeria

Electronic and optical properties of of AgBaBr3 Perovskites has been calculated using an ab initio study with the Tran-Blaha- modified Becke-Johnson density functional. the obtained results have been compared with available theoretical and experimental results. A good agreement has been found.

Citation

Bahri DEGHFEL , ,(2023-12-02), Electronic and optical properties of of AgBaBr3 Perovskites: An ab initio study with the Tran-Blaha- modified Becke-Johnson density functional,1st National Conference on Physics and its Applications,Bousaada, Algeria

Structural and electronic properties of AgBeC13 Perovskites: DFT based First-principles calculations

Citation

Bahri DEGHFEL , ,(2023-12-02), Structural and electronic properties of AgBeC13 Perovskites: DFT based First-principles calculations,1st National Conference on Physics and its Applications,Bousaada, Algeria

In this work, the Cambridge Serial Total Energy Package CASTEP within Density Functional Theory (DFT) is used to study the structural and electronic properties of cubic silver based perovskite AgXCl3 (X= Be; space group pm-3m (221)). The structural investigation reveals the stability of these compounds. The band structure and density of states indicates the semiconducting nature of the compound.The study reveals the potential as candidates for optoelectronic devices.

Citation

AMMAR Boukhari , Rabie AMARI , Djamel ALLALI , Bahri DEGHFEL , ,(2023-12-02), Structural and electronic properties of AgBeCl3 Perovskites: DFT based First-principles calculations,THE 1ST NATIONAL CONFERENCE ON PHYSICS AND IT’S APPLICATIONS,BOUSAADA

The present research utilizes ab initio computations to examine the thermodynamic, structural, and elastic characteristics of XAgO ternary oxides, where X signifies Li, Na, K, and Rb.The GGA-PBE and GGA-WC functionals were used to calculate the ground-state lattice parameters and atomic position coordinates of the title materials. The calculated results were in good agreement with both experimental measurements and theoretical predictions. This suggests that the GGA-PBE and GGA-WC functionals are accurate for describing the structural properties of the material under study.This study offers computational predictions for the elastic properties of monocrystalline structures and polycrystalline aggregates of XAgO compounds. These predictions encompass various key parameters, including single-crystal elastic constants, Young's modulus, bulk modulus, Lame coefficients, Poisson's ratio, shear modulus, and Debye temperature. Additionally, the quasi-harmonic Debye approximation is utilized to explore the temperature-dependent behavior of bulk modulus, Debye temperature, volume thermal expansion coefficient, and isobaric and isochoric heat capacities over an extensive temperature range, while maintaining constant pressures. The results obtained from this model are found to be highly successful in accurately predicting the behavior of these properties.

Citation

Djamel ALLALI , Rabie AMARI , AMMAR Boukhari , Bahri DEGHFEL , SABER SAAD ESSAOUD , Abdelmadjid Bouhemadou, Saad Bin-Omran, Missoum Radjai, Rabah Khenata, Yarub Al-Douri, , (2023-10-04), Ab initio investigation of structural, elastic, and thermodynamic characteristics of tetragonal XAgO compounds (X = Li, Na, K, Rb), Physica Scripta, Vol:98, Issue:11, pages:115905, IOPscience

The present research utilizes ab initio computations to examine the thermodynamic, structural, and elastic characteristics of XAgO ternary oxides, where X signifies Li, Na, K, and Rb.The GGA-PBE and GGA-WCfunctionals were used to calculate the ground-state lattice parameters and atomic position coordinates of the title materials. The calculated results were in good agreement with both experimental measurements and theoretical predictions. This suggests that the GGA-PBE and GGAWCfunctionals are accurate for describing the structural properties of the material under study.This study offers computational predictions for the elastic properties of monocrystalline structures and polycrystalline aggregates of XAgO compounds. These predictions encompass various key parameters, including single-crystal elastic constants, Young’s modulus, bulk modulus, Lame coefficients, Poisson’s ratio, shear modulus, and Debye temperature. Additionally, the quasi-harmonic Debye approximation is utilized to explore the temperature-dependent behavior of bulk modulus, Debye temperature, volume thermal expansion coefficient, and isobaric and isochoric heat capacities over an extensive temperature range, while maintaining constant pressures. The results obtained from this model are found to be highly successful in accurately predicting the behavior of these properties.

Citation

Djamel ALLALI , AMMAR Boukhari , Rabie AMARI , Bahri DEGHFEL , SABER SAAD ESSAOUD , Bouhemadou Abdelmadjid, , (2023-10-04), Ab initio investigation of structural, elastic, and thermodynamic characteristics of tetragonal XAgO compounds (X = Li, Na, K, Rb), Physica scripta, Vol:98, Issue:, pages:115905, IOPscience

In the present study, transition metal Al-doped ZnO nanoparticles (TM-ZN NPs) were synthesized via the chemical co-precipitation method. The structural, morphological, electronic, optical, vibrational as well as the photocatalytic properties of the elaborated TMZO-NPs, are then investigated. Hexagonal wurtzite crystallinity of all elaborated NPs is confirmed by the phase analysis and particle size is found to be affected by TM doping. XRD peak shows that all samples prefer orientation along (002) axis and TM (Al) may substitute ZnO structure as the peaks shift toward higher angles. The surface morphology of all samples exhibits mixture of spheroid-like and hexagon-like shaped structures. FTIR analyses are carried out to identify the important bands attributed to TM-O and Zn-O stretching vibration modes. The absorption intensity and edge are found affected by adding TM dopant. Degradation by pure ZnO and TMZO NPs of the methylene blue is investigated after 90 min UV light exposure. TM dopant affects the degradation of MB dye, where a high percentage (97.14%) being achieved after reasonable time of exposure (90 min) under UV light for Aluminum doped ZnO nanoparticles (AlZO NPs).

Citation

Rabie AMARI , ELHADJ Benrezgua , Bahri DEGHFEL , AMMAR Boukhari , Djamel ALLALI , Siassi A, ,(2023-08-16), Studies on photocatalytic performance applications of undoped and Al-doped ZnO nanoparticles,NANO-2023,Bukovel, UKRAINE

In this study, we conducted an ab initio investigation of the structural, electronic and optical properties of AgCaBr3 and AgSrBr3 Calcium-based halide perovskites. using the full-potential linearized augmented plane-wave (FP-LAPW+lo) method [1] basis set as implemented in the WIEN2k code [2].Calculated structural parameters, including the lattice constants (a), bulk modulus (B) and its pressure derivative (B'), for the considered compounds using both the local density (LDA) [3] and generalized gradient approximations (GGA–PBEsol) [4] are consistent with the available data in the scientific literature. To calculate the electronic properties, the exchange-correlation potential is treated with various functionals, and we find that the newly developed Tran–Blaha-modified Becke–Johnson (TB-mBJ) [5–7] functional significantly improves the band gap. Band structure, total and site-projected l-decomposed densities of states, charge-carrier effective masses, charge transfers and charge density distribution maps were obtained; analyzed and compared with the available theoretical data. The frequency-dependent complex dielectric function, absorption coefficient, refractive index, extinction coefficient, reflectivity and electron energy loss function spectra were calculated. The origins of the peaks and structures in the optical spectra are determined in terms of the calculated energy band structures.

Citation

Djamel ALLALI , Rabie AMARI , Bahri DEGHFEL , AMMAR Boukhari , ,(2023-08-16), Electronic and optical properties of of AgXBr3 (X = Ca and Sr) Perovskites: An ab initio study with the Tran–Blaha-modified Becke–Johnson density functional,NANO-2023,Bukovel, UKRAINE

In this study, we conducted an ab initio investigation of the structural, electronic and optical properties of AgCaBr3 and AgSrBr3 Calcium-based halide perovskites. using the full-potential linearized augmented plane-wave (FP-LAPW+lo) method [1] basis set as implemented in the WIEN2k code [2].Calculated structural parameters, including the lattice constants (a), bulk modulus (B) and its pressure derivative (B'), for the considered compounds using both the local density (LDA) [3] and generalized gradient approximations (GGA–PBEsol) [4] are consistent with the available data in the scientific literature. To calculate the electronic properties, the exchange-correlation potential is treated with various functionals, and we find that the newly developed Tran–Blaha-modified Becke–Johnson (TB-mBJ) [5–7] functional significantly improves the band gap. Band structure, total and site-projected l-decomposed densities of states, charge-carrier effective masses, charge transfers and charge density distribution maps were obtained; analyzed and compared with the available theoretical data. The frequency-dependent complex dielectric function, absorption coefficient, refractive index, extinction coefficient, reflectivity and electron energy loss function spectra were calculated. The origins of the peaks and structures in the optical spectra are determined in terms of the calculated energy band structures. 1. Cottenier S. Density Functional Theory and the Family of (L)APW-methods: aStep-bystep Introduction // Instituut voor Kern-en Straling sfysica, KU Leuven, Belgium 4,second ed., ISBN-2002-2013.-978-90.- P. 807215-807222. 2. Blaha P., Schwarz K., Madsen G., Kvasnicka D., Luitz J. WIEN2k:An Augmented Plane Wave Plus Local Orbitals Program for Calculating Crystal Properties // Vienna University of Technology, Institute of Materials Chemistry Getreidemarkt, Vienna, Austria-2017.- 9/165-TC A-1060. 3. Perdew J.P., Wang Y. Accurate and simple analytic representation of the electron-gas correlation energy // Phys. Rev. B-1992.-45.- P. 13244-13249. 4. Perdew J.P., Ruzsinszky A., Csonka G.I., Vydrov O.A., Scuseria G.E., Constantin L.A., Zhou X., Burke, K. Restoring the Density-Gradient Expansion for Exchange in Solids and Surfaces // Phys. Rev. Lett.-2008.-100.- P. 136406-136410.

Citation

Bahri DEGHFEL , ,(2023-08-16), Electronic and optical properties of of AgXBr3 (X = Ca and Sr) Perovskites: An ab initio study with the Tran–Blaha-modified Becke–Johnson density functional,11th International Conference “Nanotechnologies and Nanomaterials” (NANO-2022),Ukraine

AN AB INITIO STUDY OF THE STRUCTURAL, ELASTIC, ELECTRONIC AND OPTICAL PROPERTIES OF AgCaX3 (X = Br, and F) PEROVSKITES have been claculated using DFT. The obtained results have been compared with available experimental and theoretical results. A good agreement is obtained.

Citation

Bahri DEGHFEL , ,(2023-06-15), AN AB INITIO STUDY OF THE STRUCTURAL, ELASTIC, ELECTRONIC AND OPTICAL PROPERTIES OF AgCaX3 (X = Br, and F) PEROVSKITES,4th INTERNATIONAL MEDITERRANEAN CONGRESS,Nicosia-Cyprus, Turkey

The study successfully produced ZnO and ZnO nanoparticles doped with transition metals (TMZO-NPs) using the coprecipitation method. Various properties of these nanoparticles were examined, including their structure, morphology, electronic behavior, optical characteristics, vibrations, and photocatalytic abilities. The analysis confirmed that all nanoparticles possessed a hexagonal wurtzite crystalline structure, with particle size being influenced by the presence of transition metals (Al, Ag, Cu, Mn). The particles exhibited a preference for orientation along the (002) axis. The shift in peak positions towards higher angles suggested that the TM might replace Zn ions in the ZnO lattice. The surface structure of the nanoparticles displayed a combination of spherical and hexagonal shapes. Further analysis identified important bands related to the stretching modes of TM-O and Zn–O bonds. The absorption properties and edges were also affected by the presence of TM. In the degradation study, both pure ZnO and TMZO-NPs were tested for their ability to break down methylene blue (MB) under UV light exposure for 90 min. Among the nanoparticles, Al-doped ZnO (AlZO-NPs) demonstrated the highest degradation efficiency, achieving 97.14% removal of MB within the given exposure time. The photocatalytic process followed a pseudo-first-order kinetics, indicating a strong correlation. This suggests that AlZO-NPs hold promise as a material for use in photocatalytic applications.

Citation

Bahri DEGHFEL , , (2023), Coprecipitation synthesis of transition metal (Al, Mn, Cu, Ag) doped zinc oxide nanopowders: characterization, photocatalytic test, and comparison study, Journal of the Australian Ceramic Society, Vol:11, Issue:, pages:7, Springer Link

The structural, elastic, electronic, and magnetic properties of the CrCoSi, MnCoSi parent half-Heusler (HH) alloys, and their CrMnCo2Si2 derivative double half-Heusler (DHH) compound are studied, utilizing the augmented plane wave method, which is based on density functional theory and implemented in the WIEN2k code. The stability of HH structure of the CrCoSi and MnCoSi alloys has been checked for their non-magnetic and ferromagnetic phases, leading to that the latter phase of the type I arrangement is the most stable. The CrMnCo2Si2 DHH alloy, derivative from the found structural and magnetic ground states of CrCoSi and MnCoSi HH alloys, is constructed and investigated. This DDH as well as its CrCoSi parent HH are found to be resistant to deformation and can be classified as ductile materials, whereas the MnCoSi compound is brittle. By the gradient generalized approximation (GGA), the electronic structures of CrCoSi, MnCoSi, and CrMnCo2Si2compounds exhibit a metallic behavior in the spin-up channel and a semiconducting behavior in the spin-dn channel, with band gaps (half-metallic gaps) of 0.851(0.020), 0.852(0.021), and 0.531(0.002) eV, respectively. The half-metallicity of CrMnCo2Si2 DHH is retained with smaller (larger) band gap (half-metallic gap) of 0.38(0.106) eV than that of GGA, using GGA + U approximation. In addition, the total magnetic moments are found to be 1, 2, and 3 μB for CrCoSi, MnCoSi, and CrMnCo2Si2, respectively. Therefore, these alloys can be good candidates for spinitronic applications due to their half-metallicity.

Citation

Bahri DEGHFEL , , (2023), Half-metallicity from CrCoSi and MnCoSi half-Heusler alloys to their derivative double half-Heusler CrMnCo2Si2, Canadian Journal of Physics, Vol:10, Issue:112, pages:1-8, Canadian Science Publishing

The present research utilizes ab initio computations to examine the thermodynamic, structural, and elastic characteristics of XAgO ternary oxides, where X signifies Li, Na, K, and Rb.The GGA-PBE and GGA-WC functionals were used to calculate the ground-state lattice parameters and atomic position coordinates of the title materials. The calculated results were in good agreement with both experimental measurements and theoretical predictions. This suggests that the GGA-PBE and GGAWC functionals are accurate for describing the structural properties of the material under study.This study offers computational predictions for the elastic properties of monocrystalline structures and polycrystalline aggregates of XAgO compounds. These predictions encompass various key parameters, including single-crystal elastic constants, Young’s modulus, bulk modulus, Lame coefficients, Poisson’s ratio, shear modulus, and Debye temperature. Additionally, the quasi-harmonic Debye approximation is utilized to explore the temperature-dependent behavior of bulk modulus, Debye temperature, volume thermal expansion coefficient, and isobaric and isochoric heat capacities over an extensive temperature range, while maintaining constant pressures. The results obtained from this model are found to be highly successful in accurately predicting the behavior of these properties.

Citation

Bahri DEGHFEL , , (2023), Ab Initio Investigation of Structural, Elastic, and Thermodynamic Characteristics of Tetragonal XAgO Compounds (X= Li, Na, K, Rb)., Physica Scripta, Vol:98, Issue:10, pages:115905, IOP Publishing

Nanoparticles (NPs) synthesized by the co-precipitation technique show many attractive properties such as small particle size, high crystallinity, high average pore diameter and high specific surface area. However, numerous reports show that some characteristics of the Ni-doped ZnO (NZO) NPs remain controversial such as optical bandgap (Eg), surface morphology and defect level. In this study, pure ZnO and NZO NPs at different Ni contents (x) were successfully prepared using the co-precipitation method. Phase analysis confirms the hexagonal wurtzite crystallinity of the samples. XRD peak shows that the Ni may substituted ZnO structure as the peaks shift toward higher angles with increasing x. Meanwhile, the formation of NiO secondary phases was significant at 12.50% Ni content. Densely packed spherical shaped structures with nanoparticle agglomeration are observed at low x, while some nanorod shaped structures appear at higher x. The stretching vibrations of the Zn–O bond are observed in the NZO NPs. The absorption edge shifts to higher wavelengths with the increase in x. This study provides consistent results in the phase analysis, morphology and structural parameters. The decrease in Eg agrees with the photoluminescence measurements. The emission spectra confirm the presence of interstitial zinc and singly ionized oxygen vacancies.

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Rabie AMARI , ELHADJ Benrezgua , Bahri DEGHFEL , AMMAR Boukhari , Zoukel Abdelhalim, Mohamad kamil Yaakob, wan Jeffrey bassirun, Soorathep Kheawhom, Ahmad Azmin Mohamad, , (2022), Ni doping effect on the electronic, structural and optical properties of ZnO nanoparticles prepared by Co-precipitation route, Optical Materials, Vol:128, Issue:, pages:112398, Elsevier

Numerous studies on Cu-doped ZnO (CZO) thin film doped as a p-type material have been reported due to its applications in optoelectronic and gas sensing devices. The synthesis and fabrication of CZO thin films by various techniques have been reported, but the sol-gel technique for both spin and dip coating has attracted much attention due to its safety, low cost and simple deposition equipment on a large surface-area. Motivated by the fact that reviews on CZO thin films have not been reported yet, this review summarizes the main chemical processes used in the fabrication of CZO thin films with special focus on the sol-gel synthesis involving several chemical and physical parameters such as solvent, additive, solution stirring and aging time, substrate and coating method which includes both dip and spin coating. It also highlights the various parameters influencing the structural, morphological, electronic, optical, vibrational and magnetic properties of the CZO thin films. For this purpose, a summary of various parameters of CZO thin films, reported in the literature survey of the past ten years (2010–2020), is tabulated and discussed. The influence of Cu doping on the synthesis and properties of CZO thin films is also reviewed. The structural, electronic, optical, magnetic and vibrational properties, as well as the elemental composition and surface morphology of the CZO thin films are also discussed. At the end of this review, an outlook is presented to gain more insights into the combined effects of the method-preparation-dopant combination on the properties of CZO thin films for future potential applications. This review should be a useful benchmark for researchers to explore the various physicochemical properties of CZO, their dependence on the experimental conditions and applications.

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ELHADJ Benrezgua , Bahri DEGHFEL , Rabie AMARI , AMMAR Boukhari , Zoukel Abdelhalim, Wan Jeffrey Basirun, Muhamad Kamil Yaakob, Soorathep kheawhom, Ahmad Azmin Mohamad, , (2022), Synthesis and properties of copper doped zinc oxide thin films by sol-gel, spin coating and dipping: A characterization review, Journal of Molecular Structure, Vol:1267, Issue:, pages:133639, Elsevier

Some efforts have been made on Cu-doped ZnO (CZO) structures to study the electronic, structural, magnetic and optical properties from first-principles calculations by different computer codes. This is very interesting to review in detail about CZO structures. A summary of the convergence criteria of geometry optimization for CZO structures from the literature survey (2010–2021) is tabulated and discussed. The impact of the Hubbard-U scheme in the exchange-correlation functional on the standard Density Functional Theory (DFT) miscalculation for CZO properties is comprehensively reviewed. The inclusion of Ud-Zn, Ud-Cu and Up-O all to gather leads to a correct energy band gap, and exhibits a slight effect on the lattice constant. The values of Ud-Zn, Ud-Cu and Up-O have a considerable impact on the intensity and position of the main peaks of the imaginary part. The magnetic phase of the CZO structure is found to be influenced by both Ud,Zn and Ud,Cu. More attention is paid to the influence of Cu doping content on CZO properties, including electronic, structural, optical and magnetic properties. The magnetic moment mainly comes from Cu ions with little contribution from O ions. Ferromagnetic (FM) spin ordering of Cu ions are suggested to be mediated by the holes induced in p-d hybridization. Finally, some perspectives for future studies are discussed as well.

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ELHADJ Benrezgua , Bahri DEGHFEL , AMMAR Boukhari , Rabie AMARI , Abdelhalim Zoukel, Soorathep kheawhom, Ahmad Azmin Mohamad, , (2022), A Review on DFT+ U Scheme for Structural, Electronic, Optical and Magnetic Properties of Copper Doped ZnO Wurtzite Structure, Materials Today Communication, Vol:31, Issue:, pages:103306, Elsevier

Ab initio full-potential (linearized) augmented plane-wave plus local orbitals (FP-(L)APW + lo) calculations are performed to study the hydrostatic pressure dependence of the mechanical and thermodynamics properties of GeMg2O4, GeZn2O4, and GeCd2O4 cubic spinels. The calculated equilibrium structural parameters using both the local density approximation and the generalized gradient approximation are well consistent with the available theoretical and experimental data in the literature. The monocrystalline elastic constants are predictet using the energy-strain scheme. The polycrystalline elastic moduli are determined from the monocrystalline elastic constants through the Voigt-Reuss-Hill approximations. To understand the mechanical behavior of the investigated compounds, assessments of their mechanical stability, ductility/brittleness, sound velocities, elastic anisotropy, pressure-dependent elastic constants, and Debye temperature are made. Regarding thermodynamic properties, temperature dependence of the lattice parameter, bulk modulus, isochoric and isobaric heat capacities, volume thermal expansion coefficient, and Debye temperature at different fixed pressures are explored through the quasi-harmonic Debye model coupled with the FP-(L)APW + lo approach.

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Djamel ALLALI , Bahri DEGHFEL , fares.zerarga@univ-bejaia.dz, abdelmadjid.bouhemadou@univ-setif.dz, , (2022), Ab initio study of the pressure dependence of mechanical and thermodynamic properties of GeB2O4 (B= Mg, Zn and Cd) spinel crystals, Computational Condensed Matter, Vol:32, Issue:, pages:e00705, Elsevier B.V.

The aim of this contribution is to investigate the different empirical procedures to deduce the L lines x-ray production cross sections for a wide range of elements (50≤Z ≤ 92) by proton impact. The data base which relies on different compilations available in the literature, is used from three different aspects, to deduce a new empirical production cross sections of the main x-ray lines Lα, Lβ and Lγ. One, the data are fitted collectively by analytical functions to calculate the empirical cross sections. Second, three dimensional empirical L-shell x-ray production cross sections have been deduced by introducing the dependence of the universal trend of the updated experimental data on the atomic number of the target, noted as “Z-dependence”. Third, these experimental data can be presented in a single curve depending on a scaling law extracted from studies in the most familiar theories of collision (PWBA). Then, a first order exponential decay function was used to fit very well the existing database of the main x-ray lines Lα, Lβ and Lγ cross sections for elements from 50Sn to 90U. Generally, the deduced production cross sections obtained by fitting the available experimental data for each element separately give the most reliable values than those obtained by a global fit. At last, a comparison is made between the three empirical formula reported in this work, those obtained using the ECPSSR model and other earlier works.

Citation

Bahri DEGHFEL , , (2022), Universal empirical fit to Lα, Lβ and Lγ x-ray production cross section by protons impact within updated experimental data: Three dimensional (Z-dependence), collective and individual formulae, Radiation Physics and Chemistry, Vol:190, Issue:, pages:109823, Elsevier Ltd.

Zn0.875Al0.125O nanoparticles are fabricated by a co-precipitation technique using zinc acetate dehydrate [Zn(CH3COO)2•2H2O] and aluminum nitrate nonahydrate(Al(NO3)39(H2O) as a starting material and doping source. X-ray diffraction, ultraviolet-visible spectroscopy and photoluminescence spectroscopy are employed to investigate the effect of Al doping on the structural, electronic and optical properties of ZnO nanoparticles. The obtained results are compared with those using first-principles calculation based on density functional theory (DFT) with local density approximation (LDA) plus Hubbard U (DFT–LDA+U) method. This latter represents the theoretical framework to deal with strongly correlated materials to predicted successfully the electronic properties of such materials. Keywords: Coprecipitation technique; Al-doped ZnO nanoparticles; DFT.

Citation

Bahri DEGHFEL , ,(2022), Theoretical and experimental study of structural, electronic and optical properties of Al doped ZnO nanoparticles by co-precipitation method,10th International Conference on Materials Sciences And Technology, (MatScience-2022),khenchela, Algeria

Zn0.875Al0.125O nanoparticles are fabricated by a co-precipitation technique using zinc acetate dehydrate [Zn(CH3COO)2•2H2O] and aluminum nitrate nonahydrate(Al(NO3)39(H2O) as a starting material and doping source. X-ray diffraction, ultraviolet-visible spectroscopy and photoluminescence spectroscopy are employed to investigate the effect of Al doping on the structural, electronic and optical properties of ZnO nanoparticles. The obtained results are compared with those using first-principles calculation based on density functional theory (DFT) with local density approximation (LDA) plus Hubbard U (DFT–LDA+U) method. This latter represents the theoretical framework to deal with strongly correlated materials to predicted successfully the electronic properties of such materials.

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Djamel ALLALI , Rabie AMARI , Bahri DEGHFEL , ,(2022), Electronic, structural, magnetic and optical properties of of spinel compound MgFe2O4,10th International Conference on Materials Sciences And Technology, (MatScience-2022),khenchela, Algeria

In this work, 8.5% Cu-doped ZnO thin film was fabricated on glass substrate using sol–gel spin coating method, in order to investigate the structural, optical and morphological properties. XRD result exhibited that the deposited thin film has a hexagonal wurtzite structure with a preferential orientation along the (0 0 2) c-axis orientation. The grain size, lattice constants, FWHM and strain of the film were calculated. To characterize the electronic and optical properties, UV-Vis spectra were used. The results indicate that the average transmittance is 74.68% in the visible range. The optical band gap energy was found to be 3.317 eV. The surface morphology showed a mixer of spheroid-like and rod-like nanoparticles (granules) randomly distributed.

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AMMAR Boukhari , ELHADJ Benrezgua , Rabie AMARI , Djamel ALLALI , Bahri DEGHFEL , ,(2022), Structural, morphological and optical properties of Cu-doped ZnO thin films prepared by sol-gel spin coating method,1st international conference on chemical matters and environment preservation IC-CMEP’22,Ouargla, Algeria

In this work, pure and Ni-doped ZnO nanoparticles (NPs) with concentration of Ni (6.25%) were successfully prepared by using co-precipitation method [1]. Among TM, nickel is very significant element which has a similar ionic radius as that of Zn. Literature studies show that Ni doping into ZnO matrix can enhance its various properties [2, 3]. Zinc acetate dihydrate [Zn (CH3COO)2 2H2O], nickel acetate dihydrate [Ni (CH3COO)2 2H2O] and sodium hydroxide solution [NaOH] were used as precursors. For getting homogeneous solution, stoichiometric amount of zinc and nickel acetate were dissolved in methanol, after stirred continuously on a magnetic stirrer at room temperature. For raising the pH of the obtained solution to ~9, small amount of sodium hydroxide solution [NaOH] was added drop by drop. The precursor solution is then stirred again until the liquid solution turns into a gel. After gel formation, the beaker was transferred on the hot plate at 500°C for 1h. The obtained sample yield in the form of loose powder was then finely grounded by agate mortar and pestle. The prepared samples in powder form were characterized by X-ray diffraction spectroscopy (XRD), Scanning Electron Microscopy (SEM), Ultraviolet–visible spectroscopy (UV-Vis), Photoluminescence (PL) and Fourier transform infrared spectroscopy (FTIR). The obtained results have been discussed and compared with those from other sources whatever possible.

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Rabie AMARI , ELHADJ Benrezgua , Bahri DEGHFEL , AMMAR Boukhari , ,(2022), Studies on structural, morphological, optical, luminescence and electronic properties of Ni-doped ZnO nanopowder by co-precipitation method,1st international conference on chemical matters and environment preservation IC-CMEP’22,Ouargla, Algeria

The first-principles method based on DFT with semiempirical Hubbard U scheme was applied to calculate the structural, elastic, electronic, and optical properties of ZnO wurtzite material. The effective Hubbard U values of 5.5 eV and 8 eV were used for Zn 3d and O 2p states, respectively. Electronic band structures and their corresponding total and partial density of states diagram were calculated. The optimized lattice parameters were a=b= 3,234 Å and c= 5,201 Å. The elastic stiffness constants of ZnO crystals were estimated from the optimized structure. The obtained band gap was found 3.38 eV. The frequency-dependent complex dielectric function, absorption coefficient, refractive index, extinction coefficient, reflectivity and electron energy loss function spectra were also calculated and discussed.

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AMMAR Boukhari , Rabie AMARI , ELHADJ Benrezgua , Bahri DEGHFEL , ,(2022), Structural, electronic, optical and elastic properties of pure ZnO material using first-principles calculation,The first national Seminar on Green Chemistry and Natural Products (GCNP’22),University of Echahid Hamma Lakhdar, El-Oued

The present work studied the structural and luminescence properties of 10% Mn-doped ZnO thin film fabricated on glass substrate using sol–gel spin coating method. XRD result exhibited that the deposited thin film has a hexagonal wurtzite structure with a preferential orientation along the (0 0 2) c-axis orientation. The grain size, lattice constants, FWHM and strain of the film were calculated. To characterize the electronic and optical properties, UV-Vis spectra were used. The results indicate that the average transmittance is 55% in the visible range. The optical band gap energy was found to be 3.19 eV. The surface morphology showed a mixer of spheroid-like and rod-like nanoparticles (granules) randomly distributed. Photoluminescence (PL) spectra shows several emission bands, including one violet emission (defect) at 411 nm (~3.01 eV), two blue emissions at 438/475 nm (~2.83/~2.61 eV), and weak green emission at 525 nm (~2.36 eV).

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ELHADJ Benrezgua , Rabie AMARI , AMMAR Boukhari , Bahri DEGHFEL , ,(2022), Structural, electronic, morphological and luminescence properties of 10% Mn-Doped ZnO Thin Films,The first national Seminar on Green Chemistry and Natural Products (GCNP’22),University of Echahid Hamma Lakhdar, El-Oued

In this study, 10.8% Cu-doped ZnO thin film was deposited on glass substrate using sol–gel spin coating technique, in order to investigate the structural, optical and morphological properties. XRD result exhibited that the deposited thin film has a hexagonal wurtzite structure with a preferential orientation along the (0 0 2) c-axis orientation. The grain size, lattice constants, FWHM and strain of the film were calculated. To characterize the electronic and optical properties, UV-Vis spectra were used. The results indicate that the average transmittance is 80% in the visible range. The optical band gap energy was found to be 3.25 eV. The surface morphology showed a mixer of spheroid-like and rod-like nanoparticles (granules) randomly distributed.

Citation

Rabie AMARI , ELHADJ Benrezgua , AMMAR Boukhari , Bahri DEGHFEL , ,(2022), Structural, Optical and Morphological properties of 10.8% Cu-Doped ZnO Thin Films,The first national Seminar on Green Chemistry and Natural Products (GCNP’22),University of Echahid Hamma Lakhdar, El-Oued

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Rabie AMARI , Djamel ALLALI , Bahri DEGHFEL , ELHADJ Benrezgua , AMMAR Boukhari , ,(2022), Experimental and first principles study of structural, electronic and optical properties of Zn0.875Mn0.125O nanoparticles by co-precipitation method,10th International Conference on Materials Sciences And Technology, (MatScience-2022),khenchela, Algeria

Structural parameters, elastic constants and thermodynamic properties of the tetragonal ternary Ag-based oxides LiAgO and NaAgO are investigated theoretically for the first time using the plane-wave ultra-soft pseudopotential method [1] based on the density functional theory [2,3]. The optimized lattice parameters and atomic positions agree well with the available theoretical and experimental counterparts. Pressure dependence of the structural parameters is also explored. Pressure dependences of the single-crystal elastic constants Cij for LiAgO and NaAgO are explored. The elastic wave velocities propagating along the principal crystallographic directions are numerically estimated. The elastic anisotropy is estimated and further illustrated by 3D-direction-dependent of the Young’s modulus. A set of some macroscopic elastic moduli, including the bulk, Young’s and shear moduli, Poisson’s coefficient, average elastic wave velocities and Debye temperature, were calculated for polycrystalline LiAgO and NaAgO from the Cij via the Voigt-Reuss-Hill approximations [4–6]. Through the quasiharmonic Debye model [7], which takes into account the phonon effects, the temperature and pressure dependencies of the bulk modulus, unit cell volume, volume thermal expansion coefficient, Debye temperature and volume constant and pressure constant heat capacities of LiAgO and NaAgO are explored systematically in the ranges of 0–20 GPa and 0–1200 K.

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Djamel ALLALI , Amari Rabie , Bahri DEGHFEL , AMMAR Boukhari , ,(2022), Structural, elastic and thermodynamic properties of Ag-based oxides XAgO (X = Li and Na): An ab initio study,10th International Conference “Nanotechnologies and Nanomaterials” (NANO-2022),Lviv. Ukraine

Pure and Ni-doped ZnO nanoparticles (NPs) with concentration of Ni (12.5%) were successfully prepared by using co-precipitation method [1]. Among TM, nickel is very significant element which has a similar ionic radius as that of Zn. Literature studies show that Ni doping into ZnO matrix can enhance its various properties [2, 3]. The prepared samples in powder form were characterized by X-ray diffraction spectroscopy (XRD), Scanning Electron Microscopy (SEM), Ultraviolet–visible spectroscopy (UV-Vis), Photoluminescence (PL) and Fourier transform infrared spectroscopy (FTIR). The obtained results have been discussed and compared with those from other sources whatever possible.

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Rabie AMARI , ELHADJ Benrezgua , Djamel ALLALI , Bahri DEGHFEL , AMMAR Boukhari , ,(2022), Effect of high Ni Doping on the properties of ZnO Nanopowders,10th International Conference “Nanotechnologies and Nanomaterials” (NANO-2022),Lviv. Ukraine

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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AMMAR Boukhari , Bahri DEGHFEL , Abdelhafid MAHROUG , Rabie AMARI , Noureddine Selmi, Ahmad Azmin Mohamad, , (2021), Thickness Effect on the Properties of 4% Mn‐Doped ZnO Thin Films Grown by Sol‐Gel Spin Coating Deposition, Macromolecular Symposia, Vol:397, Issue:1, pages:2000235, Wiley Online Library

The current study investigates the effect of thickness on the structural, morphological, electronic, and optical properties of pure zinc oxide (ZnO) and 7% Mn-doped ZnO thin films, deposited by sol–gel spin coating method. All films exhibited a hexagonal wurtzite structure with a high preferential c-axis orientation. The surface morphology showed a good uniformity with cracks and wrinkles. The transmittance decreased with thickness. The bandgap energy was inversely varying with coating number. Photoluminescence spectra showed ultraviolet with strong and weak blue and weak green emission peaks. Density functional theory and Hubbard (DFT + U) method was then applied to study the structural, electronic, and optical properties of pure and 6.25% Mn-doped ZnO materials. A decrease in bandgap energy from pure to 6.25% Mn-doped ZnO material was shown using the DFT + U method. It also found that the Mn3d states were distributed far from Fermi level with a coexistence of both ionic and covalent nature bonds. A slight shift toward the lower energy was noticed for optical properties by Mn doping. The theoretical findings showed a similar behavior to those obtained by experiment.

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AMMAR Boukhari , Bahri DEGHFEL , Abdelhafid MAHROUG , Rabie AMARI , Noureddine Selmi, Soorathep Kheawhom, Ahmad Azmin Mohamad, , (2021), Thickness effect on the properties of Mn-doped ZnO thin films synthesis by sol-gel and comparison to first-principles calculations, Ceramics International, Vol:47, Issue:12, pages:17276-17285, Elsevier

Pure and copper-doped zinc oxide thin films at different contents x (Zn1-xCuxO; 0≤x ≤ 0.125) were synthesized by sol–gel spin coating process and investigated using various techniques. All samples exhibited a polycrystalline with wurtzite hexagonal phase, which wasn't altered and getting relaxed by Cu-doping. The grain size increased and changed its growth mode from c-axis growth to lateral one and the surface morphology was strongly influenced with increasing level of Cu doping. As x increased, the transparency of films was generally increased in the visible region and the band gap energy (Eg) presented a slight shrinking, indicating that the prepared films are suitable for use in opto-electronic applications. Ferromagnetic phase was adopted within density functional theory corrected by Hubbard method (DFT + LDA + U) to investigate the structural, electronic, magnetic and optical properties of pure and CZO structure. The closest Cu impurities gave the more stable configuration. Cu3d states were distributed around Fermi level inducing a major contribution to the magnetic moment. A mix of ionic and covalent bonding was remarked. DFT + LDA + U enhanced significantly the calculated Eg, which presented a narrowing with x. The imaginary part of the dielectric functions presented three main peaks and their static constants were slightly influenced by Cu doping.

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Bahri DEGHFEL , Abdelhafid MAHROUG , AMMAR Boukhari , Rabie AMARI , elhadj.benrezgua@univ-msila.dz, Muhamad Kamil Yaakob, Soorathep Kheawhom, Ahmad Azmin Mohamad, , (2021), Experimental and theoretical studies on structural, morphological, electronic, optical and magnetic properties of Zn1-xCuxO thin films (0≤ x≤ 0.125), Materials Science in Semiconductor Processing, Vol:134, Issue:, pages:106012, Elsevier

In this study,7% Mn-doped ZnO thin film was deposited on glass substrate using sol–gel spin coating method at 0,7 ZnO concentration, in order to investigate the structural, optical and morphological properties. XRD result exhibit that the deposited thin film has a hexagonal wurtzite structure with a preferential orientation along the (0 0 2) c-axis orientation. The grain size, lattice constants, FWHM and strain of the film were calculated. To characterize the electronic and optical properties, UV-Vis spectra were used. The results indicate that the average transmittance is 45.15% in the visible range. The optical band gap energy was found to be 2.577 eV. The surface morphology showed a good uniformity with few cracks and wrinkles.

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AMMAR Boukhari , Bahri DEGHFEL , Abdelhafid MAHROUG , Ahmad Azmin Mohammad, ,(2021), Structural, morphological and optical properties of Mn-doped ZnO thin films prepared by sol-gel spin coating method,1st international conference on materials and energies (IC- ME-21),Tamanghasset - Algeria

The structural, electronic and optical properties of Mn-doped ZnO thin films were studied using density functional theory (DFT) with Hubbard U method. Supercell model and substitutional method were employed to achieve the considered doping concentrations (x). Antiferromagnetic phase of Zn1−xMnxO (x = 0.125) structure was adopted at different geometry configurations. On the other hand, Zn1−xMnxO (x = 7, 10 and 12.5) thin films, with good uniformity, were fabricated using sol–gel spin coating technique. Both grain size and surface roughness were decreased with x, leading to the decrease of the average transmittance. Calculations revealed that Mn atoms tend to be close to each other around the O atom. Besides, Mn3d states were found to be rarely distributed around Fermi level. Furthermore, Mulliken analysis demonstrated the coexistence of both ionic and covalent bonding. Both materials presented a similar behavior for optical properties with a slight shift toward the lower energy by increasing x.

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Bahri DEGHFEL , , (2020), Effects of Mn doping on the structural, morphological, electronic and optical properties of ZnO thin films by sol-gel spin coating method: An experimental and DFT+U study, Physica B: Condensed Matter, Vol:577, Issue:15, pages:411766, ELSEVIER SCIENCE BV

This review aims to briefly outline the Hubbard-U scheme and to investigate the effect of its inclusion in standard Density Functional Theory on electronic, structural, and optical properties of ZnO wurtzite structure. To remedy the miscalculation of optimized lattice parameters determined by Local Density Approximation and Generalized Gradient Approximation approximations to experimental values, the effect of the implementation of Hubbard-U correction for only d state or for both d and p states was investigated for theoretical data collected from previous works. Further effort was devoted to studying the incorporation of Ud,Zn and Up,O to reproduce correct band gap, to exploring various regions composed of valence and conduction bands and their origin, and to revealing the nature of chemical bonding. This review also provides graphical and tabulated values extracted from earlier works on optical properties of ZnO wurtzite structure. It summarizes the effect of Ud,Zn and Up,O in several exchange–correlation functionals on the intensity and location of major peaks composed real and imaginary part of dielectric function as well as on the shift of main absorption peak and optical absorption edge. A comparison was made, wherever possible, between theoretical and experimental results.

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Bahri DEGHFEL , Kausar Harun, Nor Azmira Salleh, Muhamad Kamil Yaakob, Ahmad Azmin Mohamad, , (2020), DFT + U calculations for electronic, structural, and optical properties of ZnO wurtzite structure: A review, results in physics, Vol:16, Issue:, pages:102829, Elsevier B.V.

In this paper, a summary of existing experimental data published in the period of time between 1954 and 2015 is reviewed and presented in a tabular form for average L shell fluorescence yields taken from different sources. First, a critical examination of these data using the weighted average values is presented. Then, an interpolation using the well-known analytical function as a function of the atomic number Z is performed to deduce a new empirical average L shell fluorescence yields for elements in the range 23 ≤ Z ≤ 96. New theoretical calculations based on the configuration mixing Dirac-Fock method were performed for a few elements and are presented in this work. The results are compared with other theoretical, experimental and empirical values reported in the literature and a reasonable agreement has been obtained.

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Bahri DEGHFEL , Yassine Sahnoune, Abdelhalim Kahoul, , (2020), Updated database, new empirical and theoretical values of average L shell fluorescence yields of elements with 23≤Z≤96, Radiation Physics and Chemistry, Vol:166, Issue:, pages:108495, Elsevier Ltd

In this paper, we present a compilation of the measured photon-induced K/K intensity ratio values published in the literature from 1969 to 2018. In the considered period, we found about 1118 values (127 papers) for elements with . The analysis of the distribution of these experimental data values in function of the atomic number shows that almost all the elements from 11Na to 96Cm are covered, except some isolated cases with no data or less than two data values were found. It has been observed that the most exploited targets are in the region and and include an important number of data values. A critical examination of these data using weighted average values (K/K)w have been calculated for each element and recommended weighted values have been proposed.

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Bahri DEGHFEL , Salim Daoudi, Abdelhalim Kahoul, , (2020), Review of experimental photon-induced K/K intensity ratios, Atomic Data and Nuclear Data Tables, Vol:2, Issue:, pages:101308, Elsevier Inc

The structural, electronic and optical properties of Mn-doped ZnO thin films were studied using density functional theory (DFT) with Hubbard U method. Supercell model and substitutional method were employed to achieve the considered doping concentrations (x). Antiferromagnetic phase of Zn1−xMnxO (x = 0.125) structure was adopted at different geometry configurations. On the other hand, Zn1−xMnxO (x = 7, 10 and 12.5) thin films, with good uniformity, were fabricated using sol–gel spin coating technique. Both grain size and surface roughness were decreased with x, leading to the decrease of the average transmittance. Calculations revealed that Mn atoms tend to be close to each other around the O atom. Besides, Mn3d states were found to be rarely distributed around Fermi level. Furthermore, Mulliken analysis demonstrated the coexistence of both ionic and covalent bonding. Both materials presented a similar behavior for optical properties with a slight shift toward the lower energy by increasing x.

Citation

Rabie AMARI , Bahri DEGHFEL , Bahri DEGHFEL , , (2020), Effects of Mn doping on the structural, morphological, electronic and optical properties of ZnO thin films by sol-gel spin coating method: An experimental and DFT+U study, Physica B : Condensed Matter, Vol:577, Issue:19, pages:411766, Elsevier

The structural, electronic and optical properties of Mn-doped ZnO thin films were studied using density functional theory (DFT) with Hubbard U method. Supercell model and substitutional method were employed to achieve the considered doping concentrations (x). Antiferromagnetic phase of Zn1−xMnxO (x = 0.125) structure was adopted at different geometry configurations. On the other hand, Zn1−xMnxO (x = 7, 10 and 12.5) thin films, with good uniformity, were fabricated using sol–gel spin coating technique. Both grain size and surface roughness were decreased with x, leading to the decrease of the average transmittance. Calculations revealed that Mn atoms tend to be close to each other around the O atom. Besides, Mn3d states were found to be rarely distributed around Fermi level. Furthermore, Mulliken analysis demonstrated the coexistence of both ionic and covalent bonding. Both materials presented a similar behavior for optical properties with a slight shift toward the lower energy by increasing x.

Citation

Rabie AMARI , Bahri DEGHFEL , Bahri DEGHFEL , , (2020), Effects of Mn doping on the structural, morphological, electronic and optical properties of ZnO thin films by sol-gel spin coating method: An experimental and DFT+U study, Physica B : Condensed Matter, Vol:577, Issue:19, pages:411766, Elsevier

The structural, electronic and optical properties of Mn-doped ZnO thin films were studied using density functional theory (DFT) with Hubbard U method. Supercell model and substitutional method were employed to achieve the considered doping concentrations (x). Antiferromagnetic phase of Zn1−xMnxO (x = 0.125) structure was adopted at different geometry configurations. On the other hand, Zn1−xMnxO (x = 7, 10 and 12.5) thin films, with good uniformity, were fabricated using sol–gel spin coating technique. Both grain size and surface roughness were decreased with x, leading to the decrease of the average transmittance. Calculations revealed that Mn atoms tend to be close to each other around the O atom. Besides, Mn3d states were found to be rarely distributed around Fermi level. Furthermore, Mulliken analysis demonstrated the coexistence of both ionic and covalent bonding. Both materials presented a similar behavior for optical properties with a slight shift toward the lower energy by increasing x.

Citation

Rabie AMARI , Bahri DEGHFEL , Abdelhafid MAHROUG , AMMAR Boukhari , Ahmad Azmin Mohamad, Noureddine Selmi, , (2020), Effects of Mn doping on the structural, morphological, electronic and optical properties of ZnO thin films by sol-gel spin coating method: An experimental and DFT+ U study, Physica B: Condensed Matter, Vol:577, Issue:15, pages:411766, North-Holland

ZnO and ZnCoO thin films have been deposited onto glass substrates by sol–gel spin coating method. Zinc acetate dihydrate, cobalt acetate tetrahydrate, Isopropanol and monoethanolamine (MEA) were used as a precursor, doping source, solvent and stabilizer respectively. The molar ratio of MEA to ions metal was maintained at 1.0 and a concentration of metal ions is 0.6 mol.L-1 . The XRD results showed that both films crystallized under hexagonal wurtzite structure and presented a preferential orientation along the c-axis with the maximum crystallite size was found is 25nm. Atomic force microscope (AFM) images revealed the good uniformity for both films, an increase of surface roughness is observed with doping. The average transmittance in the visible region was higher than 85% for both films and the optical band gap of Zinc oxide films decreased with Co doping. Photoluminescence of the films showed a ultraviolet (UV) and defect related visible emissions like violet, blue and green, and indicated that cobalt doping resulted in red shifting of UV emission and the reduction in the UV and visible emissions intensity. Ours thin films shows the best photocurrent properties.

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Abdelhafid MAHROUG , Bahri DEGHFEL , ,(2019), Studies on structural, surface morphological, optical, luminescence and uv photodetection properties of sol gel oxides thin films,ICAMS 2018 – 7th International Conference on Advanced Materials and Systems,Romania

In this work, we have studied the influence of Mn doping on the structural, morphological, optical and photoluminescence (PL) properties of ZnO thin films. ZnO thin films with different concentrations of Manganese (0, 2 and 4 mol.%) were prepared by the sol–gel spin coating process and synthesized on glass substrates. By using an X-ray diffractometer (XRD) (Bruker 8 Advance) with Cu-kα radiation having a wavelength λ=1.5406 A°, the structural properties of the films were characterised. To evaluate the band gap, the optical transmission spectra were measured by an ultraviolet-visible (UV-vis) spectrophotometer (UV-3101 PC-Shimadzu) in the spectral range 300-800 nm. Photoluminescence (PL) measurements were recorded using a spectrofluorimeter (Perkin Elmer LS 50B) with the excitation wavelength of 325 nm.

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Rabie AMARI , Abdelhafid MAHROUG , Bahri DEGHFEL , ,(2018), Effect of Mn Doping on the Structural and Optical Properties of ZnO thin Films,International Conference on Materials Science (ICMS2018),Ferhat Abbas Setif 1-Algeria

Magnesuim doped Zinc oxide thin films were prepared by sol-gel spin coating method

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Abdelhafid MAHROUG , Amari Rabie , Boukhari Ammar , Bahri DEGHFEL , elhadj.benrezgua@univ-msila.dz, ,(2018), Deposition and Characterization of Mg doped nanostructured thin films,International Conference on Materials Science 2018 (ICMS2018),Sétif, Algeria

Zn0.875Mn0.125O thin films are fabricated by a simple sol-gel spin-coating technique on glass substrates using zinc acetate dehydrate [Zn(CH3COO)2·2H2O] and manganese acetate tetrahydrate [Mn(CH3COO)24H2O]as a starting material and doping source. Isopropanol and monoethanolamine (MEA) were used as solvent and stabilizer, respectively. X-ray diffraction, ultraviolet-visible spectroscopy and photoluminescence spectroscopy are employed to investigate the effect of Mn doping on the structural, electronic and optical properties of ZnO thin films. The obtained results are compared with those using first-principles calculation based on density functional theory (DFT) with local density approximation (LDA) plus Hubbard U (DFT–LDA+U) method. This latter represents the theoretical framework to deal with strongly correlated materials to predicted successfully the electronic properties of such materials.

Citation

Bahri DEGHFEL , ,(2018), Experimental and first principles study of structural, electronic and optical properties of Zn0.875Mn0.125O thin film,ICAMS 2018 – 7th International Conference on Advanced Materials and Systems,Romania

In this study, Manganese-doped Zinc oxide (ZnO) nanostructured thin films with different Mn doping concentrations (0, 1, 3, 5 and 7 mol.%) were synthesized on glass substrates by the sol–gel spin coating technique. The concentration of metal ions was fixed at 0.6 mol·L–1. Structural, surface morphological, optical and luminescence properties of the films were investigated by XRD, AFM, UV-Vis spectrometry and PL spectroscopy techniques. The XRD results showed that the films had hexagonal wurtzite structure and exhibited preferred orientation along the c-axis. Crystallite size, lattice parameters, strain and residual stress were influenced by Mn doping, where average crystallite size decreased from 45 to 10 nm with doping concentration. Atomic force microscope (AFM) images revealed the good uniformity for all the films, and reduction of grain size and surface roughness is observed with the increase of doping concentration. The average transmittance in the visible region was higher than 80% for all the films. Unlike the Urbach energy, the optical band gap of Zinc oxide films decreased with Manganese doping. The origin of ultraviolet, violet, blue and green emissions observed from photoluminescence spectra, and the effect of Mn doping on the luminescence properties and defects concentration were discussed in details. It is worth noting that the fabricated Zinc oxide (ZnO) thin films, which presented good properties, can be used for potential applications in optoelectronic devices.

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Abdelhafid MAHROUG , Amari Rabie , Boukhari Ammar , Bahri DEGHFEL , , (2018), Synthesis, Structural, Morphological, Electronic, Optical and Luminescence Properties of Pure and Manganese-Doped Zinc Oxide Nanostructured Thin Films: Effect of Doping, Journal of Nanoelectronics and Optoelectronics, Vol:13, Issue:5, pages:732, American Scientific Publishers

In this study, Manganese-doped Zinc oxide (ZnO) nanostructured thin films with different Mn doping concentrations (0, 1, 3, 5 and 7 mol.%) were synthesized on glass substrates by the sol–gel spin coating technique. The concentration of metal ions was fixed at 0.6 mol·L–1. Structural, surface morphological, optical and luminescence properties of the films were investigated by XRD, AFM, UV-Vis spectrometry and PL spectroscopy techniques. The XRD results showed that the films had hexagonal wurtzite structure and exhibited preferred orientation along the c-axis. Crystallite size, lattice parameters, strain and residual stress were influenced by Mn doping, where average crystallite size decreased from 45 to 10 nm with doping concentration. Atomic force microscope (AFM) images revealed the good uniformity for all the films, and reduction of grain size and surface roughness is observed with the increase of doping concentration. The average transmittance in the visible region was higher than 80% for all the films. Unlike the Urbach energy, the optical band gap of Zinc oxide films decreased with Manganese doping. The origin of ultraviolet, violet, blue and green emissions observed from photoluminescence spectra, and the effect of Mn doping on the luminescence properties and defects concentration were discussed in details. It is worth noting that the fabricated Zinc oxide (ZnO) thin films, which presented good properties, can be used for potential applications in optoelectronic devices.

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Abdelhafid MAHROUG , Rabie AMARI , AMMAR Boukhari , Bahri DEGHFEL , L Guerbous, Nourddine Selmi, , (2018), Synthesis, Structural, Morphological, Electronic, Optical and Luminescence Properties of Pure and Manganese-Doped Zinc Oxide Nanostructured Thin Films: Effect of Doping, Journal of Nanoelectronics and Optoelectronics, Vol:13, Issue:5, pages:732-742, American Scientific Publishers

Transparent zinc oxide (ZnO) thin films are fabricated by a simple sol-gel spin-coating technique on glass substrates with different solution concentrations (0.3–1.2 M) using zinc acetate dehydrate [Zn(CH3COO)2·2H2O] as precursor and isopropanol and monoethanolamine (MEA) as solvent and stabilizer, respectively. The molar ratio of zinc acetate dehydrate to MEA is 1.0. X-ray diffraction, ultraviolet-visible spectroscopy and photoluminescence spectroscopy are employed to investigate the effect of solution concentration on the structural and optical properties of the ZnO thin films. The obtained results of all thin films are discussed in detail and are compared with other experimental data.

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AMMAR Boukhari , Abdelhafid MAHROUG , AMMAR Boukhari , Bahri DEGHFEL , NOURREDINE SELMI, , (2018), Structural, optical and luminescence properties of ZnO thin films prepared by sol-gel spin-coating method: effect of precursor concentration, Chinese Physics Letters, Vol:35, Issue:, pages:016801, IOP Publishing

Zn0.875Mn0.125O thin films are fabricated by a simple sol-gel spin-coating technique on glass substrates using zinc acetate dehydrate [Zn(CH3COO)2·2H2O] and manganese acetate tetrahydrate [Mn(CH3COO)24H2O]as a starting material and doping source. Isopropanol and monoethanolamine (MEA) were used as solvent and stabilizer, respectively. X-ray diffraction, ultraviolet-visible spectroscopy and photoluminescence spectroscopy are employed to investigate the effect of Mn doping on the structural, electronic and optical properties of ZnO thin films. The obtained results are compared with those using first-principles calculation based on density functional theory (DFT) with local density approximation (LDA) plus Hubbard U (DFT–LDA+U) method. This latter represents the theoretical framework to deal with strongly correlated materials to predicted successfully the electronic properties of such materials.

Citation

Bahri DEGHFEL , Abdelhafid MAHROUG , Rabie AMARI , AMMAR Boukhari , A. BENTABET, ,(2018), Experimental and first principles study of structural, electronic and optical properties of Zn0.875Mn0.125O thin film,ICAMS 2018 – 7th International Conference on Advanced Materials and Systems,Bucharest, ROMANIA

The structural, electronic, elastic and optical properties of pure and Mn-doped ZnO with a wurtzite structure were calculated by using first-principles calculation based on density functional theory (DFT) with local density approximation (LDA) [1] plus Hubbard U (DFT–LDA+U) method [2]. This latter represents the theoretical framework to deal with strongly correlated materials to predicted successfully the electronic properties of such materials. The wurtzite ZnO system is then doped with Mn at different sites. The obtained results were discussed and compared with earlier works.

Citation

Bahri DEGHFEL , AMMAR Boukhari , Rabie AMARI , Abdelhafid MAHROUG , A. Bentabet, ,(2017), First principles LDA+U study of structural, electronic, elastic and optical properties of Mn doped wurtzite ZnO.,Nanotechnology and nanomaterials» (NANO-2017),Ukraine - Chernivtsi