Lahcen Nkhaili

Lahcen Nkhaili
Cadi Ayyad University | UCAM · Department of Physics

Professor
Faculty of Sciences Semlalia, Cadi Ayyad University

About

63
Publications
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534
Citations

Publications

Publications (63)
Article
Full-text available
In this work, we present and report on the evolution of thermoelectric properties altered through changes in the energy barrier height in thermally evaporated mixed-phase copper sulfide thin films. The physical interpretations depend on the conception of degenerate energy levels near the top of the valence band. The energy barrier at grain boundari...
Chapter
This research has examined how the rotational speed affects the structural, morphological, and optical characteristics of the compound copper iron cobalt tin sulfide Cu2Fe0.5Co0.5SnS4 (CFCTS). CFCTS thin films were applied to a glass substrate using the straightforward spin coating method, with varying rotational speeds, and without the need for a...
Article
Full-text available
In this paper, we present the effects of annealing in a vacuum on the structural, electrical, thermoelectric, optical and properties of a glass/ITO (40 nm)/Cu (5 nm)/Ni (10 nm)/ITO (40 nm) multilayer prepared on glass substrates at room temperature using the Radio Frequency (RF) sputtering technique. The effect of annealing in a vacuum is investiga...
Article
Nickel oxide material is considered an interesting class of p-transparent-conductive oxides for various fields of application. Improving the conductivity of these materials while retaining a high level of optical transmittance is considered a real challenge for their functional use. In the present work, a detailed study of the effect of cobalt inco...
Article
Full-text available
Thin films of tungsten oxide were deposited on glass substrates by the radio frequency (RF) reactive sputtering from a high purity tungsten metal target (99.9%) with a diameter of 10 cm. The reactive sputtering was carried out in an argon-oxygen gas mixture containing 20% of O 2 and 80% of Ar. The used RF power is 200 W while fixing the deposition...
Article
In this work, copper oxide nanowires (CuO NWs) were synthesized on fluorine-doped tin oxide/glass substrates using the electrochemical technique followed by thermal oxidation in air atmosphere. In particular, we study the effect of the annealing time (4, 6, 8, 10 and 12 h) on CuO NWs properties. It was proved that the population density of CuO NWs...
Article
The effect of annealing temperature and atmosphere on structural, optical and electrical properties of indium tin oxide (ITO) thin films with a nanoscale thickness, grown on glass substrates by radio frequency sputtering, was investigated. X-ray diffraction, grazing incidence X-ray reflectivity, scanning electron microscopy, energy dispersive X-ray...
Article
In this study, we focus on the effect of the radio frequency (RF) sputtering power on the structural, optical and electrical properties of NiO thin films, deposited on glass substrates in the O2/Ar atmosphere. It was observed that by increasing the RF power from 50 to 300 W, the crystallite size increases from 5.5 to 8.28 nm then decreases for 350...
Article
Thin films of vanadium oxide were deposited on glass substrates by the radio frequency reactive sputtering from a high purity metallic vanadium target (99.7%) with a diameter of 10 cm. The reactive sputtering was carried out in an argon-oxygen gas mixture containing 10% of O2 and 90% of Ar. The films were deposited at different RF powers (150 W, 20...
Article
In this work, we study the effect of vacuum annealing and position of metal Cu on structural, optical, electrical and thermoelectrical properties of ITO/Cu/ITO multilayers prepared on glass substrates, at room temperature by Radio Frequency (RF) sputtering. ITO (80 nm)/Cu(5 nm)/ITO (80 nm) ICI(a) and ITO (150 nm)/Cu(5 nm)/ITO (10 nm) ICI(b) multila...
Article
The copper cobalt tin sulfide Cu2CoSnS4 (CCTS) thin films are among the most promising materials for power conversion. We carried out a study on copper-cobalt tin sulfide thin films deposited via a simple route using the sol-gel spin-coating method. X-ray diffraction, Raman spectroscopy, scanning electron microscopy, energy dispersive analysis, and...
Article
Different phases of copper sulfide were synthesized by the Flash Evaporation method, followed by annealing at various temperatures. Pure and mixed crystal structures of the covellite, digenite and djurleite phases were identified by the X-ray diffraction patternsand Raman spectroscopy. Scanning Electron Microscopy revealed the effect of annealing o...
Article
The use of natural dyes as sensitizers in organic solar cells is getting more interest due to its green nature, nontoxicity, low cost and ecofriendly materials. In this paper, two antraquinone/zinc oxide-based dye-sensitized solar cells (DSSCs) were prepared by a simple and low cost method. The anthraquinone was extracted from Aloe-vera plant and w...
Article
In this report, the Multifunctional Quinary Cu2Ni0.50Co0.50SnS4 synthesized by an inexpensive and easy-to-use using spin-coating technique on glass substrates. XRD spectra of Cu2Ni0.50Co0.50SnS4 annealing at 300°C demonstrated the structure similar to that of Cu2NiSnS4 and Cu2CoSnS4 for 60 min and 90 min, but Raman scattering confirmed the structur...
Article
In this paper, Nickel oxide (NiO) thin films were synthesized by the reactive radio frequency sputtering. NiO thin films were annealed at different temperatures (350, 400, 450 and 500 °C). Structural characterizations were performed using X-Ray Diffraction, Scanning Electron Microscopy (SEM), Raman spectroscopy, Infrared spectroscopy. Ultraviolet–v...
Article
Full-text available
We have studied the structural, optical, electrical and thermoelectric properties of radio frequency (RF)-sputtered indium tin oxide (ITO) thin films, synthesized at room temperature on glass substrates. A target, containing 90 wt% of In2O3 and 10 wt% of SnO2, was used. The structure of ITO thin films was analyzed by x-ray diffraction (XRD) and x-r...
Article
The operation of a thermoelectric generator (TEG) is a complicated multidisciplinary subject since it involves the phenomenon of electrical and thermal transport in a dependent manner. This paper focuses on determining the optimum electrical load resistance to be supplied by a given TEG system. Thermal exchanges and electrical transport were evalua...
Article
Full-text available
Indium tin oxide (ITO) films are widely used as transparent conducting electrodes in solar cells, gas sensors, and car windows because of their high electrical conductivity and good optical transparency in the visible region. In this work, ITO thin films were prepared by cathodic radio-frequency (RF) sputtering using an ITO target with 90% In2O3 an...
Article
Full-text available
In this study, dense zinc oxide nanowires were electrochemically synthesized on sputtered zinc oxide buffer layers substrates using a solution of zinc chloride as a precursor. The control of nanowires density was studied. X-Ray Diffraction patterns revealed the formation of pure wurtzite zinc oxide structure. The mechanism of the formation of zinc...
Article
The control of structural properties of pure and cobalt doped cuprous oxide films is an available way to optimize the conditions of their deposition for better performance in solar cells and electrodes for photoelectrochemical (PEC) hydrogen production. In this study, series of Cu2O:Co thin films were synthesized using the electrodeposition method...
Article
In this paper, a ZnO/CdS/CuO:Co solar cell was prepared on a glass/indium oxide (ITO) substrate. First, we use RF-sputtering to deposit the window (ZnO) layer by optimizing the oxygen pressure while keeping the RF power at 200 W. Fourier transform infrared and X-ray reflectometry spectra were carried out, and it is found that 30% of O2 is the optim...
Article
Full-text available
Copper oxide nanowires (CuO NWs) were synthesized by thermally oxidizing copper foils at various heating rates. It has been shown that both monoclinic CuO and cubic Cu2O phases were grown on the copper surface with NW diameters of almost 200 nm for all samples. While NWs were shown to be dense for low heating rates, they end up being broken for qui...
Article
Organic solar cells are considered to be the promising solar technology for the coming year because of their ease of manufacture. In the present study, the Aloe Latex as yellow orange Solid (ALS) collected from the leaves of Aloe Vera plant (aloe barbadensis miller) was used as a natural and cheap sensitizer thin film. The ALS powder was analysed u...
Article
Full-text available
In this work, a new structure ITO/n-ZnO/n-CdS/p-CuO:Co/Ag for solar cell was prepared on a glass/ITO substrate. The RF sputtering was used to deposit the window layer (n-ZnO) at different time periods in order to reach various thickness of this film. The n-CdS thin films were synthesized by sol-gel technique to reduce the energy bands. The buffer l...
Article
Full-text available
Zinc oxide (ZnO) and aluminum doped zinc oxide (AZO) nanoparticles were synthesized by a typical sol-gel method. The effect of the doping and the annealing temperatures were studied. The dopant percentage of 4% was fixed. XRD patterns showed that ZnO and Al doped ZnO nanoparticles exhibit good crystallization. The crystallite size was shown to decr...
Article
Thermoelectric semiconductors have attracted the attention of researchers due to their potential uses in energy conversion and cooling applications. These materials exhibit a potential difference when subjected to a temperature gradient (Seebeck effect). In this work, we report on the design of a simple apparatus to measure the Seebeck coefficient...
Article
Full-text available
Over the past few years, Cu-based materials have been intensively studied focusing on their structural and thermoelectric properties. In this work, copper sulphide powders were synthesized by the sol-gel method. The chemical composition and the morphological properties of the obtained samples were analyzed by X-ray diffraction, differential thermal...
Article
This study describes a facile spin-coating deposition technique for cadmium sulfide thin film. The structural analysis revealed the formation of a pure hexagonal cadmium sulfide phase. The lattice constant, the crystallite size, dislocation density and micro strain were calculated. Energy dispersive x-ray analysis confirmed that these as-prepared C...
Article
Full-text available
A series of solar cells were fabricated using a nanocomposite based on sexithiophène derivatives and nanostructured zinc oxide as blend donor/acceptor active layer. The polymer (POT) and the oligothiophene were synthesized by chemical oxidization. The powders of nanostructured ZnO were prepared by a onepot solution route at ambient conditions. The...
Article
Copper sulfide nano-particles were prepared by the sol-gel method followed by a thermal treatment at 200 °C. Structural and optical properties were analyzed using X-Ray Diffraction, Scanning Electron Microscopy, Fourier Transform Infrared and UltravioleteVisible spectroscopies. It was found that the obtained compound is a mixed phase and contains r...
Conference Paper
Full-text available
Organolead-halide-perovskite-based solar cells have recently received significant attention due to their excellent photovoltaic performances and low cost. The general formula of the perovskite absorber is ABX3, where A stands for (R-NH3) and B is a metal (Pb or Sn) and X is a halide (Cl, I, or Br). In this work we report on the fabrication of FTO/...
Article
Full-text available
Copper zinc tin sulfide thin films were successfully prepared by spin coating on Molybdenum coated glass substrates. The as-deposited thin films were annealed at 400°C, 450°C and 500 °C in an Argon atmosphere for 1 hour. X-ray diffraction studies revealed that the thin films present the kësterite phase. The band gap decreased with increasing anneal...
Article
Full-text available
Cu2ZnSnS4 (CZTS) thin films were synthesized by spin coating on soda lime glass (SLG) substrates and SLG substrates covered by molybdenum using the sol-gel method, without a further sulfurization step. The thin films were subsequently annealed under different temperature ranging from 350°C to 550°C for 1h in a nitrogen N2 gas atmosphere. The effect...
Article
Full-text available
Mixed halide perovskites CH3NH3Pb(I1−xBrx)3 thin films were successfully fabricated by spin coating using a precursor solution obtained by reacting a (1:1) molar ratio of methyl-ammonium iodide (CH3NH3I) and lead bromide (PbBr2). The films obtained by this one step process were used to fabricate a solar cell using an aluminum-doped Zinc oxide (Al–Z...
Article
Full-text available
Mixed halide perovskites CH 3 NH 3 Pb(I 1 À x Br x) 3 thin films were successfully fabricated by spin coating using a precursor solution obtained by reacting a (1:1) molar ratio of methyl-ammonium iodide (CH 3 NH 3 I) and lead bromide (PbBr 2). The films obtained by this one step process were used to fabricate a solar cell using an aluminum-doped Z...
Article
Full-text available
The hybrid conducting polymers/inorganic semiconductor is an important alternative for low-cost solar cells. Poly(o-toluidine) (POT) thin films were fabricated by spin coating technique on ZnO seed layer and on ZnO nanowires from a solution of poly(o-toluidine) in chloroform. The optical, the structural and morphological properties of the as-deposi...
Article
Full-text available
In this paper, n-Zinc oxide/p-copper oxide heterojunctions were fabricated by RF-sputtering on indium tin oxide-covered glass substrates. The structural and optical properties of the copper oxide and zinc oxide films were analyzed by X-ray diffraction, Fourier transform infrared, scanning electronic microscopy and ultraviolet-visible spectroscopy....
Conference Paper
Full-text available
Recently, the quaternary semiconducting compound Copper Zinc Tin Sulfide (CZTS) has received increasing attention for applications in thin film solar cells because it offers optical and electronic properties that are comparable to those of the I-II-VI 2 materials (CIGS for example) while being composed of abundant and non-toxic elements. In this wo...
Conference Paper
Full-text available
In this work n-ZnO/p-CuO heterojunctions were fabricated by respectively depositing ZnO by spin coating and CuO by RF-sputtering on ITO covered glass substrates. The structural and optical properties of the p-CuO and n-ZnO films were investigated by X-ray diffraction and UV-VIS spectroscopy. The electrical junction properties were characterized by...
Article
Full-text available
ZnO thin films were deposited by reactive cathodic radio-frequency (RF) sputtering from a pure Zn target in a gas mixture of 30% O2 and 70% Ar and at different RF powers. The structural properties of the as-deposited thin films were studied by X-ray diffraction (XRD). The optical properties (especially the refractive index, absorption coefficient a...
Article
Full-text available
Amorphous silicon carbide thin films have been deposited by radiofrequency cosputtering. These films were deposited from a composite target consisting of silicon fragments regularly distributed on the surface of a pure graphite disc for different relative silicon-to-carbon area ratio values (15%, 25%, 35%, 50%, and 65%), with a radiofrequency power...
Article
Full-text available
In this work, kësterite thin films were deposited on soda lime glass substrates by spin coating from a sol-gel precursor without further sulfurization. Zinc oxide films were prepared by an electrochemical technique, and these films were then used to fabricate kësterite/zinc oxide heterojunc-tions. X-ray diffraction analysis showed that the as-depos...

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