Poster Session III

 ef°

Author

Institution

Title

Abstract

E-poster

PP41

M. Al-hattab,a  K. Rahmani,a,+   L. Moudou,a  M. Khenfouch b

Department of Physics, Faculty of Polydisciplinary (ERPTM), B.P 503, 23000, Beni Mellal, Morocco.

b Africa Graphene Center..

Design of experiments for modeling and optimization of nickel electrodeposition process

In this paper, we have calculated the optical conductivity of the ε-GaSe layer. The calculation is based on the DFT method using the CASTEP code. This study is carried out in a field which extends energetically from 10 meV to 35eV, and they were measured for a polarization // and with the axis c. The position of the main peaks is different for these two cases, which shows an anisotropic optical behavior of this material, because of the symmetry of a single layer, rather by the symmetry resulting from the stacking of the layers.

PP41

PP42

M. Achehboune,a,b,+  M. Khnefouch,b,c I. Boukhoubza,a,b B M. Mothudi,c, I. Zorkani,a A. Jorioa

a Sidi Mohammed Ben Abdellah University, Faculty of Sciences Dhar el Mahraz, Laboratory of Solid state Physics, Group of Nanomaterials and Renewable Energies, PO Box 1796 Atlas Fez 30 000, Morocco.

b Africa Graphene Center, Physics department, Eureka building, College of Science, Engineering and Technology, Science Campus, University of South Africa, Cnr Christiaan de Wet & Pioneer Avenue Florida 1709, Johannesburg, South Africa.

cDepartment of Physics, University of South Africa, Private Bag X90, Florida, 1710, South Africa.

 

Study on the effect Er dopant on the optoelectronic properties of nanostructured ZnO

 

Undoped and Rare earth (Er) doped ZnO nanorods was studied with an aim to enhance and control its multifunctional properties for various optoelectronic properties. After synthesizing well-defined Er doped ZnO nanorods by hydrothermal method, evaluation of structural and optical characterstics of synthesised ZnO nanorods was performed. The results obtained by XRD spectrum indicated the presence of hexagonal  (wurtzite)  structure  for  both  pure  and  Er  doped  ZnO  NRs  with  additional  cubic phase of Er2O3 that appeared in the doped sample. The size and lattice strain of particles have increased after doping with Erbium. The SEM images showed that the samples have flower-like ZnO nanorods. The optical investigations showed a strong absorbance in UV region. The optical band gap energy (Eg) of ZnO nanostructures has been determined from the analysis of UV absorbance spectra and found to be decreased with increasing Er doping concentration.

 

PP42

For reasons of confidentiality the poster link has been intensively disabled

PP43

I. Boukhoubzaa,d,+, M. Khenfouchb,d, M. Achehbounea,c, L. Leontiec, A. Carlescuc, C. Dorofteic, B. M. Mothudib, I. Zorkania and A. Jorioa

a Sidi Mohammed Ben Abdellah University, Faculty of Sciences Dhar el Mahraz, Laboratory of Solid state Physics, Group of Nanomaterials and Renewable Energies, PO Box 1796 Atlas Fez 30 000, Morocco

b University of South Africa, Department of Physics, Private Bag X90, Florida, 1710, South Africa

cAlexandru Ioan Cuza University of Iasi, Faculty of Physics, Bulevardul Carol I, nr. 11, Iasi 700506, Romania

d Africa Graphene Center, Department of Physics, College of Science, Engineering and Technology, Science Campus, University of South Africa, Cnr Christiaan de Wet & Pioneer Avenue Florida 1709, Johannesburg, South Africa.

 

Graphene oxide coated flower-shaped ZnO NRs for UV detection application

 

The influence of graphene oxide coating on optical and photoluminescence properties of zinc oxide nanorods (ZnO NRs) has been investigated. The structural, morphological, optical and luminescence properties of the films were investigated . As revealed by XRD analysis, composites display a hexagonal wurtzite type structure with a (101) preferred grain orientation. The average crystallite sizes decreases from 45 to 40 nm after GO coating. The SEM study confirms successful coating of GO layers on flower-like ZnO nanostructures. The Raman analyses validated the hybridization of nanocomposite and the strong interaction between ZnO NRs and GO. The band gap of the ZnO NRs: GO nanocomposite is lower (2.95 eV) compared to that of ZnO NRs (3.11 eV), as determined from the analysis of UV absorbance spectra. The ZnO NRs:GO nanocomposite exhibits a broad PL band, from ~450 nm to ~750 nm, with a nearly white-light integrated emission and a chromaticity coordinate of (0.25, 0.34). Gaussian deconvoluted broad PL band exhibits three distinct sub-bands, associated with radiative recombinations in ZnO and GO.

 

PP43

 

PP44

L. Moudoua+, M. AL-Hattaba, K. Rahmania, M. Khenfouchb

 

aFaculté Polydisciplinaire-Béni Mellal, ERPTM, Université Sultan Moulay Slimane, BP 592, 23000 -Morocco

b Africa Graphene Center

Effect of conduction band non-parabolicity on the intersubband transitions in GaInN/AlInN quantum well heterostructures

Quantum well heterostructures are the basic constituents of most optoelectronic devices.  The main interest of this type of structure is the confinement of the carriers in the quantum well according to the direction of growth, which gives a discretization of the energy levels accessible to the  carriers of charge. The bursting between these levels will determine the different transitions energy. The energy and the number of the confined levels depend on various parameters defining the structure namely: the thickness of the well, the thickness of the barrier, the energy of gap, the doping and the offset: the energy shift between the different bands of the well and the barrier. Under certain conditions, the confinement of electrons and holes in the same region of space leads to very significant quantum and optical efficiencies. The resulting devices (Led’s, LD, QCL, QWIPs, …) are used in various fields of application (Medicine, Telecom, Security, Military, Astronomy …)

We theoretically studied quantum confinement in the unstressed GaN / AlInN heterostructure, working within the framework of the envelope function model by adopting the approximation of the parabolic bands [1]. We used a finite difference numerical method to determine the energies and envelope functions of the hétérostructure [2,3].  The objective is the determination of the geometries whose intersubband transitions energies would allow the design of unipolar optoelectronic devices for applications in the terahertzic domain  (0.4—41.33 meV)  on the one hand and on the other hand in the field of optical fiber telecommunications (800—933 meV) [4].

Our results show that it is necessary to consider geometries generating 4 confined levels to reach wavelengths for telecommunications applications. Indeed, the transition E14 allows us to have wavelengths λ = 1.44-1.54 μm for well widths Lw = 20-45 Å and the barrier Lb = 60 Å. And the transition E34 allows us to have a transitions of frequency ʋ = 9.86 THz corresponding to the terahertzic radiations for the critical geometry 6 / 2.5 / 6 nm. This geometry would thus satisfy the two desired domains.

 

PP44

PP46

C. N. Abouloula a, I. Bouknaitirb, A. Oueriagli a, L. C. Costa c, M. E. Achour b,+

aNanomaterials for Energy and Environment Laboratory (N2EL), Facultyof Sciences, Semlalia, P.O Box. 2390, 40000 Marrakesh, Morocco

bLASTID Laboratory, Physics Department, Faculty of Sciences, Ibn Tofail University, B.P:133, 14000, Kenitra, Morocco

cI3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal

 

Optical and electrical properties of some skin of tomatoes, potatoes and peppers

 

Vegetable skins have many properties that can be used to produce new materials. In this study, our work looks to exploit the bio-resources in the industry. This study reports the optical property of fresh and dried skin of tomato, potato and pepper. The study was carried out in the frequency range between 100 Hz and 1 MHz, at the temperature range from 300 K to 400 K. The optical transmittance measurements were performed using a Shimadzu UV-PC spectrophotometer in the 200–2800 nm range.

 

PP46

PP47

A. Taoufik a, R. Hsissoub, S. S. Teixeirac, M. El Hasnaouia.+, M. E. Achoura, L. C. Costac, A. Elharfib

1LASTID Laboratory, Department of Physics, Sciences Faculty, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco

2 Laboratory of Agricultural Resources, Polymers and Process Engineering (LARPPE), Department of Chemistry, Faculty of Sciences, Ibn Tofail University, BP 133, 14000 Kenitra,Morocco

3 I3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal

 

Investigating the electrical transport mechanisms of natural phosphate/ pentafunctional epoxy resin composites

 

An investigation on electrical transport mechanisms of composites materials based on novel pentafunctional epoxy resin matrix reinforced with different concentrations of natural phosphate (NPh) particles has been presented. The electrical properties were measured in the frequency domain 100 Hz – 1 MHz and temperature range from 200 to 400 K. The frequency-dependence of the electrical conductivity is analyzed using the Jonscher power  law and the Nyquist representation of the electrical modulus spectra is modeled using the Cole-Cole model. The calculated relaxation parameters show that, with the increasing of the NPh particle concentrations, the composite becomes more heterogeneous. Furthermore, the relaxation time and the electrical resistivity were analyzed using the Arrhenius equation.

 

PP47

PP48

M. Benlattar*1, M. Mazroui1, E. M. Oualim2

a Hassan II University, Faculty of Sciences Ben M’sik, Department of Physics, 7955 Sidi Othman Casablanca.

bHassan 1er University, High School of Technology of Berrechid, BP 218 Berrechid – Morocco

Estimating of dew yield from the calcite dew condenser

 

With the possibility of harvesting the coldness of the atmosphere as an inexhaustible thermodynamic resource, passive radiative cooling technology is used for many applications such as refrigeration, renewable energy harvesting and dew condensation. However, in this study, we focus on dew harvesting as a new-researched area. This paper presents an energy balance modelling approach to predict the nightly water yield from meteorological data in semi-arid region (Mirleft, Southern Morocco). The proposed approach provides a comprehensive report on a thin film of calcite mineral (CaCO3) that can be used as a selective shield allowing dew condensation during the night. The increased cooling of  the exposed shield (condenser) was exploited using high IR emissivity of the calcite in the atmospheric window (8-13 microns). The dew harvesting happens when the temperature of a shield is below the dew point temperature. The average daily dew yield obtained varied from 0.75 to 1.2 L/m2 per night. The main goal of this paper was to estimate dew harvesting with high yield as a function of condenser temperature and thickness condenser.

PP48

PP49

S. M’Zerd1,2,+, I. Zorkani1, E. Feddi2, M. Khenfouch3

 

1Groupe des Nanomatériaux et EnergiesRenouvelables, L P S,

FSDM, BP 1796, Université Sidi Mohamed Ben Abdellah-Fès-Morocco

2LaMScI,Group of Optoelectronicof Semiconductorsand Nanomaterials, ENSET, Rabat, Morocco

3Africa Graphene Center, Physicsdepartment, Eureka building, CSET, UNISA-Florida Campus, Roodepoort, 1709. Gauteng. South Africa.

 

Diamagnetic susceptibility, polarisabilityand photoionization cross section of a single dopant in GaAs core/shell Quantum Dot.

 

This paper reports a recent study on the diamagnetic susceptibility, polarisabilityand photoionization cross section (PCS) of a single dopant in GaAs core/shell Quantum Dot. The numerical calculations are performed for GaAs with Spherical and cylindrical shape, considering the position of the impurity and an infinite deep potential. Our numerical calculations reveal that all these fundamental parameters are deeply dependent on the core and shell radii The results show that the diamagnetic susceptibility increases with the reduction in dot sizes, strongly depends on size of the nanostructure, decreases with increasing the quantum dot size and tends towards the bulk limit (-1,1 a.u.). The study of the localization of the impurity inside the core/shell indicates that the Stark shift is more important when the impurity is positioned at the core/shell center and becomes less important when the donor moves toward the boundaries of the shell layer. In order to understand the optical responses during the photoionization of the donor dopant, we investigated the PCS under electric field, ionized donor position, and core/shell sizes.

 

PP49

PP50

 Y. Chrafih1,*, Kh. Rahmani1, M.Khenfouch2, O.Bajjou3, I. Zorkani4

 

 1Faculty of Polydisciplinary, (ERPTM), BP 590, 23000 Beni Mellal-Morocco

2Department of Physics, University of South Africa, Private Bag X90, Florida, 1710, South Africa.

3Faculty of Sciences and Technologies, (LPM), BP 592, 23000 Beni Mellal-Morocco.

4Faculty of Sciences Dhar Mehraz, (LPS), Fès-Morocco

Email: 1,*younescharafih@gmail.com 

 Resonant optical properties of AlGaAs/GaAs multiple-quantum-well under the effect of hydrostatic pressure

 

PP50

For reasons of confidentiality the poster link has been intensively disabled

PP51

E. Haily a, c +, L. Bih a,b, S. Yousfi a, A. El bouari c, B. Manoun d,e

a Equipe Physico-Chimie la Matière Condensée (PCMC), Faculté des Sciences de Meknès, Maroc.

b Département Matériaux et Procédés, ENSAM Meknès, Université Moulay Ismail, Meknès, Maroc.

c Laboratoire Physico-Chimie des Matériaux Appliquées (LPCMA), Faculté des Sciences Ben M’sik Casablanca, Maroc  d Université Hassan 1er, Laboratoire Rayonnement-Matière et Instrumentation, (S3M), FST Settat, Morocco.              e Materials Science and Nano-engineering, Mohammed VI Polytechnic University, Lot 660 Hay Moulay Rachid, Ben Guerir, Morocco

Structural, and dielectric properties of BaO-K2O-TiO2-P2O5 glasses and its associated glass-ceramics

 

The glasses in the BaO-K2O-TiO2-P2O5 quaternary system were elaborated by conventional quenching method. The structure of the glasses was studied by density and molar volume measurements, and Raman spectroscopy. The results revealed that the BaO penetrates the glassy network as a modifier, and helps the closeness of the glassy structure. The controlled crystallization of the glasses was carried out to develop the glass-ceramics. X-ray diffraction was then used to identify the crystallized phases formed in the glass-ceramics. Dielectric and conductivity parameters of the glass-ceramics are performed by impedance spectroscopy in the temperature range of 300 to 573 K under various frequencies from 100 Hz to 1 MHz. The results obtained showed that the BaO gives, a stability behavior of εr and Tan δ as a function of frequency and temperature, and a dielectric isolation behavior to the glass-ceramics by increasing the dielectric constant and reducing the dielectric losses.

 

PP51

For reasons of confidentiality the poster link has been intensively disabled

PP52

N. Al armouzi,a,+  M. Mabrouki,a

a Industrial engineering laboratory, Faculty of science and technology, Department of physics, Beni mellal, Morocco

Effect of tin doping on structural, optical and electrical properties of ZnO thin films prepared by sol–gel method

 

In this paper we have prepared ZnO:Sn by sol gel method and deposited under thin films onto glass substrate via spin coating technique. The goal of this work was to study the effect of incorporation of Sn in zinc oxide in the electrical, optical and structural properties. We have used different characterization techniques of ZnO thin films namely: UV-visible, XRD, AFM and I(V). From the results, it revealed that the electrical resistivity and the thickness of the film decrease by increasing the Sn concentration. In the optical properties we have found that in the visible range above 400 nm a high transmittance for ZnO is observed and then deceases with Sn concentration. The calculated band gap of zinc oxide thin films also decreases with increasing doping concentration (0-3%). Sn doped ZnO exhibits clearly improved surface roughness, enhanced crystallite size, reduced resistivity and consequently improved conductivity. Among all of the tin doped zinc oxides that we have prepared, the doped films with 1.5 at. % Sn concentration present the best properties.

PP52

PP53

H. A. Albraikata, M. M. Allahama, M-Ali H. Al-Akhrasb, M.S. Mousaa

a Department of Physics, Mu’tah University, Al-Karak 61710, Jordan.

b Department of Physics, Jordan University of Science and Technology, Irbid, Jordan.

Field Electron Emission from Carbon Black Nanotips: Characterization and Analysis

 

As a cold field electron emitters, Carbon Black (CB) nanoparticles [1] will be investigated in this study under several conditions. To fabricate the emitter, tungsten blunt tips are prepared by electrochemical etching process [2]. Coating the blunt tip with a thin layer of epoxy (URP-4 resin) and Mounting the CB nanoparticles on the tungsten tip surface. The current – voltage characteristics of the samples were studied. Fowler – Nordheim and Murphy – Good plots were used to analyze the results [5, 6]. The relaxation and baking methods for samples were considered in this experiment under pressure of (10-7 mbar). Field emission microscope used to study the shape and intensity of emitted current on a fluorescent screen.  More sophisticated processes may enhance the adhesion of particles and exploit the low size and high surface area of them to reach a highest emitted current subjected to the lowest applied voltage.

PP53

PP54

M. Alabtha, M. Shatnawia, M. M. Allahamb, M. S. Mousab

a Department of Physics, The University of Jordan, Amman, Jordan.

b Department of Physics, Mu’tah University, Al-Karak 61710, Jordan.

Field Electron Emission from W – Tips Coated with various Thicknesses of Polystyrene – Characteristics & Analysis

 

This paper studies and analyzes the characteristics of cold field electron emission from clean Tungsten tips coated with an insulating layer [1 – 3] of polystyrene [4] using various thicknesses. The process testing the samples has been done under high vacuum conditions (10-8 mbar). Clean W – tips were prepared using electrochemical etching process. The current – voltage characteristics of the samples before and after being coated were studied, analyzed using the Fowler – Nordheim [5] and Murphy – Good plots [6] and were tested using the field emission orthodoxy test [7, 8]. Scanning electron micrographs for the samples under investigation have been imaged. Additionally, the electron emission patterns, before and after the coating process, are included here, in order to compare the results being obtained which enables us to study the effect of the coating. The results obtained should improve performance that will be presented and analyzed.

PP54

PP55

L. Nkhaili, A.Narjis , A. El kissani , A.Oueriagli , A. Outzourhit

 

Nanomaterials for Energy and Environment Laboratory, Physics Department,

Faculty of Sciences Semlalia. Cadi Ayyad University. PO Box 2390, Marrakech 40000. Morocco

Lahcen.com@hotmail.fr

 

A sample method to control the growth of copper oxide nanowires for solar cells and catalytic applications

 

Copper oxide Nanowires (CuO NWs) are very  promising for  nanotechnology. CuO NWs were synthesized by thermally oxidizing copper films 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 100 nm for all samples

Structural properties have been studied by X ray Diffraction (XRD) technique. Optical properties (especially the refractive index, absorption coefficient and optical band gap) were investigated by optical transmission measurements in the Ultraviolet-Visible-Near Infrared (UV-Vis-NIR) wavelength range. The morphological  properties of the CuO NWS have been studied using scanning electron microscopy (SEM) .

 

PP55

For reasons of confidentiality the poster link has been intensively disabled

PP56

Saleh H. Fawaeera, Moneeb Shatnawia, Mohammad M. Allahamb and Marwan S. Mousab

a Department of Physics, The University of Jordan, Amman, Jordan.

b Department of Physics, Mu’tah University, Al-Karak 61710, Jordan

Influence of Polystyrene layer on the Performance of Field Electron Emission from Nano-Apex Carbon Fiber Emitters

 

This research deals with the process of field electron emission from the surface of carbon fibers before [1 – 5] and after coating with polystyrene insulating layer [6] under high vacuum conditions. Polyacrylonitrile carbon fibers of type VPR – 19, thermally treated at 2800°C were used in this work. This investigation includes the current-voltage (I – V) characteristics, Fowler – Nordheim (F – N) and Murphy – Good (M-G) plots [7, 8]. Scanning electron micrographs have been obtained in addition to the field electron emission patterns has been recorded. Comparison between the emission process obtained from clean and composite emitters is reported. Significant improvement on the characteristics recorded from the emitters after being coated is observed.

PP56

PP57

A. Al Souda, T. Bollb, A. Knápekb, M. S. Mousaa,,+

a Surface Physics and Materials Technology lab, Department of Physics, Mutah University,    Al-Karak 61710, Jordan.

b Institute of Applied Materials, Karlsruhe Institute of Technology, Karlsruhe 76344, Germany

c Institute of Scientific Instruments of the CAS, 147, 612 64 Brno, Czech Republic

Observations on the effect of coating Nano-Tip Apex     with a thin layer of dielectric material on both electron and Ion Emission Mechanisms

This paper analyses the differences that occurred on field electron emission and ion emission after coating some tungsten tips with a thin layer of dielectric material. Additionally, the mechanism of emission of electrons through channels forming in the dielectric material is described. For the purposes of analysis, the emitters were prepared by coating a tungsten tip with a layer of Epoxylite® resin. A high-resolution scanning electron microscope (HRSEM) was used to scan the tip profile and measure the coating thickness. Field electron microscope (FEM) and Field ion microscope (FIM) have been used to study both: the emission-current distribution and the emission-ions distribution from the composite emitters. Two forms of emission patterns have been observed: a multi-spot pattern, from the clean emitters with irregularity in the substrate, and a bright single- spot pattern, from coated emitters with a high substrate.

 

PP57

PP58

 

 F.DJELTI 1 , A. OULD-ABBAS 1

 

1 Research unit of Materials and Renewable energies (URMER),

University Abou Bakr Belkaïd, B.P. 119, Tlemcen, Algeria

* Corresponding author: fdjeltiphd@Gmail.com

Temperature Influence On The Density Of Two-Dimensional Electron Gas In Al0.18Ga0.82N/GaN HEMT

 A promising sensing technology utilizes AlGaN/GaN high electron mobility transistors (HEMTs). HEMT structures have been developed for use in microwave power amplifiers due to their high two dimensional electron gas (2DEG) mobility and saturation velocity. The conducting 2DEG channel of AlGaN/GaN HEMTs is very close to the surface and extremely sensitive to adsorption of analytes. High-temperature effects on the electrical behavior of AlGaN/GaN HEMTs have been evaluated. dc measurements have been performed for different illumination and temperature conditions. The unpassivated devices present a good ohmic contact technology up to 550 °C in air. These high-temperature electrical measurements have also shown the existence of electrical traps. These traps are sensitive to the bias point, the illumination, and the temperature

PP58

PP59

D. Ait el haja,b, A. El kissania, H. Chaibb, , A. Oueriaglia ,A. Outzoughita

 

aNanomaterials for Energy and Environment Laboratory, Cadi Ayyad University, PB 2390, Marrakech, Morocco.

bMaterials and Energy Laboratory, Ibn Zohr University, Agadir, Morocco PB 32/S.

Growth of Cu2NiSnS4 Films by a Sol-gel Spin-coating Method for Photovoltaic Application- Effect of sulfur concentration

 

In this study, the copper iron tin sulfide Cu2FeSnS4 (CFTS) thin films have been prepared by the sol-gel method without a sulfurization step. The effect of annealing time under nitrogen atmosphere on the structural, morphological, compositional, and optical properties of CFTS thin films based on earth abundant and nontoxic elements has been presented. X-ray diffraction and Raman spectroscopy analysis revealed the formation of a pure phase of the annealed thin film at 400 °C for 40 min, with majors and intense peaks without secondary phase. The crystallite size was increased, according to the increase of annealing time; it becomes 60 nm at 400 °C for 40 min. Scanning electron microscopy analysis show uniform, smooth, dense and pinhole free of the annealed thin film at 400 °C.  The optical band gap decreases by annealing, it becomes 1.4 eV at 400 °C, and the absorption coefficient is higher than 104 cm-1 in visible regions, suggesting its potential use in low-cost thin film solar cells. In addition, the CFTS-based solar cell was fabricated and characterized.

Keywords: Copper Fer tin sulfide; sol-gel spin-coating; structural; morphological; optical; solar cell thin film

 

PP59

PP60

E. Floric Rakotonarivoa, C. N. Abouloulaa, A. Narjisa, L. Nkhailia, F. Brouilletteb, A. Oueriaglia,*

 

a Laboratoire des Matériaux de l’Energie et de l’Environnement (LaMEE, ex-LN2E), Faculté des Sciences Semlalia, Université Cadi Ayyad, BP 2390, 40000, Marrakech, Maroc

b Institut d’Innovations en Écomatériaux, Écoproduits et Écoénergies, à base de biomasse (I2E3), Sciences et Génie des Matériaux Lignocellulosique, 3351 Forges Boulevar, Trois-Rivières (Québec) G8Q 4M3, Canada.

 

Optimization photoelectrochemical of the cuprous oxide (Cu2O),  by electrodeposition

 

 

The control of structural properties of the cuprous oxide is an available way to optimize the condition of their deposition for better performance in solar cells and electrodes for PEC hydrogen production. In this study, series of Cu2O thin films were synthesized using electrodeposition method while varying the pH of the electrolyte, the applied potential. The found results reveal that with a pH of 12 and a potential of -0.35 V  lead to obtain the smallest band-gap energy with the best crystallinity.The effect of OH ions concentration on the atomic ratio Cu:O and the energy levels in the electronic configuration of cobalt are assumed to be the underlying causes to interpret this optimization

The DRX analysis showed that all samples synthesized by applying a potential of -0.4 V and varying the pH value, varying the applied potential and setting the ph=12, all spectra exhibit the cubic structure of pure Cu2O, with a preferential peak (111), according to JCPDS:05-0667. The UV-Vis measurements allowed us to visualize the optical properties of the film, notably the transmission spectra, and the band-gap energy Eg.

PP60

PP61

M. Khadiri1, M. Elyaagoubi2, R. Idouhli1, M. El Mabrouki3, A. Abouelfida1, A. Outzourhit2

 

1-  Physical Chemistry of Materials and Environment Laboratory, Department of Chemistry, Faculty of Science Semlalia, University Cadi Ayyad, Marrakech, Morocco

2- Laboratory of Nanomaterials for Energy and the Environment (LN2E), Faculty of Sciences Semlalia Marrakech, Cadi Ayyad University, BP 2390, Morocco

               1-          Laboratory of Industrial Engineering Beni-Mellal TSF, BP 523, 23000 Morocco

khadiri_m@gmx.fr;

 

Electrochemically Deposited Thermoelectric Binary bismuth selenium thin films

 

 

Compounds bismuth chalcogenides are solicited in many applications, such as electrochromic materials, optical coatings and photocatalysis. These compounds are presented generally under Bi2X3 forms, where X is O, S, Se, Te. Bi2Se3 is a thermoelectric material, with a potential application in thermoelectric, optical photoconductive and electrochemical hydrogen storage devices. Bi2Se3 films can be obtained by several techniques, such as vapor deposition (PVD), molecular beam epitaxial (MBE) and hydro- thermal methods.

 Electrodeposition could be a good alternative to obtain Bi2Se3 films.

PP61

PP62

 

H. El Aakib1, N. Rochdi2,  J.F. Pierson3, A. Tchenka1, A. Agdad1, A. Outzourhit1

 

1Solid state physics and thin films laboratory, Faculty of Science Semlalia, Cadi Ayyad University, PO Box: 2390, 40000 Marrakech, Morocco

2Atomic Spectroscopy & Imaging of Materials laboratory, Faculty of Science Semlalia, Cadi Ayyad University, PO Box: 2390, 40000 Marrakech, Morocco

3Institut Jean Lamour (UMR CNRS 7198), Université de Lorraine, Campus ARTEM, 2 allée André Guinier, 54011 Nancy cedex, France

 

+ Author for correspondence: hind.elaakib@gmail.com

 

 

Preparation and characterization of copper oxide thin films by RF sputtering for solar selective absorbers application

 

 

Copper oxide thin films were prepared using reactive RF-sputtering technique from a pure Cu target in a gas mixture (O2 and Ar) under different oxygen pressures (10 %, 30 %, 40 % and 50 %) and at 150 W of RF power. The crystallite size varies with pressure of oxygen reaching a minimum at 50 %. The density and structural properties of the sputtered thin films were explored by reflectometry and X-ray diffraction. It has been found that the obtained copper oxide thin films are crystalline. The optical properties were studied by using the optical transmission measurements in the UV-visible-near IR wavelength range. The optical band gap is shown to increase by increasing oxygen pressure. The cross-sectional micrographs of copper oxide thin films and the selected area electron diffraction were also studied by transmission electron microscopy. All the obtained thin film have good solar selectivity. The obtained films could be suitable and used as a novel candidate material for selective absorber application [1,2].

Keywords: Copper oxide thin films; Reactive RF-sputtering; solar selective absorbers; Reflectometry; Optical, structural and electrical properties.

PP62

For reasons of confidentiality the poster link has been intensively disabled


 

PP64

 

L. Kreit1, A. Zyane2, I. Bouknaitir1, M. El Hasnaoui1, M. E. Achour1 *, L. C. Costa3, A. Belfkira2

 

1LASTID Laboratory, Sciences Faculty, Ibn Tofail University, B.P. 133, 14000 Kenitra, Morocco

2Laboratoire de Chimie Bioorganique et Macromoléculaire (LCBM), Faculty of Sciences and Technics, Cadi Ayyad University, Marrakech, Morocco

3I3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal

* achour.me@univ-ibntofail.ac.ma

 

Dielectric relaxations in biocomposite material based on green microcrystalline cellulose reinforced vinyl resin matrix

 

 In this study microcrystalline cellulose (MCC) was used to improve the dielectric properties of a commercial vinylic resin (VR) by using a green method. The impedance spectroscopy technique was used to measure the dielectric parameters of the VR/MCC composite over the temperature range from 240 to 400 K and frequency range from 100 Hz to 1 MHz. Two relaxations processes were identified. The first one appears at low frequency region, and it is ascribed to a α-relaxation associated with the glass transition of the vinyl resin matrix. The second one, appearing above glass transition and low frequencies, was attributed to the interfacial polarization effect (MWS-relaxation) due to the accumulation of charges at the cellulose microcrystal/matrix interface. The relaxation parameters were evaluated from isothermal runs of the dielectric spectra by applying the Bergman model.

Keywords: Microcrystalline cellulose; Vinyl resin, Dielectric relaxations, Thermal behavior.

 

 PP64

PP65

 

Sara Lakhouil1, a), Sofia Boukheir1, AbdelouahedChbihi1, Amal Matal1, SanaeNaamane1

 

1Moroccan foundation for Advanced Science Innovation and Research (MAScIR)-Rue Mohamed Al Jazouli, Rabat, Morocco

Corresponding author:  s.lakhouil@mascir.com

 

Durability study of solar mirrors by an outdoor exposure in a desertic site

The profitability of concentrating solar powerplants(CSP) is conditioned by the durability of solar reflectors because of their main function to reflect solar radiations towards receivers. But operating sites undergo different climatic aggressions likewind, sand storms and rainfall which weaken reflectors overtime. So the durability study and the life time prediction of solar mirrors is very important.

The life time of solar mirrors is conditioned by several factors:

•Exposure conditions: Inclination  angle, Orientation after the cardinal points…;

•Environmental conditions: Irradiation, Temperature, winds and storms, snow…;

•Nature of mirrors: glass mirrors,  polymericmirrors, aluminum mirrors…;

•Manufacturing process of coating: anti-soiling, hardcoating…;

•Protective back side coatings.

This work aims to study the effect of orientation and  inclination on the solar reflectors durability in correlation with wind speed and direction by an outdoor exposure in a desertic site.

 

PP65