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Comprehensive Analysis of CuIn1-xGaxSe2Based Solar Cells with Zn1-yMgyO Buffer Layer

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materials sciences and applications 2020年第12期11卷 880-892页

作者： Soumaïla Ouédraogo Marcel Bawindsom Kébré Ariel Teyou Ngoupo Daouda Oubda François Zougmoré laboratoire de matériaux et Environnement (LA.M.E)-UFR/SEA Université Joseph Ki-ZERBO Ouagadougou Burkina Faso Département de Physique Faculté des Sciences Université de Yaoundé I Yaoundé Cameroun

The development of cadmium-free CIGS solar cells with high conversion efficiency is crucial due to the toxicity of cadmium. Zinc-based buffer layers seem to be the most promising. In this paper, a numerical analysis using SCAPS-1D software was used to explore the Zn(Mg,O) layer as an alternative to the toxic CdS layer. The effect of several properties such as thickness, doping, Mg concentration of the Zn(Mg,O) layer on the current-voltage parameters was explored and their optimal values were proposed. The simulation results reveal that the optimal value of the ZMO layer thickness is approximately 40 nm, the doping at 1017 cm-3 and an Mg composition between 0.15 and 0.2. In addition, the effect of Gallium (Ga) content in the absorber as well as the Zn(Mg,O)/CIGS interface properties on the solar cell’s performance was examined. The results show that contrary to the CdS buffer layer, the best electrical characteristics of the ZMO/CIGS heterojunction are obtained using a Ga-content equal to 0.4 and high interface defect density or unfavorable band alignment may be the causes of poor performances of Zn(Mg,O)/CIGS solar cells in the case of low and high Mg-contents.

关键词： Device Modeling Zn(Mg O) Cu(In Ga)Se2 Interface Sates Conduction Band Offset

Non-adiabatic approximations in time-dependent density functional theory: progress and prospects

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npj Computational materials 2023年第1期9卷 1105-1119页

作者： Lionel Lacombe Neepa T.Maitra laboratoire des Solides Irradiés École PolytechniqueInstitut Polytechnique de ParisF-91128 PalaiseauFrance Department of Physics Rutgers UniversityNewarkNJ 07102USA

Time-dependent density functional theory continues to draw a large number of users in a wide range of fields exploring myriad applications involving electronic spectra and *** in principle exact,the predictivity of the calculations is limited by the available approximations for the exchange-correlation *** particular,it is known that the exact exchange-correlation functional has memory-dependence,but in practise adiabatic approximations are used which ignore *** we review the development of non-adiabatic functional approximations,their impact on calculations,and challenges in developing practical and accurate memory-dependent functionals for general purposes.

关键词： dynamics adiabatic functional

Well- and Ill-Posedness Issues for a Class of 2D Wave Equation with Exponential Growth

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Journal of Partial Differential Equations 2011年第4期24卷 361-384页

作者： MAHOUACHI Olfa SAANOUNI Tarek laboratoire d＇e＇quations aux de＇rivdes partielles et applications Faculte＇ des sciences detunis De＇partement de Mathe＇matiques Campus universitaire 1060 Tunis Tunisie.

Extending the previous work [1], we establish well-posedness results for a more general class of semilinear wave equations with exponential growth. First, we investigate the well-posedness in the energy space. Then, we prove the propagation of the regularity in the Sobolev spaces HS（IR^2） with s 〉 1. Finally, an ill-posedness result is obtained in HS（IR^2） for s 〈 1.

关键词： Nonlinear wave equation well-posedness ill-posedness Moser-Trudinger inequality finite speed of propagation.

Analytical fits to the synchrotron functions

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Research in Astronomy and Astrophysics 2013年第6期13卷 680-686页

作者： Mourad Fouka Saad Ouichaoui Research Center in Astronomy Astrophysics and GeophysicsB. P. 63 Algiers ObservatoryBouzaréah Algiers Algeria Université des sciences et de la Technologie Houari Boumediène (USTHB) Faculté dePhysique Laboratoire SNIRMB.P. 32 El-Alia 16111 Bab Ezzouar Algiers Algeria

Accurate fitting formulae to the synchrotron function, F（x）, and its com- plementary function, G（x）, are performed and presented. The corresponding relative errors are less than 0.26% and 0.035% for F（x） and G（x）, respectively. To this end we have, first, fitted the modified Bessel functions, Ks/3（x） and K2/3（x）. For all the fitted functions, the general fit expression is the same, and is based on the well known asymptotic forms for low and large values of z for each function. It consists of multi- plying each asymptotic form by a function that tends to unity or zero for low and large values of z. Simple formulae are suggested in this paper, depending on adjustable parameters. The latter have been determined by adopting the Levenberg-Marquardt algorithm. The proposed formulae should be of great utility and simplicity for com- puting spectral powers and the degree of polarization for synchrotron radiation, both for laboratory and astrophysical applications.

关键词： radiation processes: non thermal -- methods: analytical

Synthesis and Properties of Polythiophene Benzylidene and Their Photovoltaic applications

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materials sciences and applications 2011年第8期2卷 1014-1021页

作者： Reguig Bendoukha Abdelkarim Ahmed Yahiaoui Aicha Hachemaoui Mohammed Belbachir Abdelbasset Khelil laboratoire de chimie Organique Macromoleculaire et des Materiaux(LCOMM)Universite de MascaraFaculte des Sciences et de la TechnologieMascaraAlgerie laboratoire de Chimie des Polymeres Universite d’OranOranAlgerie LPCM2E Universited’Oran Es-SeniaAlgerie

Research on organic solar cells has a craze importance because they show very interesting properties including their flexibility and the opportunity to be made into large surfaces. However, their stability and performance should be significantly improved compared to their current state. A nominal output of around 10% will be the goal for the coming years. The use of organic materials for photovoltaic applications is the subject of intense research in recent years. This work is based in part on the development of new conjugated polymers. In this paper, we present the synthesis and characterization of poly [(thiophene-2,5-diyl)-co-(benzylidene)] PTB catalysed by Maghnite-H+, used in the active layer of the solar cell organic heterojunction with PCBM (derivative of C60) was used as a junction of the solar cell: Glas/ITO/BCP/C60/PTB/Au/Al. A current density of short circuit of about Jcc 0.1mA/cm2 was obtained for this structure with a yield of around 0.15%.

关键词： Polymerization Conjugated Polymers UV-Vis Spectroscopy IR Spectroscopy Yield Calculation Solar Cell Organic Heterojunction

Terahertz Radiation from a Longitudinal Electric Field Biased Femtosecond Filament in Air

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Chinese Physics Letters 2020年第6期37卷 44-47页

作者： Yi Lin Shaojie Liu Aurélien Houard AndréMysyrowicz Vladimir T.Tikhonchuk Shanghai Key Lab of Modern Optical System University of Shanghai for Science and TechnologyShanghai 200093China laboratoire d’Optique Appliquée ENSTA ParisEcole PolytechniqueCNRSInstitut Polytechnique de Paris828 Boulevard des Maréchaux91762 Palaiseau cedexFrance Centre Lasers Intenses et applications University of Bordeaux-CNRS-CEA351 Cours de la Liberation33405 Talence cedexFrance ELI-Beamlines Institute of PhysicsCzech Academy of Sciences25241 Dolni BrezanyCzech Republic

The terahertz(THz)temporal waveform and spectrum from a longitudinal electrically biased femtosecond filament is studied *** initial direction of the electron motion inside the unbiased filament plasma is deduced from the transformation of the THz temporal waveform with applied fields of opposite ***,a spectrum shift to lower frequency of the THz spectrum is observed in the presence of a biased *** agrees well with theoretical predictions.

关键词： field. spectrum opposite

Solution flow rate influence on ZnS thin films properties grown by ultrasonic spray for optoelectronic application

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Journal of Semiconductors 2018年第9期39卷 1-7页

作者： A.Derbali H.Saidi A.Attaf H.Benamra A.Bouhdjer N.Attaf H.Ezzaouia L.Derbali M.S.Aida Laboratory of Thin Films and applications LPCMA University of Biskra Algeria BP 145 RP 07000 Biskra Algerie laboratoire de Couches Minces et Interfaces Faculte des sciences Universite de Constantine Algeria Laboratory of Semiconductors Nanostructures and Advanced Technology (LSNTA) Research and Technology Centreof Energy BorjCedria Science and Technology Park BP 95 2050 Hammam-Lif Tunisia Department of Physics Faculty of sciences King Abdulaziz University Djeddah KSA

The aim of this work is to investigate the dependence of Zn S thin films structural and optical properties with the solution flow rate during the deposition using an ultrasonic spray method. The solution flow rate ranged from 10 to 50 m L/h and the substrate temperature was maintained at 450 °C. The effect of the solution flow rate on the properties of Zn S thin films was investigated by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, optical transmittance spectroscopy（UV–V） and the four-point method. The X-ray diffraction analysis showed that the deposited material was pure zinc sulphide, it has a cubic sphalerite structure with preferential orientation along the（111） direction. The grain size values were calculated and found to be between 38 to 82 *** analysis revealed that the deposited thin films have good adherence to the substrate surfaces, are homogeneous and have high density. The average transmission of all films is up more than 65% in the range wavelength from 200 to 1100 nm and their band gap energy values were found between 3.5–3.92 e V. The obtained film thickness varies from 390 to 1040 nm. Moreover, the electric resistivity of the deposited films increases with the increasing of the solution flow rate between 3.51 × 10^5 and 11 × 10^5 Ω·cm.

关键词： zinc sulphide X-ray diffraction ultrasonic spray solution flow rate optical and electrical properties

Optimization of 6,13Bis(triisopropylsilylethynyl)pentacene (TIPS-Pentacene) Organic Field Effect Transistor: Annealing Temperature and Solvent Effects

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materials sciences and applications 2018年第11期9卷 900-912页

作者： Diallo Abdoul Kadri Diallo Abdou Karim Mané Seck Kobor Diouma Pasquinelli Marcel laboratoire de Chimie et de Physique des matériaux (LCPM) Assane Seck University Ziguinchor Senegal Gaston Berger University Department of Applied Physics Saint Louis Senegal OPTO-PV Group/Institut matériaux Microélectronique Nanosciences de Provence (IM2NP) Marseille France

In this contribution, we report on the effect of solvents with different boiling points and annealing temperature on the performance of TIPS-pentacene transistors. Several solvents have been used for TIPS-pentacene thin film processing: toluene, chlorobenzene and tetrahy-drofuran. To study the influence of solvent and temperature;the electrical parameters of TIPS-pentacene field effect transistor were measured. The highest values of mobilities were 7.1 × 10-3 cm2·V-1·s-1, 4.5 × 10-3?cm2·V-1·s-1 and 1.43 × 10-3 cm2·V-1·s-1 respectively for TIPS-pentacene field effect transistor using chlorobenzene, toluene and tetrahydrofuran and annealed respectively at 120°C, 150°C and 120°C. We have correlated these electrical performances with AFM images in order to point out the role of morphological properties. It is found that the grain size, and roughness highly affect the electrical parameters.

关键词： Tips-Pentacene Transistor Solvent Annealing Temperature

Entropy Unilateral Solution for Some Noncoercive Nonlinear Parabolic Problems Via a Sequence of Penalized Equations

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Analysis in Theory and applications 2017年第1期33卷 29-45页

作者： Ahmed Aberqi J.Bennouna H.Redwane Universite Sidi Mohammed Ben Abdellah Departement de MathmatiquesLaboratoire LISA Ecole Nationale des Sciences Appliques Fes Morocco Faculte des sciences Juridiques Economiques ei Sociales Universite Hassan 1 B.P 784 SettatMorocco

We give an existence result of the obstacle parabolic equations3b（x,u） div（a（x,t,u, Vu））＋div（（x,t,u））=f in QT, 3twhere b（x,u） is bounded function ot u, the term atva,x,r,u, v u）） is a Letay type operator and the function is a nonlinear lower order and satisfy only the growth condition. The second term belongs to L1 （QT）. The proof of an existence solution is based on the penalization methods.

关键词： Obstacle parabolic problems entropy solutions penalization methods.