M. BEN YETTOU Samia

Prof

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Department

Departement of Physics

Research Interests

Physique des semi-conducteurs (les composes, les alliages semi-conducteurs, Propriétés physiques) - les matériaux pérovskites pour applications photovoltaïques Physique des semi-conducteurs , les matériaux pérovskites pour applications photovoltaïques, physique du solide

Contact Info

University of M'Sila, Algeria

Email : samia.benyettou@univ-msila.dz

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Recent Publications

2016

Physique du Solide

Le but de ce cours est de donner les bases essentielles de la structure de la matière comme préparation au cours de physique de l'état solide (maille, nœud , Réseau cristallin, structure cristalline, système cristallin, les indices d’une direction ou d’un plan cristallographique, diffraction des rayons X dans un solide, propriétés thermiques et électriques des solides, bandes d’énergie dans un semi-conducteur).
Citation

M. BEN YETTOU Samia, (2016), "Physique du Solide", [national] Université Mohamed Boudiaf de M'sila

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Calcul de premier principe de quelques propriétés physiques de quelques alliages semi-conducteurs

Wide band gap II-VI compound semiconductors are expected to be one of the most vital materials for high performance optoelectronic devices such as light-emitting diodes and laser diodes operating in the blue or ultraviolet spectral region. Besides, the high ionicity of these compounds makes them good candidates for high electro-optical and electromechanical coupling.
The objective of this thesis is to study the structural, electronic, elastic, piezoelectric and dynamic of the CdSexTe1-x alloy properties in both zinc blend and wurtzite phases with ab-initio methods.
Our calculations are based on the method of the pseudo-potentials and plane waves, Our study is based on functional theory (DFT) in the local density approximation (LDA) under the virtual Crystal approximation (VCA) and the density functional perturbation theory (DFPT).
On the one hand, our results are in agreement with the available experimental results and theoretical, and on the other hand are a reliable prediction.
Key words: structural properties, electronic properties, elastic properties, dynamic properties, II - VI semiconductor, ternary alloys, CdSexTe1-x.
Citation

M. BEN YETTOU Samia, (2016), "Calcul de premier principe de quelques propriétés physiques de quelques alliages semi-conducteurs", [national] Université Mohamed Khider de Biskra

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2015

First principles study of structural, elastic and piezoelectric properties of CdSexTe1−x ternary alloys in the wurtzite structure

We performed density functional theory studies of the structural, elastic and piezoelectric properties of CdSexTe1−x in the wurtzite structure. The compositional dependence of such properties of interest over the whole composition range was analyzed and discussed using an ab initio pseudopotential approach under the virtual crystal approximation within both the local density approximation (LDA) and the generalized gradient approximation (GGA). For parent compounds, i.e. CdTe and CdSe, our findings agree well with the available data in the literature. Our results for piezoelectric properties for the alloy under load in the wurtzite structure are reported for the first time and may serve as a reference for future studies. It is found that the employment of the GGA instead of the LDA has an effect on the structural, elastic and piezoelectric parameters of the material of interest.
Citation

M. BEN YETTOU Samia, (2015), "First principles study of structural, elastic and piezoelectric properties of CdSexTe1−x ternary alloys in the wurtzite structure", [national] Physica Scripta , JOP

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Elastic, lattice dynamical and thermal properties of zinc-blende CdSexTe1−x ternary alloys

Ab initio calculations in the framework of plane-wave pseudopotential implementation of the density functional theory with the local density approximation and response-function calculations have been performed so as to investigate elastic, lattice dynamical and thermal properties of zinc-blende CdSexTe1−x ternary alloys. The composition dependence of the elastic constants and phonon frequencies has been studied. In addition, the influence of temperature on the entropy and heat capacity is also examined and discussed. The results presented in the present contribution show good agreement with the data available in the literature and yield a general understanding of the fundamental properties of CdSexTe1−x ternary alloys.
Citation

M. BEN YETTOU Samia, (2015), "Elastic, lattice dynamical and thermal properties of zinc-blende CdSexTe1−x ternary alloys", [national] Chemical Physics , Elsevier BV

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