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Partager le résultat de cette recherche Interroger des sources externesContribution à l’étude du transport électrique à travers des oxydes très minces (<10nm) dans des structures MOS / Rachida Bensegueni
Titre : Contribution à l’étude du transport électrique à travers des oxydes très minces (<10nm) dans des structures MOS Type de document : texte imprimé Auteurs : Rachida Bensegueni, Auteur ; Saida Latreche, Directeur de thèse Année de publication : 2016 Importance : 166 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Semi-conducteurs Microelectronic down-scaling strained Si channel high-k dielectric mobility gate leakage currents direct tunneling current Microélectronique miniaturisation MOSFET Silicium contraint diélectrique haute
permittivité mobilité courants de fuites courant tunnel direct الالكترونيات الدقيقة التصغير السيليكون المتوترة ثنائية المحور العازل عالي السماحية التىقل الالكتروني التسربات تيار تونالIndex. décimale : 621 Electronique Résumé : The continuous down-scaling of MOS transistors dimensions over the last years allowed a significant revolution in the semiconductor industry. However, in order to maintain this trend, shrinking of conventional n MOS dimensions is no more sufficient enough and replacement of some transistor materials is one of the alternative ways currently under study to solve this issue. In this context, the work presented here, on the study of the transport properties of the nMOS architectures combining both new technology options; a high-k gate dielectric in place of the SiO2 and a biaxialy tensile strained channel.
Firstly, the influence of biaxial tensile strain on the electrical properties of the n-MOS transistor has been investigated using a numerical solution of drift diffusion partial equations.
The simulation results showed a significant improvement in electrons mobility and an increase in current ID (VD).
Then, we study the impact of the incorporation of a high-k gate stack on improving leakage through the oxide. The calculation results obtained from the ATLAS (SILVACOTCAD) simulator have shown that the use of high dielectric constant oxides significantly reduces the tunneling leakage current through increased physical thickness of the stack.
However, we noted a decrease of the electron mobility in the channel If MOS transistors with a high-k dielectric HfO2 hafnium relative to SiO2 Finally, the feasibility and interest to introduce a strained silicon channel to counteract the degradation of mobility associated with stacking metal / HfO2 are then discussed.
Note de contenu :
Annexe I: discrétisation des équations par la méthode des différences finies
Annexe II: simulation électrique par ATLAS (SILVACO-TCAD)Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BEN6980.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10415 Contribution à l’étude du transport électrique à travers des oxydes très minces (<10nm) dans des structures MOS [texte imprimé] / Rachida Bensegueni, Auteur ; Saida Latreche, Directeur de thèse . - 2016 . - 166 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Semi-conducteurs Microelectronic down-scaling strained Si channel high-k dielectric mobility gate leakage currents direct tunneling current Microélectronique miniaturisation MOSFET Silicium contraint diélectrique haute
permittivité mobilité courants de fuites courant tunnel direct الالكترونيات الدقيقة التصغير السيليكون المتوترة ثنائية المحور العازل عالي السماحية التىقل الالكتروني التسربات تيار تونالIndex. décimale : 621 Electronique Résumé : The continuous down-scaling of MOS transistors dimensions over the last years allowed a significant revolution in the semiconductor industry. However, in order to maintain this trend, shrinking of conventional n MOS dimensions is no more sufficient enough and replacement of some transistor materials is one of the alternative ways currently under study to solve this issue. In this context, the work presented here, on the study of the transport properties of the nMOS architectures combining both new technology options; a high-k gate dielectric in place of the SiO2 and a biaxialy tensile strained channel.
Firstly, the influence of biaxial tensile strain on the electrical properties of the n-MOS transistor has been investigated using a numerical solution of drift diffusion partial equations.
The simulation results showed a significant improvement in electrons mobility and an increase in current ID (VD).
Then, we study the impact of the incorporation of a high-k gate stack on improving leakage through the oxide. The calculation results obtained from the ATLAS (SILVACOTCAD) simulator have shown that the use of high dielectric constant oxides significantly reduces the tunneling leakage current through increased physical thickness of the stack.
However, we noted a decrease of the electron mobility in the channel If MOS transistors with a high-k dielectric HfO2 hafnium relative to SiO2 Finally, the feasibility and interest to introduce a strained silicon channel to counteract the degradation of mobility associated with stacking metal / HfO2 are then discussed.
Note de contenu :
Annexe I: discrétisation des équations par la méthode des différences finies
Annexe II: simulation électrique par ATLAS (SILVACO-TCAD)Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BEN6980.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10415 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEN/6980 BEN/6980 Thèse Bibliothèque principale Thèses Disponible
Titre : "Spéciation du Phosphore dans des Sédiments Aquatiques Optimisation Analytique Application Environnementale" Type de document : texte imprimé Auteurs : Sarah Azzouz, Auteur ; Chahrazed Boukhalfa, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2014 Importance : 132 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : phosphore sédiment spéciation adsorption mobilité Rhumel Boumerzoug El-kebir
phosphorus sediment speciation mobility El-kebirIndex. décimale : 540 Chimie et sciences connexes Résumé : "In this study, sediments samples were collected at three oueds in the north-east Algeria: oued
El-Kebir, oued Boumerzoug and oued Rhumel.
The mineralogical composition of the sediments was evaluated by X-ray fluorescence and
Infrared analysis. The contents of metals Al, Ca, Fe, Mn, organic matter and total phosphorus
were determined. Generally, the studied sediments are characterized by an alkaline pH, a high
electrical conductivity and significant contents of organic matter. The X-ray fluorescence
shows that the main components of the sediment matrix are calcium in major part, iron,
silicon and aluminum. The infrared spectra show the presence of carbonates, goethite and
Kaolinite.
The evaluation of the phosphorus retention in the sediments of the three oueds was assessed
by fractionation and adsorption tests. The obtained results show that phosphorus is mainly in
inorganic form with prevalence of calcic fraction. The phosphorus retention depends on the
samples composition. The sediments of oued El-Kebir retain more phosphorus than those of
oued Boumerzoug and Rhumel.
In a relation with the sediments composition and the method of phosphorus determination, a
phosphorus extraction scheme is proposed in this study by optimizing the used reagents and
the operating conditions.
By applying this extraction scheme, the spatiotemporal evolution of phosphorus speciation
during the year 2012, was studied in the sediments of the rivers which cross Constantine city:
oued Rhumel and its tributary Boumerzoug.
In the sediments of the two streams, the results show the predominance of the residual
fraction and the importance of phosphorus bound to detrital apatite. The evolution of the
exchangeable fraction and that related to authigenic apatite depends on the pH of the
sediments. The reducible fraction is characterized by a significant spatiotemporal evolution.
At the end of the summer period, the contribution of the residual organic fraction is less
significant.
Spatiotemporal changes in the distribution and the mobility of phosphorus are recorded in the
sediments of oued Rhumel. In those of oued Boumerzoug, phosphorus is more mobile in the
winter and spring."
Diplôme : Doctorat En ligne : ../theses/chimie/AZZ6500.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9614 "Spéciation du Phosphore dans des Sédiments Aquatiques Optimisation Analytique Application Environnementale" [texte imprimé] / Sarah Azzouz, Auteur ; Chahrazed Boukhalfa, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2014 . - 132 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : phosphore sédiment spéciation adsorption mobilité Rhumel Boumerzoug El-kebir
phosphorus sediment speciation mobility El-kebirIndex. décimale : 540 Chimie et sciences connexes Résumé : "In this study, sediments samples were collected at three oueds in the north-east Algeria: oued
El-Kebir, oued Boumerzoug and oued Rhumel.
The mineralogical composition of the sediments was evaluated by X-ray fluorescence and
Infrared analysis. The contents of metals Al, Ca, Fe, Mn, organic matter and total phosphorus
were determined. Generally, the studied sediments are characterized by an alkaline pH, a high
electrical conductivity and significant contents of organic matter. The X-ray fluorescence
shows that the main components of the sediment matrix are calcium in major part, iron,
silicon and aluminum. The infrared spectra show the presence of carbonates, goethite and
Kaolinite.
The evaluation of the phosphorus retention in the sediments of the three oueds was assessed
by fractionation and adsorption tests. The obtained results show that phosphorus is mainly in
inorganic form with prevalence of calcic fraction. The phosphorus retention depends on the
samples composition. The sediments of oued El-Kebir retain more phosphorus than those of
oued Boumerzoug and Rhumel.
In a relation with the sediments composition and the method of phosphorus determination, a
phosphorus extraction scheme is proposed in this study by optimizing the used reagents and
the operating conditions.
By applying this extraction scheme, the spatiotemporal evolution of phosphorus speciation
during the year 2012, was studied in the sediments of the rivers which cross Constantine city:
oued Rhumel and its tributary Boumerzoug.
In the sediments of the two streams, the results show the predominance of the residual
fraction and the importance of phosphorus bound to detrital apatite. The evolution of the
exchangeable fraction and that related to authigenic apatite depends on the pH of the
sediments. The reducible fraction is characterized by a significant spatiotemporal evolution.
At the end of the summer period, the contribution of the residual organic fraction is less
significant.
Spatiotemporal changes in the distribution and the mobility of phosphorus are recorded in the
sediments of oued Rhumel. In those of oued Boumerzoug, phosphorus is more mobile in the
winter and spring."
Diplôme : Doctorat En ligne : ../theses/chimie/AZZ6500.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9614 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité AZZ/6500 AZZ/6500 Thèse Bibliothèque principale Thèses Disponible
