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Partager le résultat de cette recherche Interroger des sources externesÉlaboration et caractérisation d’un dépôt de couches minces d’oxyde de zinc par spray pyrolyse / Salah Boulmelh
Titre : Élaboration et caractérisation d’un dépôt de couches minces d’oxyde de zinc par spray pyrolyse Type de document : texte imprimé Auteurs : Salah Boulmelh, Auteur ; Lynda Saci, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 103 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Couche mince oxyde de zinc (ZnO) Spray Pyrolyses Diffraction rayons X Spectroscopie Raman UV-visible Méthode des quatre pointes Thin film zinc oxide (ZnO) Spray Pyrolysis X-ray diffraction Raman
spectroscopy four-points method الشرائح الرقيقة أكسيد الزنك الرش البروليزي الأشعة السينية مطيافية رامان أربع نقاط UV-VISIndex. décimale : 621 Electronique Résumé : The proposed topic in the context of this thesis focuses on the study, elaboration and characterization of pure zinc oxide (ZnO) thin films deposited on glass substrates by pyrolytic spraying technique mostly called SPRAY PYROLYSIS.
It's the effect of temperature and molarities on the physicochemical properties of ZnO thin films obtained by the spray process that interest us in this study.
Note that these deposits were developed at various temperatures (300 to 450°C) and molarities (0.05 to 0.4 M), using Zn (C2 H3 O2)2 • 2H2O an organometallic precursor.
The structural characterization by X-ray diffraction and Raman spectroscopy showed that the deposited films have a hexagonal polycrystalline wurtzite type structure whose
preferential crystallographic orientation is obtained according to the (100) plane.
Thus, we found an average crystallite size between 18 and 30 nm.
The optical characterization of the films was carried out using the UV-Visible spectroscopy in the spectral range from 200 to 800 nm. The results shows, that the transparence films are around 15 to 95%. The transmittance spectra analysis allowed us to determine the gap (3.16 to 3.3 eV) and the disorder of our estimated films (65.8 meV). These results are consistent with those obtained in the literature. We also conducted an electrical characterization of our samples by the four-point method. The deducted values of the pure zinc oxide electric conductivity are ranging from 8.15 to 80 (Ω.cm)
-1 at various temperatures and molarities. Thus, the deposited films have more conductive character for the deposit of ZnO in M=0.2 M and at 350°C.
In conclusion, the results show that films with low molarities (≤0,2 M) can be used as buffer layers in photovoltaic cells, while those with high molarities (˃0.2 M) are more promoters candidates for applications as gas sensors.
Diplôme : Magistère En ligne : ../theses/electronique/BOU6797.pdf Permalink : index.php?lvl=notice_display&id=10036 Élaboration et caractérisation d’un dépôt de couches minces d’oxyde de zinc par spray pyrolyse [texte imprimé] / Salah Boulmelh, Auteur ; Lynda Saci, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2015 . - 103 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Couche mince oxyde de zinc (ZnO) Spray Pyrolyses Diffraction rayons X Spectroscopie Raman UV-visible Méthode des quatre pointes Thin film zinc oxide (ZnO) Spray Pyrolysis X-ray diffraction Raman
spectroscopy four-points method الشرائح الرقيقة أكسيد الزنك الرش البروليزي الأشعة السينية مطيافية رامان أربع نقاط UV-VISIndex. décimale : 621 Electronique Résumé : The proposed topic in the context of this thesis focuses on the study, elaboration and characterization of pure zinc oxide (ZnO) thin films deposited on glass substrates by pyrolytic spraying technique mostly called SPRAY PYROLYSIS.
It's the effect of temperature and molarities on the physicochemical properties of ZnO thin films obtained by the spray process that interest us in this study.
Note that these deposits were developed at various temperatures (300 to 450°C) and molarities (0.05 to 0.4 M), using Zn (C2 H3 O2)2 • 2H2O an organometallic precursor.
The structural characterization by X-ray diffraction and Raman spectroscopy showed that the deposited films have a hexagonal polycrystalline wurtzite type structure whose
preferential crystallographic orientation is obtained according to the (100) plane.
Thus, we found an average crystallite size between 18 and 30 nm.
The optical characterization of the films was carried out using the UV-Visible spectroscopy in the spectral range from 200 to 800 nm. The results shows, that the transparence films are around 15 to 95%. The transmittance spectra analysis allowed us to determine the gap (3.16 to 3.3 eV) and the disorder of our estimated films (65.8 meV). These results are consistent with those obtained in the literature. We also conducted an electrical characterization of our samples by the four-point method. The deducted values of the pure zinc oxide electric conductivity are ranging from 8.15 to 80 (Ω.cm)
-1 at various temperatures and molarities. Thus, the deposited films have more conductive character for the deposit of ZnO in M=0.2 M and at 350°C.
In conclusion, the results show that films with low molarities (≤0,2 M) can be used as buffer layers in photovoltaic cells, while those with high molarities (˃0.2 M) are more promoters candidates for applications as gas sensors.
Diplôme : Magistère En ligne : ../theses/electronique/BOU6797.pdf Permalink : index.php?lvl=notice_display&id=10036 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/6797 BOU/6797 Thèse Bibliothèque principale Thèses Disponible
Titre : Elaboration et caractérisation des hétérojonctions à base de couches minces de ZnO et ZnS Type de document : texte imprimé Auteurs : Hichem Lekiket ; Univ. de Constantine, Éditeur scientifique ; Mohamed Salah Aida, Directeur de thèse Année de publication : 2008 Importance : 76 f. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Spray Couche mince ZnO Zns Hétérojonctions Index. décimale : 530 Physique En ligne : ../theses/physique/LeK5056.pdf Permalink : index.php?lvl=notice_display&id=3543 Elaboration et caractérisation des hétérojonctions à base de couches minces de ZnO et ZnS [texte imprimé] / Hichem Lekiket ; Univ. de Constantine, Éditeur scientifique ; Mohamed Salah Aida, Directeur de thèse . - 2008 . - 76 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Spray Couche mince ZnO Zns Hétérojonctions Index. décimale : 530 Physique En ligne : ../theses/physique/LeK5056.pdf Permalink : index.php?lvl=notice_display&id=3543 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité LEK/5056 LEK/5056 Thèse Bibliothèque principale Thèses Disponible
Titre : Elaboration de couches minces ZnO par ablation laser et caractérisation physique Type de document : texte imprimé Auteurs : Fouad Kermiche, Auteur ; A. Bouabellou, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2015 Importance : 129 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Sciences des matériaux ZnO couche mince ZnO dopé aluminium PLD RBS M-lines Effet hall thin films aluminum doped ZnO Hall Effect أكسید الزنك شرائح رقیقة الألمنیوم الإستئصال اللیزري PLD مطیافیة
رذرفورد (RBS) مطیافیة الخطوط السوداءLines-M أثر ھول ( Hall Effet"Index. décimale : 530 Physique Résumé : Our thesis aims to achieve and study of the physical properties (Structural, morphological, optical and electrical) of conductive and transparent thin layers of undoped zinc oxide (ZnO) and doped aluminum (AZO) prepared by the pulsed laser deposition technique (PLD) on glass and silicon substrates heated to 450°C.
The source used is a KrF excimer laser (248 nm, 25 ns, 2 J/cm2). The structural study by X-ray diffraction (XRD) showed that these layers has a hexagonal crystal structure with a preferential growth according to the (002) orientation, and a decrease in grain sizes of about 40 to 25 nm with increasing aluminum doping rates of 0 to 5 at%.
leading to a deterioration of the crystalline quality of the layers. The Atomic Force Microscope AFM was used to study the state of the surfaces and their roughness which was found to be between 3 and 15 nm. Rutherford backscattering spectroscopy RBS was used to determine the chemical composition and thickness of the prepared
films, the layer thickness ranges from about 179-366 nm. Study by UV-visible spectrophotometry showed that the transmittance of the samples is around 75% in visible with an optical band gap varying from 3.23 to 3.36 eV when the content of Al doping increases from 0 to 5 at.%. Analysis by (M-Lines) helped us to extract approximate values for the refractive index of these layers, which is between 1.83 and 1.97, and thicknesses very close from those estimated by the RBS analysis, as well as the possibility of using the layers in the field of the optical waveguide. In addition to these results, the electrical measurements by (Hall Effect) have shown that all the layers prepared in this study are n-type semiconductor, and that, the aluminum doping increases the concentration of charge carriers and reduces resistance.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/KER6718.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9905 Elaboration de couches minces ZnO par ablation laser et caractérisation physique [texte imprimé] / Fouad Kermiche, Auteur ; A. Bouabellou, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2015 . - 129 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Sciences des matériaux ZnO couche mince ZnO dopé aluminium PLD RBS M-lines Effet hall thin films aluminum doped ZnO Hall Effect أكسید الزنك شرائح رقیقة الألمنیوم الإستئصال اللیزري PLD مطیافیة
رذرفورد (RBS) مطیافیة الخطوط السوداءLines-M أثر ھول ( Hall Effet"Index. décimale : 530 Physique Résumé : Our thesis aims to achieve and study of the physical properties (Structural, morphological, optical and electrical) of conductive and transparent thin layers of undoped zinc oxide (ZnO) and doped aluminum (AZO) prepared by the pulsed laser deposition technique (PLD) on glass and silicon substrates heated to 450°C.
The source used is a KrF excimer laser (248 nm, 25 ns, 2 J/cm2). The structural study by X-ray diffraction (XRD) showed that these layers has a hexagonal crystal structure with a preferential growth according to the (002) orientation, and a decrease in grain sizes of about 40 to 25 nm with increasing aluminum doping rates of 0 to 5 at%.
leading to a deterioration of the crystalline quality of the layers. The Atomic Force Microscope AFM was used to study the state of the surfaces and their roughness which was found to be between 3 and 15 nm. Rutherford backscattering spectroscopy RBS was used to determine the chemical composition and thickness of the prepared
films, the layer thickness ranges from about 179-366 nm. Study by UV-visible spectrophotometry showed that the transmittance of the samples is around 75% in visible with an optical band gap varying from 3.23 to 3.36 eV when the content of Al doping increases from 0 to 5 at.%. Analysis by (M-Lines) helped us to extract approximate values for the refractive index of these layers, which is between 1.83 and 1.97, and thicknesses very close from those estimated by the RBS analysis, as well as the possibility of using the layers in the field of the optical waveguide. In addition to these results, the electrical measurements by (Hall Effect) have shown that all the layers prepared in this study are n-type semiconductor, and that, the aluminum doping increases the concentration of charge carriers and reduces resistance.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/KER6718.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9905 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité KER/6718 KER/6718 Thèse Bibliothèque principale Thèses Disponible
Titre : Elaboration et étude des couches minces d’oxyde d’étain Type de document : texte imprimé Auteurs : Mourad Khechba, Auteur ; Abderaheman Bouabellou, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 97 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Couche mince SnO2 dopage Sol-Gel DRX AFM Spectroscopie Raman UV-Vis Ellipsométrie spectroscopique (SE) Thin films doping Raman spectroscopy UV-Visible Ellipsometry Spectroscopic الشرائح الرقيقة أكسيد القصدير التطعيم-سائل-جامد حيود الاشعة السينية مجهر القوة الذرية مطيافية رامان مطيافية الاشعة فوق البنفسجية والمرئية والمطياف الاهليجي Index. décimale : 530 Physique Résumé : This work is devoted to the development of the tin oxide thin films by the sol-gel method. The effect of the annealing temperature, the number of layers and the doping on the structural and optical properties of the films obtained were investigated. The obtained films are characterized by X-ray diffraction (DRX), RAMAN spectroscopy, atomic force microscopy (AFM), UV-Visible spectroscopy and ellipsometry spectroscopic. Raman spectroscopy results show that the SnO2 thin films are crystallizes in rutile phase. A good crystallization is observed after 3 coats. The results of optical characterization show that all the films are transparent (75 to 85% optical transmittance) in the visible and The energy band gap of all the samples lies in the range of 3.63eV– 3.89eV With regard to doping, undoped and doped tin oxide thin films (SnO2:Cd, SnO2:Al) were deposited by Sol Gel Dip Coating method on glass and silicon Si(100) substrates. The DRX shows that all the films deposited on glass substrates have an amorphous structure. On the other hand, the films deposited on Si (100) substrate crystallize in the rutile phase, with a preferential orientation along the axis (310). AFM observations of the surface show that the doping rate affects the roughness. The grain size and the roughness of the samples decrease with the increase of the doping concentration. The SnO2, SnO2:Cd and SnO2:Al thin films are transparent in the visible region and opaque in the ultraviolet region. The band gap, determined from the transmission spectra for the deposited films, also decreases with the increase in the doping rate (from 06 to 10% Cd, and from 04 to 06% Al). In addition, the increase of the cadmium and aluminum doping concentration causes a slight increase in the refractive index.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/KHE7337.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10987 Elaboration et étude des couches minces d’oxyde d’étain [texte imprimé] / Mourad Khechba, Auteur ; Abderaheman Bouabellou, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 97 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Couche mince SnO2 dopage Sol-Gel DRX AFM Spectroscopie Raman UV-Vis Ellipsométrie spectroscopique (SE) Thin films doping Raman spectroscopy UV-Visible Ellipsometry Spectroscopic الشرائح الرقيقة أكسيد القصدير التطعيم-سائل-جامد حيود الاشعة السينية مجهر القوة الذرية مطيافية رامان مطيافية الاشعة فوق البنفسجية والمرئية والمطياف الاهليجي Index. décimale : 530 Physique Résumé : This work is devoted to the development of the tin oxide thin films by the sol-gel method. The effect of the annealing temperature, the number of layers and the doping on the structural and optical properties of the films obtained were investigated. The obtained films are characterized by X-ray diffraction (DRX), RAMAN spectroscopy, atomic force microscopy (AFM), UV-Visible spectroscopy and ellipsometry spectroscopic. Raman spectroscopy results show that the SnO2 thin films are crystallizes in rutile phase. A good crystallization is observed after 3 coats. The results of optical characterization show that all the films are transparent (75 to 85% optical transmittance) in the visible and The energy band gap of all the samples lies in the range of 3.63eV– 3.89eV With regard to doping, undoped and doped tin oxide thin films (SnO2:Cd, SnO2:Al) were deposited by Sol Gel Dip Coating method on glass and silicon Si(100) substrates. The DRX shows that all the films deposited on glass substrates have an amorphous structure. On the other hand, the films deposited on Si (100) substrate crystallize in the rutile phase, with a preferential orientation along the axis (310). AFM observations of the surface show that the doping rate affects the roughness. The grain size and the roughness of the samples decrease with the increase of the doping concentration. The SnO2, SnO2:Cd and SnO2:Al thin films are transparent in the visible region and opaque in the ultraviolet region. The band gap, determined from the transmission spectra for the deposited films, also decreases with the increase in the doping rate (from 06 to 10% Cd, and from 04 to 06% Al). In addition, the increase of the cadmium and aluminum doping concentration causes a slight increase in the refractive index.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/KHE7337.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10987 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité KHE/7337 KHE/7337 Thèse Bibliothèque principale Thèses Disponible
Titre : Elaboration et étude des couches minces photo-catalytiques à base de TiO2-Fe2o3 Type de document : texte imprimé Auteurs : Djamel Eddine Guitoum ; Univ. de Constantine, Éditeur scientifique ; S. Achour, Directeur de thèse Année de publication : 2008 Importance : 61 f. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Pulvérisation Couche mince Propriétés optiques Propriétés structurales TiO2-FeO3 .TiO2 Oxydation thermique Index. décimale : 530 Physique En ligne : ../theses/physique/GUI5171.pdf Permalink : index.php?lvl=notice_display&id=3470 Elaboration et étude des couches minces photo-catalytiques à base de TiO2-Fe2o3 [texte imprimé] / Djamel Eddine Guitoum ; Univ. de Constantine, Éditeur scientifique ; S. Achour, Directeur de thèse . - 2008 . - 61 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Pulvérisation Couche mince Propriétés optiques Propriétés structurales TiO2-FeO3 .TiO2 Oxydation thermique Index. décimale : 530 Physique En ligne : ../theses/physique/GUI5171.pdf Permalink : index.php?lvl=notice_display&id=3470 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité GUI/5171 GUI/5171 Thèse Bibliothèque principale Thèses Disponible
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