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Titre : Cupric Oxide thin films deposition for gas sensor application Type de document : texte imprimé Auteurs : Meryem Lamri Zeggar, Auteur ; Mohamed Salah Aida, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 225 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Anglais (eng) Tags : couches minces CuO spray pyrolyse cellules solaire capteur à gaz thin films spray pyrolysis solar cells gas sensor ????? ?????, CuO???? ??????? ??????? ??????? ??? ??????? Index. décimale : 530 Physique Résumé :
The present work deals with the deposition of CuO thin films by a simple and cheap
technique such as Spray ultrasonic pyrolysis (SP). In the first, a set of CuO thin film was prepared using various deposition conditions in order to optimize the technique and prepare suitable films devoted to the photovoltaic and sensing applications. The studied deposition parameters were the substrate temperature, flow rate, salt nature and concentration. The structural analysis shows that the obtained films are polycrystalline, they exhibit a monoclinic structure. The preferential orientation is strongly related to the experimental parameters studies. From the optical and electrical characterization results, we inferred that the deposited films have suitable optoelectronic properties for the photovoltaic applications since they present a good absorption in the visible range. The fabricated CuO based sensor show a very high sensitivity equivalent to 90% at lower operation temperature equal to 50°C towards 300 ppm of methanol vapor. The sensing layer exhibits response and recovery times of 2,45 min and 2,02 min respectively with limit detection equal to 20 ppm. For ethanol sensing, the CuO based gas sensor show a sensitivity equal to 45% towards 300 ppm concentration of ethanol at operation temperature equal to 150°C. Response and recovery times are 2,98 min and 2,11 min respectively with limit detection at 25 ppm. The fabricated CuO based gas sensor show also a relative gas response equal to 9% at lower operation temperature above 60°C for CO2 pressure at 5hPa. The response and recovery times are ranged from 29 to 41 s and 30 to 35 s respectively occurring increases in sensitivity from 4.67 to 13.46 % when varying the CO2 pressure from 2 to 20 hPa. The obtained solar cells devices for CuO/ZnO and CuO/ZnS have low efficiencies equal to 5.2 x 10-4 and 7 x 10-4 %, respectively.Diplôme : Doctorat En ligne : ../theses/physique/LAM6909.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10244 Cupric Oxide thin films deposition for gas sensor application [texte imprimé] / Meryem Lamri Zeggar, Auteur ; Mohamed Salah Aida, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2016 . - 225 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Anglais (eng)
Tags : couches minces CuO spray pyrolyse cellules solaire capteur à gaz thin films spray pyrolysis solar cells gas sensor ????? ?????, CuO???? ??????? ??????? ??????? ??? ??????? Index. décimale : 530 Physique Résumé :
The present work deals with the deposition of CuO thin films by a simple and cheap
technique such as Spray ultrasonic pyrolysis (SP). In the first, a set of CuO thin film was prepared using various deposition conditions in order to optimize the technique and prepare suitable films devoted to the photovoltaic and sensing applications. The studied deposition parameters were the substrate temperature, flow rate, salt nature and concentration. The structural analysis shows that the obtained films are polycrystalline, they exhibit a monoclinic structure. The preferential orientation is strongly related to the experimental parameters studies. From the optical and electrical characterization results, we inferred that the deposited films have suitable optoelectronic properties for the photovoltaic applications since they present a good absorption in the visible range. The fabricated CuO based sensor show a very high sensitivity equivalent to 90% at lower operation temperature equal to 50°C towards 300 ppm of methanol vapor. The sensing layer exhibits response and recovery times of 2,45 min and 2,02 min respectively with limit detection equal to 20 ppm. For ethanol sensing, the CuO based gas sensor show a sensitivity equal to 45% towards 300 ppm concentration of ethanol at operation temperature equal to 150°C. Response and recovery times are 2,98 min and 2,11 min respectively with limit detection at 25 ppm. The fabricated CuO based gas sensor show also a relative gas response equal to 9% at lower operation temperature above 60°C for CO2 pressure at 5hPa. The response and recovery times are ranged from 29 to 41 s and 30 to 35 s respectively occurring increases in sensitivity from 4.67 to 13.46 % when varying the CO2 pressure from 2 to 20 hPa. The obtained solar cells devices for CuO/ZnO and CuO/ZnS have low efficiencies equal to 5.2 x 10-4 and 7 x 10-4 %, respectively.Diplôme : Doctorat En ligne : ../theses/physique/LAM6909.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10244 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Elaboration et étude de structures à base de couches minces de ZnO et de chalcogénures (CIS, CZTS) pour des applications photovoltaïques / Samira Guitouni
Titre : Elaboration et étude de structures à base de couches minces de ZnO et de chalcogénures (CIS, CZTS) pour des applications photovoltaïques Type de document : texte imprimé Auteurs : Samira Guitouni, Auteur ; Nadhir Attaf, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 128 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Cu2ZnSnS4 Hétérojonctions Spray pyrolyse Cellules photovoltaïques Heterojunctions Spray pyrolysis Solar cells ???? ??? ?????? ??????? ??????????? ???????? Index. décimale : 530 Physique Résumé : Among the most promising quaternary semiconductors for thin film solar cells fabrication is the Cu2ZnSnS4 (CZTS) material. Our choice in this thesis, to elaborate the CZTS thin films was related to the spray pyrolysis method. This choice was based on low cost thin film process deposition with material properties satisfying the photovoltaic criteria.
The effect of some experimental parameters on the properties of layers was studied, such as, the copper concentration, deposition time, the temperature of the substrate and the doping by Au nanoparticles. After preparation, films were subjected to a various characterizations structural, morphological, optical and electrical. The structural characterization present the Cu2ZnSnS4 under its kësterite structure showing a high degree of preferred orientation towards the (112) direction and for a copper concentration of 0.010M, indicating that the film has a single dominant phase CZTS. The optical gap values vary from 1.2 to 1.69 eV suggesting that CZTS thin films can be a good candidate as absorber layer for thin films solar cells. The resulting films of the copper concentration 0.010M are rich in Zn and poor in Cu. This composition is desired to improve the efficiency of solar cells based on CZTS. In other hand, the films doped with Au
nanoparticles reduces the formation of secondary phases, increases the conductivity of the layer and improved the values of the optical gap for use in solar cells.
I-V characteristics of heterostructures CZTS/CdS/FTO and CZTS/ZnS/FTO made from films prepared according to the studied experimental conditions. The results show relatively low values of characteristics: short circuit current density, open circuit voltage and efficiency. The results are caused by the influence of several parameters, the high values of resistance series, saturation current and the interface states. From the thermal activation energy of the saturation current we deduced that the reverse current is controlled by thermal emission through the barrier height rather than by tunneling through the defects localized in the band gap. The Au/CZTS/CdS/FTO heterojunction exhibits a photovoltaic effect but with a poor efficiency (0.26%).
Diplôme : Doctorat en sciences En ligne : ../theses/physique/GUI7011.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10388 Elaboration et étude de structures à base de couches minces de ZnO et de chalcogénures (CIS, CZTS) pour des applications photovoltaïques [texte imprimé] / Samira Guitouni, Auteur ; Nadhir Attaf, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 128 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Cu2ZnSnS4 Hétérojonctions Spray pyrolyse Cellules photovoltaïques Heterojunctions Spray pyrolysis Solar cells ???? ??? ?????? ??????? ??????????? ???????? Index. décimale : 530 Physique Résumé : Among the most promising quaternary semiconductors for thin film solar cells fabrication is the Cu2ZnSnS4 (CZTS) material. Our choice in this thesis, to elaborate the CZTS thin films was related to the spray pyrolysis method. This choice was based on low cost thin film process deposition with material properties satisfying the photovoltaic criteria.
The effect of some experimental parameters on the properties of layers was studied, such as, the copper concentration, deposition time, the temperature of the substrate and the doping by Au nanoparticles. After preparation, films were subjected to a various characterizations structural, morphological, optical and electrical. The structural characterization present the Cu2ZnSnS4 under its kësterite structure showing a high degree of preferred orientation towards the (112) direction and for a copper concentration of 0.010M, indicating that the film has a single dominant phase CZTS. The optical gap values vary from 1.2 to 1.69 eV suggesting that CZTS thin films can be a good candidate as absorber layer for thin films solar cells. The resulting films of the copper concentration 0.010M are rich in Zn and poor in Cu. This composition is desired to improve the efficiency of solar cells based on CZTS. In other hand, the films doped with Au
nanoparticles reduces the formation of secondary phases, increases the conductivity of the layer and improved the values of the optical gap for use in solar cells.
I-V characteristics of heterostructures CZTS/CdS/FTO and CZTS/ZnS/FTO made from films prepared according to the studied experimental conditions. The results show relatively low values of characteristics: short circuit current density, open circuit voltage and efficiency. The results are caused by the influence of several parameters, the high values of resistance series, saturation current and the interface states. From the thermal activation energy of the saturation current we deduced that the reverse current is controlled by thermal emission through the barrier height rather than by tunneling through the defects localized in the band gap. The Au/CZTS/CdS/FTO heterojunction exhibits a photovoltaic effect but with a poor efficiency (0.26%).
Diplôme : Doctorat en sciences En ligne : ../theses/physique/GUI7011.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10388 Exemplaires
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Titre : Realization and electrical characterization of thin film heterojunction for photovoltaic application. Type de document : texte imprimé Auteurs : Fatima Zohra Boutebakh, Auteur ; Nadhir Attaf, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 173 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Anglais (eng) Tags : couches minces CZTS spray pyrolyse hétérojonction cellules solaire thin films spray pyrolysis hetero-junction solar cells ????? ????? CZTS???? ??????? ???? ??? ??????? ??????? ??????? Index. décimale : 530 Physique Résumé : The present work deals with the deposition of CZTS thin films and related devices by a simple and cheap technique such as Spray Pyrolysis (SP). For this purpose, a set of CZTS thin film was prepared using various deposition conditions in order to optimize the deposition conditions allow us to prepare suitable films devoted to the photovoltaic applications. The studied deposition parameters were the substrate temperature, deposition time, and copper and zinc salt concentrations. The structural analysis shows that the obtained films are polycrystalline; they exhibit a tetragonal structure with a preferential orientation along (112). However, the structural properties and secondary phases were affected by the deposition conditions. From the optical and electrical characterization results, we inferred that the deposited films have suitable optoelectronic properties for the photovoltaic applications, since they present a good absorption in the visible range coupled with a higher conductivity. Finally; the fabricated CZTS heterojunction with various back contacts show a rectification behavior, the G-f characterization reveals the presence of interface state at CZTS/ZnS interface with a state density in the order of 1010 eV-1cm-2. The addition of ZnO intrinsic layer enhances the heterojunction device properties. Whereas, the solar cells based CZTS/CdS annealed at 450 °C under H2S gas show the best solar cell efficiency about 0.43 % and a current density equal 9.8 mA/cm2.
Diplôme : Doctorat En ligne : ../theses/physique/BOU7355.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11004 Realization and electrical characterization of thin film heterojunction for photovoltaic application. [texte imprimé] / Fatima Zohra Boutebakh, Auteur ; Nadhir Attaf, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 173 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Anglais (eng)
Tags : couches minces CZTS spray pyrolyse hétérojonction cellules solaire thin films spray pyrolysis hetero-junction solar cells ????? ????? CZTS???? ??????? ???? ??? ??????? ??????? ??????? Index. décimale : 530 Physique Résumé : The present work deals with the deposition of CZTS thin films and related devices by a simple and cheap technique such as Spray Pyrolysis (SP). For this purpose, a set of CZTS thin film was prepared using various deposition conditions in order to optimize the deposition conditions allow us to prepare suitable films devoted to the photovoltaic applications. The studied deposition parameters were the substrate temperature, deposition time, and copper and zinc salt concentrations. The structural analysis shows that the obtained films are polycrystalline; they exhibit a tetragonal structure with a preferential orientation along (112). However, the structural properties and secondary phases were affected by the deposition conditions. From the optical and electrical characterization results, we inferred that the deposited films have suitable optoelectronic properties for the photovoltaic applications, since they present a good absorption in the visible range coupled with a higher conductivity. Finally; the fabricated CZTS heterojunction with various back contacts show a rectification behavior, the G-f characterization reveals the presence of interface state at CZTS/ZnS interface with a state density in the order of 1010 eV-1cm-2. The addition of ZnO intrinsic layer enhances the heterojunction device properties. Whereas, the solar cells based CZTS/CdS annealed at 450 °C under H2S gas show the best solar cell efficiency about 0.43 % and a current density equal 9.8 mA/cm2.
Diplôme : Doctorat En ligne : ../theses/physique/BOU7355.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11004 Exemplaires
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Titre : Corrélation entre les propriétés thermophysiques des gouttelettes et les propriétés des couches minces déposées par le procédé spray Type de document : texte imprimé Auteurs : Samira Guitouni ; Université Mentouri, Editeur scientifique ; N. Attaf, Directeur de thèse Année de publication : 2010 Importance : 115 f. Note générale : 01 Disponible à la salle de recherche 01 Disponible au magazin de la B.U.C. 01 CD Langues : Français (fre) Tags : Viscosité Spray pyrolyse Couche mince ZnO Tension superficielle Energie de dissociation Goutte impactant Index. décimale : 530 Physique En ligne : ../theses/physique/GUI5867.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3627 Corrélation entre les propriétés thermophysiques des gouttelettes et les propriétés des couches minces déposées par le procédé spray [texte imprimé] / Samira Guitouni ; Université Mentouri, Editeur scientifique ; N. Attaf, Directeur de thèse . - 2010 . - 115 f.
01 Disponible à la salle de recherche 01 Disponible au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Tags : Viscosité Spray pyrolyse Couche mince ZnO Tension superficielle Energie de dissociation Goutte impactant Index. décimale : 530 Physique En ligne : ../theses/physique/GUI5867.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3627 Exemplaires
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