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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) Catégories : Français - Anglais
PhysiqueTags : couches minces CuO spray pyrolyse cellules solaire capteur à gaz thin films spray pyrolysis solar cells gas sensor شرائح رقيقة, CuOالرش الحرارى الخلايا الشمسية مجس الغازات 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 . - جامعة الإخوة منتوري قسنطينة, 2016 . - 225 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Anglais (eng)
Catégories : Français - Anglais
PhysiqueTags : couches minces CuO spray pyrolyse cellules solaire capteur à gaz thin films spray pyrolysis solar cells gas sensor شرائح رقيقة, CuOالرش الحرارى الخلايا الشمسية مجس الغازات 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 (1)
Code-barres Cote Support Localisation Section Disponibilité LAM/6909 LAM/6909 Thèse Bibliothèque principale Thèses Disponible
Titre : Élaboration et caractérisation de couches minces à base d’oxydes. Type de document : texte imprimé Auteurs : Hacène Serrar, Auteur ; Abderaheman Bouabellou, Directeur de thèse Mention d'édition : 06/11/2019 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 120 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : physique: Sciences des matériaux Oxyde métallique couches minces CuO TiO2 spray pyrolyse sol-gel guidage optique photocatalyse Metallic oxide thin films pyrolysis spray optical guiding photocatalysis أكسید معدني طبقات رقیقة أكسید النحاس أكسید التیتان الرش و الانحلال الحراري الترسیب سائل -
جامد التوجیه البصري التحفیز الضوئیIndex. décimale : 530 Physique Résumé : In this work, we are interested in the study of thin films based on metal oxides elaborated by two chemical methods namely the pyrolysis spray and the sol-gel dip - coating. Our study is first focused on the effect of solvent on the properties of thin CuO films. Thin CuO films were prepared by the pyrolysis spray method using two different solvents: water and methanol. The structural, microstructural, morphological and optical characterizations of CuO thin films were carried out. The crystalline structure analysis using the XRD diffraction technique shows three characteristic peaks (002), (111) and (020) of the monoclinic CuO phase. The position of the peaks are shifted to the lowest angles, indicating the effect of tensile stress in the prepared films. The micro-Raman analysis confirms the results of XRD. The SEM observation shows that the morphology of the film strongly depends on the nature of the used solvent. The optical characterization of CuO- (distilled
water) sample shows a low transmittance compared to that prepared with methanol. This behavior is attributed to the simultaneous effects of thickness and solvent. Then, our study has been focused on the effect of experimental parameters and the addition of metal oxides (ZnO and NiO) on the properties of TiO2 thin films prepared by the sol-gel method. The structural characterization by means of micro-Raman spectroscopy shows vibration modes corresponding to the anatase phase of TiO2. Thin TiO2films and its compounds are characterized by micro-Raman, SEM, m-lines and Uvvisible techniques. Micro-Raman analysis shows that the TiO2 thin films are characterized by the modes of vibration of the Anatase phase. ZnO and NiO cause the decay of TiO2 vibration modes. The SEM observation shows that the addition of ZnO pushes the crystalline degradation (amorphization) of the TiO2 anatase phase. While UV.Vis analysis shows an increase in the optical gap due to the effect of amorphization and Burstein-Moss. The waveguide measurements reveal simple guided modes in both polarizations (TE0 and TM0) in all samples from which the refractive index and the thickness are calculated. A decreasing refractive index profile was observed when ZnO and NiO are introduced into thin films of pure TiO2. The photocatalytic activity is evaluated by the degradation of MB. The obtained results show that the thin films of pure TiO2 are the best
photocatalytic materials.
Note de contenu : Liste des publications.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/SER7582.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11419 Élaboration et caractérisation de couches minces à base d’oxydes. [texte imprimé] / Hacène Serrar, Auteur ; Abderaheman Bouabellou, Directeur de thèse . - 06/11/2019 . - جامعة الإخوة منتوري قسنطينة, 2019 . - 120 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : physique: Sciences des matériaux Oxyde métallique couches minces CuO TiO2 spray pyrolyse sol-gel guidage optique photocatalyse Metallic oxide thin films pyrolysis spray optical guiding photocatalysis أكسید معدني طبقات رقیقة أكسید النحاس أكسید التیتان الرش و الانحلال الحراري الترسیب سائل -
جامد التوجیه البصري التحفیز الضوئیIndex. décimale : 530 Physique Résumé : In this work, we are interested in the study of thin films based on metal oxides elaborated by two chemical methods namely the pyrolysis spray and the sol-gel dip - coating. Our study is first focused on the effect of solvent on the properties of thin CuO films. Thin CuO films were prepared by the pyrolysis spray method using two different solvents: water and methanol. The structural, microstructural, morphological and optical characterizations of CuO thin films were carried out. The crystalline structure analysis using the XRD diffraction technique shows three characteristic peaks (002), (111) and (020) of the monoclinic CuO phase. The position of the peaks are shifted to the lowest angles, indicating the effect of tensile stress in the prepared films. The micro-Raman analysis confirms the results of XRD. The SEM observation shows that the morphology of the film strongly depends on the nature of the used solvent. The optical characterization of CuO- (distilled
water) sample shows a low transmittance compared to that prepared with methanol. This behavior is attributed to the simultaneous effects of thickness and solvent. Then, our study has been focused on the effect of experimental parameters and the addition of metal oxides (ZnO and NiO) on the properties of TiO2 thin films prepared by the sol-gel method. The structural characterization by means of micro-Raman spectroscopy shows vibration modes corresponding to the anatase phase of TiO2. Thin TiO2films and its compounds are characterized by micro-Raman, SEM, m-lines and Uvvisible techniques. Micro-Raman analysis shows that the TiO2 thin films are characterized by the modes of vibration of the Anatase phase. ZnO and NiO cause the decay of TiO2 vibration modes. The SEM observation shows that the addition of ZnO pushes the crystalline degradation (amorphization) of the TiO2 anatase phase. While UV.Vis analysis shows an increase in the optical gap due to the effect of amorphization and Burstein-Moss. The waveguide measurements reveal simple guided modes in both polarizations (TE0 and TM0) in all samples from which the refractive index and the thickness are calculated. A decreasing refractive index profile was observed when ZnO and NiO are introduced into thin films of pure TiO2. The photocatalytic activity is evaluated by the degradation of MB. The obtained results show that the thin films of pure TiO2 are the best
photocatalytic materials.
Note de contenu : Liste des publications.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/SER7582.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11419 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité SER/7582 SER/7582 Thèse Bibliothèque principale Thèses Disponible 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) Catégories : Français - Anglais
PhysiqueTags : Cu2ZnSnS4 Hétérojonctions Spray pyrolyse Cellules photovoltaïques Heterojunctions Spray pyrolysis Solar cells الرش فوق الصوتي الخلايا الكهروضوئية الوصلتين 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 . - جامعة الإخوة منتوري قسنطينة, 2017 . - 128 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Cu2ZnSnS4 Hétérojonctions Spray pyrolyse Cellules photovoltaïques Heterojunctions Spray pyrolysis Solar cells الرش فوق الصوتي الخلايا الكهروضوئية الوصلتين 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 (1)
Code-barres Cote Support Localisation Section Disponibilité GUI/7011 GUI/7011 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude des propriétés de couches minces d'oxydes métalliques pour applications dans le domaine biomédical : détection de gaz toxiques. Type de document : texte imprimé Auteurs : Bouteina Bendahmane, Auteur ; Farida Mansour, Directeur de thèse ; Nour El Houda Touidjen, Directeur de thèse Mention d'édition : 23/09/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 128 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Electonique: Procédés et dispositifs pour le biomédical spray pyrolyse couches minces dioxyde d’étain recuit thermique dopage détection des gaz toxiques spray pyrolysis thin films tin dioxide thermal annealing doping detection of toxic gases رذاذ الانحلال الحراري الطبقات الرقيقة ثاني أكسيد القصدير المعالجة الحرارية ، التنشيط الكشف عن الغازات السامة Index. décimale : 621 Electronique Résumé :
In this dissertation, we used chemical spray pyrolysis method for the growth of pristine, annealed, and magnesium (Mg) doped tin dioxide (SnO2) thin films, for their application in the detection of toxic gases. The synthesis of tin dioxide thin films, their characterizations as well as their gas sensing performances have been investigated. The spray pyrolysis method has proved its compatibility and its suitability for growing pristine and doped thin films within a single step deposition process at moderate temperatures (≤ 400°C). Furthermore, various analyzing techniques have been used to examine the structure, morphology, and composition
of the synthesized films. The results showed that thermal annealing at 450°C improved the crystallinity and homogeneity of the Mg-doped SnO2 films. The gas sensing characteristics in the presence of toxic gases, showed that the increase of the Mg doping level up to 1.6 at.% within the SnO2 films has improved their responses, their sensitivities, as well as their partial selectivities mainly towards ethanol (the response is almost fourteen times higher). Thus, we were able to propose an explanatory model for the interaction of the sensitive layers surface with gas molecules. The latter is based on the defects introduced in the films, the subsequent decrease in the crystallites’ size and the formation of different phase that led to the improvement
of the interaction between the adsorbed oxygen species and the target gas molecules.
Diplôme : Doctorat En ligne : ../theses/electronique/BEN7803.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11635 Etude des propriétés de couches minces d'oxydes métalliques pour applications dans le domaine biomédical : détection de gaz toxiques. [texte imprimé] / Bouteina Bendahmane, Auteur ; Farida Mansour, Directeur de thèse ; Nour El Houda Touidjen, Directeur de thèse . - 23/09/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 128 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Electonique: Procédés et dispositifs pour le biomédical spray pyrolyse couches minces dioxyde d’étain recuit thermique dopage détection des gaz toxiques spray pyrolysis thin films tin dioxide thermal annealing doping detection of toxic gases رذاذ الانحلال الحراري الطبقات الرقيقة ثاني أكسيد القصدير المعالجة الحرارية ، التنشيط الكشف عن الغازات السامة Index. décimale : 621 Electronique Résumé :
In this dissertation, we used chemical spray pyrolysis method for the growth of pristine, annealed, and magnesium (Mg) doped tin dioxide (SnO2) thin films, for their application in the detection of toxic gases. The synthesis of tin dioxide thin films, their characterizations as well as their gas sensing performances have been investigated. The spray pyrolysis method has proved its compatibility and its suitability for growing pristine and doped thin films within a single step deposition process at moderate temperatures (≤ 400°C). Furthermore, various analyzing techniques have been used to examine the structure, morphology, and composition
of the synthesized films. The results showed that thermal annealing at 450°C improved the crystallinity and homogeneity of the Mg-doped SnO2 films. The gas sensing characteristics in the presence of toxic gases, showed that the increase of the Mg doping level up to 1.6 at.% within the SnO2 films has improved their responses, their sensitivities, as well as their partial selectivities mainly towards ethanol (the response is almost fourteen times higher). Thus, we were able to propose an explanatory model for the interaction of the sensitive layers surface with gas molecules. The latter is based on the defects introduced in the films, the subsequent decrease in the crystallites’ size and the formation of different phase that led to the improvement
of the interaction between the adsorbed oxygen species and the target gas molecules.
Diplôme : Doctorat En ligne : ../theses/electronique/BEN7803.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11635 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEN/7803 BEN/7803 Thèse Bibliothèque principale Thèses Disponible
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) Catégories : Français - Anglais
PhysiqueTags : couches minces CZTS spray pyrolyse hétérojonction cellules solaire thin films spray pyrolysis hetero-junction solar cells شرائح رقيقة CZTSالرش الحرارى وصلة غير متجانسة الخلايا الشمسية 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 . - جامعة الإخوة منتوري قسنطينة, 2018 . - 173 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Anglais (eng)
Catégories : Français - Anglais
PhysiqueTags : couches minces CZTS spray pyrolyse hétérojonction cellules solaire thin films spray pyrolysis hetero-junction solar cells شرائح رقيقة CZTSالرش الحرارى وصلة غير متجانسة الخلايا الشمسية 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 (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7355 BOU/7355 Thèse Bibliothèque principale Thèses Disponible
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