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Auteur Nadhir Attaf |
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Titre : Déposition et étude des couches pérovskites pour le photovoltaïque. Type de document : texte imprimé Auteurs : Itidel Belaidi, Auteur ; Nadhir Attaf, Directeur de thèse ; Fatima Khelfaoui, Directeur de thèse Mention d'édition : 07/07/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 175 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : pérovskites organiques-inorganiques cellules solaires photovoltaïque hétérojonction perovskite organic-inorganic photovoltaic heterojunction البيروفسكايت الخلايا العضوية غير العضوية الخلايا الشمسية الخلايا الكهروضوئية غير المتجانسة Index. décimale : 530 Physique Résumé :
In recent years, hybrid organic-inorganic perovskites have emerged as a new class of semiconductors with very interesting optoelectronic properties for photovoltaic devices. This thesis focuses on the deposition of CH3NH3PbI3 perovskite materials by spin-coating on glass substrates. The effects of the nature of the solvent and the speed of rotation on the morphology of the films and the structure are studied. Two solvents are used:N, N-dimethylformamide (DMF) and a mixture of dimethylsulfoxide (DMSO) with DMF. The rotation speed varies between 700 and 2000 rpm.Scanning electron microscopy (SEM) observations indicate that the films prepared are not continuous with varying morphologies; the films are formed of elongated fibers. The structural characterization of the films revealed that the latter have a tetragonal structure of the prepared perovskite with a preferential orientation towards (110). The optical and electrical characterizations have shown that the CH3NH3PbI3 films deposited by spin coating have good optoelectronic properties. good absorbance in the visible range with an optical gap equal to1.54eV. The electrical characterizations have shown that the CH3NH3PbI3 films prepared are resistive; the thin layers of CH3NH3PbI3 turn out to be very sensitive to several factors: humidity, oxygen, light irradiation, On the other hand, the study of the heterojunction was made by the IV and CV techniques which made it possible to determine the electrical parameters heterojunction.
Note de contenu : Annexes. Diplôme : Doctorat En ligne : ../theses/physique/BEL7831.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11663 Déposition et étude des couches pérovskites pour le photovoltaïque. [texte imprimé] / Itidel Belaidi, Auteur ; Nadhir Attaf, Directeur de thèse ; Fatima Khelfaoui, Directeur de thèse . - 07/07/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 175 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : pérovskites organiques-inorganiques cellules solaires photovoltaïque hétérojonction perovskite organic-inorganic photovoltaic heterojunction البيروفسكايت الخلايا العضوية غير العضوية الخلايا الشمسية الخلايا الكهروضوئية غير المتجانسة Index. décimale : 530 Physique Résumé :
In recent years, hybrid organic-inorganic perovskites have emerged as a new class of semiconductors with very interesting optoelectronic properties for photovoltaic devices. This thesis focuses on the deposition of CH3NH3PbI3 perovskite materials by spin-coating on glass substrates. The effects of the nature of the solvent and the speed of rotation on the morphology of the films and the structure are studied. Two solvents are used:N, N-dimethylformamide (DMF) and a mixture of dimethylsulfoxide (DMSO) with DMF. The rotation speed varies between 700 and 2000 rpm.Scanning electron microscopy (SEM) observations indicate that the films prepared are not continuous with varying morphologies; the films are formed of elongated fibers. The structural characterization of the films revealed that the latter have a tetragonal structure of the prepared perovskite with a preferential orientation towards (110). The optical and electrical characterizations have shown that the CH3NH3PbI3 films deposited by spin coating have good optoelectronic properties. good absorbance in the visible range with an optical gap equal to1.54eV. The electrical characterizations have shown that the CH3NH3PbI3 films prepared are resistive; the thin layers of CH3NH3PbI3 turn out to be very sensitive to several factors: humidity, oxygen, light irradiation, On the other hand, the study of the heterojunction was made by the IV and CV techniques which made it possible to determine the electrical parameters heterojunction.
Note de contenu : Annexes. Diplôme : Doctorat En ligne : ../theses/physique/BEL7831.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11663 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEL/7831 BEL/7831 Thèse Bibliothèque principale Thèses Disponible
Titre : Deposition of ZnO thin films for treatment of water. Type de document : texte imprimé Auteurs : Fouzia Bourfa, Auteur ; Nadhir Attaf, Directeur de thèse Mention d'édition : 27/12/2020 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2020 Importance : 199 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Anglais (eng) Catégories : Français - Anglais
PhysiqueTags : physique:Sciences des matériaux Materials science: Semi-conductor Oxyde de Zinc Couches minces Nanostructuré Photocatalyse Activité antibactérienne Cellules solaires Zinc Oxide Thin films Nanostructured Photocatalysis Antibacterial activity Solar cells أكسيد الزنك الأغشية الرقيقة البنيةالنانوية التحفيز الضوئي النشاط المضاد للبكتيريا الخلايا الشمسية Index. décimale : 530 Physique Résumé :
The semiconductor heterogeneous photocatalytic technique is a kind of green technology that has been used to solve environmental pollution problems. The present study focuses on the screening of potentially photocatalytic ZnO thin films and nanostructures by using them to degrade organic dyes. Primarily Zinc chloride, nitrate and acetate salts were tested for their photocatalytic activity through the degradation of Red reactive and Methylene Blue (MB) in aqueous solution. The select compounds which are deposited by spray pyrolysis show considerable photodegradation efficiency. The studied different parameters such as concentration of dye, time deposition, salt source and seed layer position have a great effect on the photodegradation of this dye. Hydrothermal ZnO nanostructured were also tested for decolorization of MB and the results are very encourage especially for ZnO Nanorods (acetate salt) and ZnO nanoflowers for water treatment and gas sensing. Undoped and ZnO: Ag NPs films on glass and tissue, which prepared by sol-gel, show the capability of zinc oxide and silver nanoparticles to resist the growth of Gram – of K. pneumonia and E. coli by their inhibition zone which reaches 23 mm. Zinc nitrate as a precursor was used to prepare the Al/ ZnO/p-Si heterojunction by ultrasonic spray in order to investigate the photovoltaic parameters of the solar cell of this device. The I-V measurements indicate that the ideality factor n is 1.39 and the barrier height ϕb is 0.67 eV. The ϕb from I-V measurement and Norde’s function (0.69 eV) are in well agreement. While the series resistance Rs obtained from Norde’s function is found 1194 Ω. The diode has a good rectification property,photovoltaic behavior, photosensing and photoresponsivity properties. The electrical and photoelectric characterization confirms that this device is a very suitable candidate as a photodiode, photosensor applications and optoelectronic applications. The ISC and VOC were varied 11.12- 50.73 µA and 125.33- 185.22 mV for various illuminations. The C-V analysis shows that capacitance and conductance of the Al/ZnO/ p-Si diode depends on voltage and frequency. The Na, ϕb and Vbi of this structure are increased with the increasing frequencies.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BOU7776.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11610 Deposition of ZnO thin films for treatment of water. [texte imprimé] / Fouzia Bourfa, Auteur ; Nadhir Attaf, Directeur de thèse . - 27/12/2020 . - جامعة الإخوة منتوري قسنطينة, 2020 . - 199 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Anglais (eng)
Catégories : Français - Anglais
PhysiqueTags : physique:Sciences des matériaux Materials science: Semi-conductor Oxyde de Zinc Couches minces Nanostructuré Photocatalyse Activité antibactérienne Cellules solaires Zinc Oxide Thin films Nanostructured Photocatalysis Antibacterial activity Solar cells أكسيد الزنك الأغشية الرقيقة البنيةالنانوية التحفيز الضوئي النشاط المضاد للبكتيريا الخلايا الشمسية Index. décimale : 530 Physique Résumé :
The semiconductor heterogeneous photocatalytic technique is a kind of green technology that has been used to solve environmental pollution problems. The present study focuses on the screening of potentially photocatalytic ZnO thin films and nanostructures by using them to degrade organic dyes. Primarily Zinc chloride, nitrate and acetate salts were tested for their photocatalytic activity through the degradation of Red reactive and Methylene Blue (MB) in aqueous solution. The select compounds which are deposited by spray pyrolysis show considerable photodegradation efficiency. The studied different parameters such as concentration of dye, time deposition, salt source and seed layer position have a great effect on the photodegradation of this dye. Hydrothermal ZnO nanostructured were also tested for decolorization of MB and the results are very encourage especially for ZnO Nanorods (acetate salt) and ZnO nanoflowers for water treatment and gas sensing. Undoped and ZnO: Ag NPs films on glass and tissue, which prepared by sol-gel, show the capability of zinc oxide and silver nanoparticles to resist the growth of Gram – of K. pneumonia and E. coli by their inhibition zone which reaches 23 mm. Zinc nitrate as a precursor was used to prepare the Al/ ZnO/p-Si heterojunction by ultrasonic spray in order to investigate the photovoltaic parameters of the solar cell of this device. The I-V measurements indicate that the ideality factor n is 1.39 and the barrier height ϕb is 0.67 eV. The ϕb from I-V measurement and Norde’s function (0.69 eV) are in well agreement. While the series resistance Rs obtained from Norde’s function is found 1194 Ω. The diode has a good rectification property,photovoltaic behavior, photosensing and photoresponsivity properties. The electrical and photoelectric characterization confirms that this device is a very suitable candidate as a photodiode, photosensor applications and optoelectronic applications. The ISC and VOC were varied 11.12- 50.73 µA and 125.33- 185.22 mV for various illuminations. The C-V analysis shows that capacitance and conductance of the Al/ZnO/ p-Si diode depends on voltage and frequency. The Na, ϕb and Vbi of this structure are increased with the increasing frequencies.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BOU7776.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11610 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7776 BOU/7776 Thèse Bibliothèque principale Thèses Disponible Diagnostic d’un Plasma de Procédé de Couches Minces par Pulvérisation Cathodique / Nedjoua Benchiheb
Titre : Diagnostic d’un Plasma de Procédé de Couches Minces par Pulvérisation Cathodique Type de document : texte imprimé Auteurs : Nedjoua Benchiheb, Auteur ; Nadhir Attaf, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2015 Importance : 145 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Amorphous silicon Sputtering Plasma Optical emission spectroscopy Fast neutral Silicium amorphe Pulvérisation cathodique Spectroscopie d’émission optique Neutre rapide سيليسيوم لامتبلور رش مهبطي بلازما مطيافية الإنبعاث الضوئي الحيادي
السريعIndex. décimale : 530 Physique Résumé : Our study was carried out to a better understanding of the phenomena governing Rf glow discharge plasmas used for the deposition of amorphous silicon thin films by sputtering technique. The optical emission spectroscopy (OES) diagnostic technique allowed us to identify the different excited species present in the plasma and to study the influence of preparation conditions on their distributions in the space between electrodes. The transition
phenomena between α and γ regimes, as well as the multiplication by Penning effect, are observed.
A new tool to estimate the sputtering yield based on the rate of sputtered atom intensity to projectile atom is proposed. It allows us to estimate experimentally the contribution of the fast atom created from the symmetric charge transfer collision in the target sputtering process.
A physicochemical analysis shows the existence of a correlation between the three essential regions in the
reactor : target / plasma / substrate.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BEN6755.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9860 Diagnostic d’un Plasma de Procédé de Couches Minces par Pulvérisation Cathodique [texte imprimé] / Nedjoua Benchiheb, Auteur ; Nadhir Attaf, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2015 . - 145 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Amorphous silicon Sputtering Plasma Optical emission spectroscopy Fast neutral Silicium amorphe Pulvérisation cathodique Spectroscopie d’émission optique Neutre rapide سيليسيوم لامتبلور رش مهبطي بلازما مطيافية الإنبعاث الضوئي الحيادي
السريعIndex. décimale : 530 Physique Résumé : Our study was carried out to a better understanding of the phenomena governing Rf glow discharge plasmas used for the deposition of amorphous silicon thin films by sputtering technique. The optical emission spectroscopy (OES) diagnostic technique allowed us to identify the different excited species present in the plasma and to study the influence of preparation conditions on their distributions in the space between electrodes. The transition
phenomena between α and γ regimes, as well as the multiplication by Penning effect, are observed.
A new tool to estimate the sputtering yield based on the rate of sputtered atom intensity to projectile atom is proposed. It allows us to estimate experimentally the contribution of the fast atom created from the symmetric charge transfer collision in the target sputtering process.
A physicochemical analysis shows the existence of a correlation between the three essential regions in the
reactor : target / plasma / substrate.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BEN6755.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9860 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEN/6755 BEN/6755 Thèse Bibliothèque principale Thèses Disponible
Titre : Elaboration et caractérisation de couches minces PbS destinées aux détecteurs infrarouges Type de document : texte imprimé Auteurs : Lynda Beddek, Auteur ; Nadhir Attaf, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 174 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Sulfure de plomb CBD Couches minces Hétérojonctions Détecteur IR Lead sulfide Thin films heterojunctions IR detector كبريتيد الرصاص الترسيب بالحمام الكميائي الطبقات الرقيقة الخلاياالكهروضوئية كاشف IR Index. décimale : 530 Physique Résumé :
This thesis deals with the elaboration and characterization of lead sulfide films (PbS) for photovoltaic or infrared applications. We used the CBD chemical bath deposition method to synthesize these films, and this, for its simplicity and low cost. The deposit solution is composed of a lead salt and thiourea (CS(NH2)2) as sources of Pb and S, respectively.
Complexing agents are added to control the deposition rate and the pH of the bath. The
samples were prepared by varying several parameters: the nature of the Pb precursor, the concentration of thiourea in the bath, the pH of the bath, the mixture of two precursors of Pb,
the deposition time and doping by several elements (An Np's, Cu and Zn). The post deposited films were subjected to various characterizations: structural, morphological, optical and electrical. The structural characterization shows that the PbS film have a cubic structure with a preferential orientation along the (200) plane for moderate growth rate and changes to (111) plane for high rates. Optical characterization allowed us to note a significant broadening of
the optical gap up to 1.4 eV by quantum confinement effect for a relatively wide crystallites.
Measurements of the electrical conductivity of the films confirm that these materials are ptype and have a good conductivity in particular for films doped with Au nanoparticles. I-V characteristics of heterostructures PbS/CdS/FTO and PbS/ZnS/FTO made from films prepared according to the studied experimental conditions, show that thermal annealing significantly affects the leakage current of the structures studied. Photoelectric effect for the PbS/ZnS/FTO cell, based on co-doped Zn-Au PbS absorbent film, was observed. Calculations show relatively low characteristic values of short circuit current density, open circuit voltage and efficiency. These values are respectively equal to 5.84 mA / cm2, 417mV and 0.84%. We performed sensitivity tests of PbS films to infrared radiation. Thin films PbS are very sensitive to heat emitted by a hot body. The response of the PbS detector, by measuring R, upon exposure to IR radiation is linear, instantaneous and reproducible.Diplôme : Doctorat En ligne : ../theses/physique/BED6887.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10210 Elaboration et caractérisation de couches minces PbS destinées aux détecteurs infrarouges [texte imprimé] / Lynda Beddek, Auteur ; Nadhir Attaf, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2016 . - 174 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Sulfure de plomb CBD Couches minces Hétérojonctions Détecteur IR Lead sulfide Thin films heterojunctions IR detector كبريتيد الرصاص الترسيب بالحمام الكميائي الطبقات الرقيقة الخلاياالكهروضوئية كاشف IR Index. décimale : 530 Physique Résumé :
This thesis deals with the elaboration and characterization of lead sulfide films (PbS) for photovoltaic or infrared applications. We used the CBD chemical bath deposition method to synthesize these films, and this, for its simplicity and low cost. The deposit solution is composed of a lead salt and thiourea (CS(NH2)2) as sources of Pb and S, respectively.
Complexing agents are added to control the deposition rate and the pH of the bath. The
samples were prepared by varying several parameters: the nature of the Pb precursor, the concentration of thiourea in the bath, the pH of the bath, the mixture of two precursors of Pb,
the deposition time and doping by several elements (An Np's, Cu and Zn). The post deposited films were subjected to various characterizations: structural, morphological, optical and electrical. The structural characterization shows that the PbS film have a cubic structure with a preferential orientation along the (200) plane for moderate growth rate and changes to (111) plane for high rates. Optical characterization allowed us to note a significant broadening of
the optical gap up to 1.4 eV by quantum confinement effect for a relatively wide crystallites.
Measurements of the electrical conductivity of the films confirm that these materials are ptype and have a good conductivity in particular for films doped with Au nanoparticles. I-V characteristics of heterostructures PbS/CdS/FTO and PbS/ZnS/FTO made from films prepared according to the studied experimental conditions, show that thermal annealing significantly affects the leakage current of the structures studied. Photoelectric effect for the PbS/ZnS/FTO cell, based on co-doped Zn-Au PbS absorbent film, was observed. Calculations show relatively low characteristic values of short circuit current density, open circuit voltage and efficiency. These values are respectively equal to 5.84 mA / cm2, 417mV and 0.84%. We performed sensitivity tests of PbS films to infrared radiation. Thin films PbS are very sensitive to heat emitted by a hot body. The response of the PbS detector, by measuring R, upon exposure to IR radiation is linear, instantaneous and reproducible.Diplôme : Doctorat En ligne : ../theses/physique/BED6887.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10210 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BED/6887 BED/6887 Thèse Bibliothèque principale Thèses Disponible
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
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