Résultat de la recherche
5 résultat(s) recherche sur le tag 'spray pyrolysis' 
Affiner la recherche Générer le flux rss de la recherche
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) Tags : 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 ??????? ??????? ????? ????? ???? ????????? ?????? ??????? ??????? ????? ???? ???? 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 : https://bu.umc.edu.dz/md/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 . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2015 . - 103 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : 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 ??????? ??????? ????? ????? ???? ????????? ?????? ??????? ??????? ????? ???? ???? 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 : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10036 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
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
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
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
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
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Elaboration et caractérisation de couches minces SnS Type de document : texte imprimé Auteurs : Meriem Messaoudi, Auteur ; Mohamed Salah Aida, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 120 f. Format : 30 cm. Note générale : 2 copies imprimes disponibles Langues : Français (fre) Tags : Physique des couches minces Sulfure d’étain Spray ultrasonique Couches minces Cellules solaire Tin sulfide Spray pyrolysis Thin films Solar cells ??????? ??????? ???? ??? ?????? Index. décimale : 530 Physique Résumé : The present work deals with the deposition and characterization of tin sulfide thin film for the
photovoltaic application. Films were synthesized by spray pyrolysis technique due to its simplicity
and low cost. The starting solutions, were composed of tin chloride (SnCl2) and thiourea (CS
(NH2)2) as a source of Sn and S respectively. Sets of films were prepared by varying four
deposition parameters namely deposition time, solvent, spray flow rate and substrate temperature.
After preparation films were subjected of various characterizations: structural, morphological,
optical and electrical. The structural characterization indicates that SnS films have an
orthorhombic structure with a preferential orientation (111) when prepared at low flow rate, high
substrate temperature and distilled water as solvent. However, secondary phases such as Sn2S3,
SnO2 and Sn metal are detected in films prepared with methanol as solvent. SEM results indicate
the presence of bubbles and craters on the surface of films prepared with methanol, this is due to
the sulfur exo-diffusion in form gas of S2. The optical studies show that SnS film has a large
absorption coefficient in the visible range; the optical gap value is in the order of 1.3eV suggesting
that SnS thin films can be a good candidate for thin films solar cells. The electrical measurements
indicate that films prepared at high substrate temperature have a large conductivity. The I-V
characterization of the two realized SnS/CdS and SnS/ZnS heterostructures reveal a typical
behavior of a heterojunction with a good ideality factor; their characteristics are improved after
thermal annealing. The Au/SnS/CdS/FTO heterojunction exhibits a photovoltaic effect but with a
poor efficiency.Diplôme : Doctorat En ligne : ../theses/physique/MES6845.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10143 Elaboration et caractérisation de couches minces SnS [texte imprimé] / Meriem Messaoudi, Auteur ; Mohamed Salah Aida, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2016 . - 120 f. ; 30 cm.
2 copies imprimes disponibles
Langues : Français (fre)
Tags : Physique des couches minces Sulfure d’étain Spray ultrasonique Couches minces Cellules solaire Tin sulfide Spray pyrolysis Thin films Solar cells ??????? ??????? ???? ??? ?????? Index. décimale : 530 Physique Résumé : The present work deals with the deposition and characterization of tin sulfide thin film for the
photovoltaic application. Films were synthesized by spray pyrolysis technique due to its simplicity
and low cost. The starting solutions, were composed of tin chloride (SnCl2) and thiourea (CS
(NH2)2) as a source of Sn and S respectively. Sets of films were prepared by varying four
deposition parameters namely deposition time, solvent, spray flow rate and substrate temperature.
After preparation films were subjected of various characterizations: structural, morphological,
optical and electrical. The structural characterization indicates that SnS films have an
orthorhombic structure with a preferential orientation (111) when prepared at low flow rate, high
substrate temperature and distilled water as solvent. However, secondary phases such as Sn2S3,
SnO2 and Sn metal are detected in films prepared with methanol as solvent. SEM results indicate
the presence of bubbles and craters on the surface of films prepared with methanol, this is due to
the sulfur exo-diffusion in form gas of S2. The optical studies show that SnS film has a large
absorption coefficient in the visible range; the optical gap value is in the order of 1.3eV suggesting
that SnS thin films can be a good candidate for thin films solar cells. The electrical measurements
indicate that films prepared at high substrate temperature have a large conductivity. The I-V
characterization of the two realized SnS/CdS and SnS/ZnS heterostructures reveal a typical
behavior of a heterojunction with a good ideality factor; their characteristics are improved after
thermal annealing. The Au/SnS/CdS/FTO heterojunction exhibits a photovoltaic effect but with a
poor efficiency.Diplôme : Doctorat En ligne : ../theses/physique/MES6845.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10143 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
