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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
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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 Realization and electrical characterization of thin film heterojunction for photovoltaic application. / Fatima Zohra Boutebakh
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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