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Partager le résultat de cette recherche Interroger des sources externesCaractérisation et analyse des cellules solaires à base de silicium multicristallin / Zohra Benmohamed
Titre : Caractérisation et analyse des cellules solaires à base de silicium multicristallin Type de document : texte imprimé Auteurs : Zohra Benmohamed ; Université Mentouri, Editeur scientifique ; Mohamed Remram, Directeur de thèse Année de publication : 2009 Importance : 95 f. Format : 30 cm Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD Langues : Français (fre) Tags : Caractérisation Analyse Cellules solaires Silicium multicristallin Impurities Dislocations Multicrystalline silicon Solar cells Efficiency
??????? ?????? ???????? ????????? ????? ??????????????? ??????? ???????Index. décimale : 621 Electronique Résumé : An understanding of the comportment of defects and Impurities in multicrystalline silicon in turn leads
to a clearer picture of the limiting mechanisms in solar cells made with this promising material, and points to
possible paths for improvement. In this study a three diagnostic approach has been adopted for the
characterization of multicrystalline silicon samples, it comprises structural, chemical and electrical analysis of
the various minority diffusion length limiting defects and impurities which are responsible for the degradation of
the performances of multicrystalline silicon solar cells.
Preferential defect etching ions provided for the structural analysis. This approach was useful in
determining the nature and distribution of the structural defects. The work then focuses on chemical
characterization of impurities and the analytical tool used for this purpose were Fourier Transform Infra-red
Spectroscopy (FTIR). The results of annealing processes shown that, Rapid Thermal Annealing can dissociate
some oxygen precipitates existing in silicon material. This dissociation is accompanied by a degradation of the
bulk diffusion length. The effect of RTA on oxygen precipitation is extensively depending on the thermal history
of the material, the initial oxygen content and the existing precipitates in the material.
The above characterization tools were well complemented by electrical characterization through
Surface photovoltage (SPV) to determined minority diffusion length.
The results of PC1D modelling on multicrystalline silicon solar cells revealed that dislocations are not
the major factor that influences electrical properties of material. Impurities which were already present in the
grown material in an inactive form in particular the growth of oxygen precipitates and metallic impurities and
which have been electrically activated in an inhomogeneous distribution are also a principal source of
deterioration of polycrystalline silicon solar cells performances.
Thus there is a scope for attaining still higher efficiencies by further optimization of growth material
and cell processes to reduce reflection loss and effectively trapping the light inside the cell.Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BEN5287.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=2774 Caractérisation et analyse des cellules solaires à base de silicium multicristallin [texte imprimé] / Zohra Benmohamed ; Université Mentouri, Editeur scientifique ; Mohamed Remram, Directeur de thèse . - 2009 . - 95 f. ; 30 cm.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Tags : Caractérisation Analyse Cellules solaires Silicium multicristallin Impurities Dislocations Multicrystalline silicon Solar cells Efficiency
??????? ?????? ???????? ????????? ????? ??????????????? ??????? ???????Index. décimale : 621 Electronique Résumé : An understanding of the comportment of defects and Impurities in multicrystalline silicon in turn leads
to a clearer picture of the limiting mechanisms in solar cells made with this promising material, and points to
possible paths for improvement. In this study a three diagnostic approach has been adopted for the
characterization of multicrystalline silicon samples, it comprises structural, chemical and electrical analysis of
the various minority diffusion length limiting defects and impurities which are responsible for the degradation of
the performances of multicrystalline silicon solar cells.
Preferential defect etching ions provided for the structural analysis. This approach was useful in
determining the nature and distribution of the structural defects. The work then focuses on chemical
characterization of impurities and the analytical tool used for this purpose were Fourier Transform Infra-red
Spectroscopy (FTIR). The results of annealing processes shown that, Rapid Thermal Annealing can dissociate
some oxygen precipitates existing in silicon material. This dissociation is accompanied by a degradation of the
bulk diffusion length. The effect of RTA on oxygen precipitation is extensively depending on the thermal history
of the material, the initial oxygen content and the existing precipitates in the material.
The above characterization tools were well complemented by electrical characterization through
Surface photovoltage (SPV) to determined minority diffusion length.
The results of PC1D modelling on multicrystalline silicon solar cells revealed that dislocations are not
the major factor that influences electrical properties of material. Impurities which were already present in the
grown material in an inactive form in particular the growth of oxygen precipitates and metallic impurities and
which have been electrically activated in an inhomogeneous distribution are also a principal source of
deterioration of polycrystalline silicon solar cells performances.
Thus there is a scope for attaining still higher efficiencies by further optimization of growth material
and cell processes to reduce reflection loss and effectively trapping the light inside the cell.Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BEN5287.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=2774 Exemplaires
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Titre : Effet de la température de recuit sur les propriétés physiques des couches minces de sulfure de plomb (PbS) élaborées par bain chimique Type de document : texte imprimé Auteurs : Samia Djebbar, Auteur ; A Benzagoutta, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2015 Importance : 118 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Couches minces PbS Bain chimique Cellules solaires Thin films chemical Bath Solar cells ??????? ??????? ????????? ??????? ??????? Index. décimale : 530 Physique Résumé : The objective of this work concerns the development and the characterization of the thin layers of PbS by a simple technique and good market in fact the method of deposit per chemical bath CBD (Chemical Bath Deposition).
In the first part of this work to us presented general information on the PbS material.The second part, we worked out a series of films with various conditions of deposit, for an optimization of the process with an aim of obtaining films of good quality for their use in solar energy.
The studied parameters are:
- Concentration of deferent the components.
- The alkalinity of bath (NaOH, KOH).
- The temperature of Annealing at 200o C.
The structural characterization of films revealed that the latter have a crystalline cubic structure. The optical and electric characterizations showed that the PbS films deposited by CBD enjoy good properties optoelectronics, good conductivity and a very good transparency with the light. What enabled us to conclude that the PbS films, worked out by a simple technique such as the CBD, can find applications potential in the realization of the solar cells in layer thin in particular and of the optoelectronic components in general.
Diplôme : Magistère En ligne : ../theses/physique/DJE6758.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9857 Effet de la température de recuit sur les propriétés physiques des couches minces de sulfure de plomb (PbS) élaborées par bain chimique [texte imprimé] / Samia Djebbar, Auteur ; A Benzagoutta, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2015 . - 118 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Couches minces PbS Bain chimique Cellules solaires Thin films chemical Bath Solar cells ??????? ??????? ????????? ??????? ??????? Index. décimale : 530 Physique Résumé : The objective of this work concerns the development and the characterization of the thin layers of PbS by a simple technique and good market in fact the method of deposit per chemical bath CBD (Chemical Bath Deposition).
In the first part of this work to us presented general information on the PbS material.The second part, we worked out a series of films with various conditions of deposit, for an optimization of the process with an aim of obtaining films of good quality for their use in solar energy.
The studied parameters are:
- Concentration of deferent the components.
- The alkalinity of bath (NaOH, KOH).
- The temperature of Annealing at 200o C.
The structural characterization of films revealed that the latter have a crystalline cubic structure. The optical and electric characterizations showed that the PbS films deposited by CBD enjoy good properties optoelectronics, good conductivity and a very good transparency with the light. What enabled us to conclude that the PbS films, worked out by a simple technique such as the CBD, can find applications potential in the realization of the solar cells in layer thin in particular and of the optoelectronic components in general.
Diplôme : Magistère En ligne : ../theses/physique/DJE6758.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9857 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
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Titre : Élaboration et caracterisation des films ZnS par bain chimique Type de document : texte imprimé Auteurs : Hichem Lekiket, Auteur ; Mohamed Salah Aida, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 116 f. Format : 30 cm. Note générale : 2 copies imprimes disponibles Langues : Français (fre) Tags : Science des matériaux semi-conducteurs Couches minces Sulfure de zinc Bain chimique Cellules solaires Thin films Zinc sulfide Chemical bath Solar cells ??????? ??????? ??????? ????? Index. décimale : 530 Physique Résumé : The present work deals with the study of ZnS thin film synthesis by chemical bath deposition
technique (CBD). The latter is known to be cheap and simple which motivates our choice of
this method. We have used Zinc sulfate (ZnSO4), Thiourea (CS(NH2)2), ammonia (NH3) and
hydrazine (N2H4). thin films were prepared with two different parameters such as the pH
and the solution temperature. The structural, optical and electrical properties of the obtained
films were characterized by means of several techniques. From structural studies of ZnS films
we inferred that ZnS films have a cubic structure with a preferential orientation (111).
The optical studies reveal that ZnS films have a large transparency in the visible range. This
comforts their using as buffer layer in thin films solar cells.Diplôme : Doctorat en sciences En ligne : ../theses/physique/LEK6849.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10146 Élaboration et caracterisation des films ZnS par bain chimique [texte imprimé] / Hichem Lekiket, Auteur ; Mohamed Salah Aida, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2016 . - 116 f. ; 30 cm.
2 copies imprimes disponibles
Langues : Français (fre)
Tags : Science des matériaux semi-conducteurs Couches minces Sulfure de zinc Bain chimique Cellules solaires Thin films Zinc sulfide Chemical bath Solar cells ??????? ??????? ??????? ????? Index. décimale : 530 Physique Résumé : The present work deals with the study of ZnS thin film synthesis by chemical bath deposition
technique (CBD). The latter is known to be cheap and simple which motivates our choice of
this method. We have used Zinc sulfate (ZnSO4), Thiourea (CS(NH2)2), ammonia (NH3) and
hydrazine (N2H4). thin films were prepared with two different parameters such as the pH
and the solution temperature. The structural, optical and electrical properties of the obtained
films were characterized by means of several techniques. From structural studies of ZnS films
we inferred that ZnS films have a cubic structure with a preferential orientation (111).
The optical studies reveal that ZnS films have a large transparency in the visible range. This
comforts their using as buffer layer in thin films solar cells.Diplôme : Doctorat en sciences En ligne : ../theses/physique/LEK6849.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10146 Exemplaires (1)
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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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