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Papers by naoual houaidji
Metallofizika I Noveishie Tekhnologii, Oct 25, 2019
Magnesium oxide (MgO) powders are prepared by liquid-phase method and are characterized by X-ray ... more Magnesium oxide (MgO) powders are prepared by liquid-phase method and are characterized by X-ray diffraction (XRD), SEM and EDX characterization studies. The characterization confirms that MgO particles obtained shows cubic structure. The synthesized powders have high purity. The XRD analysis shows that nanocrystalline size of MgO nanoparticles is accompanied with remarkably uniform grain size.
Journal of Nano-and electronic Physics, 2019
Optik, Apr 1, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
The International Journal of Advanced Manufacturing Technology
Journal of Nano Research, 2020
The aim of this work is the production and the characterisation of (SnO2: (Mn, F)) thin films wit... more The aim of this work is the production and the characterisation of (SnO2: (Mn, F)) thin films with appropriate optoelectronic properties required for application as ohmic contacts in photovoltaic application devices. Transparent conducting Manganese-fluorine co-doped tin oxide (SnO2: (Mn, F)) thin films have been deposited onto preheated glass substrates using the chemical spray pyrolysis (CSP) method. The ([Mn2+]/[Sn4+]) atomic concentration ratio (y) in the spray solution is varied between 0 and 8 at. %. The structural, the opto-electrical and the photoluminescence properties of these thin films have been studied. It is found that the deposited thin films are polycrystalline with a tetragonal crystal structure corresponding to SnO2 phase having a preferred orientation along the (200) plane. Transmission and reflection spectra reveal the presence of interference fringes indicating the thickness uniformity and the surface homogeneity of the deposited samples. Photoluminescence behav...
METALLOFIZIKA I NOVEISHIE TEKHNOLOGII, 2020
In this paper, we predict the adhesion energy terms in metal/ceramic systems by using acoustic pa... more In this paper, we predict the adhesion energy terms in metal/ceramic systems by using acoustic parameters of these combinations. Different approaches are used. Semiempirical relations are deduced for all systems. As shown, in all cases, the adhesion energy W ad increases linearly with Rayleigh velocity of ceramic substrate V RC. It takes the form W ad = 0.07V RC + C, where the first term of this equation represents the van der Waals contribution to W ad , which only depends on V RC. The second term represents the equilibrium chemical bonds contribution (W chem-equil) and strongly depends on the systems combination as well as on the energy gap of the ceramics substrate. Moreover, the W chem-equil energy is higher for small bandgap ceramic materials due to substantial charge carriers' density inside ceramic crystal and, consequently, ease and height electron transfer through the metal/ceramic interface. In this case, the W chem-equil is essentially depends on Rayleigh velocity V RM of deposited metal. For large bandgap ceramic materials, there are practically no free charges inside ceramic crystal. In this case, the electrons' transfer cannot be taking place and, as a result, the W chem-equil contribution is negligible. The importance of obtained relation lies in its universality and applicability to all investigated systems.
METALLOFIZIKA I NOVEISHIE TEKHNOLOGII, 2020
Journal of Nano- and Electronic Physics, 2019
Тонкоплівковий сонячний елемент є сонячним елементом другого покоління, який виготовляється шляхо... more Тонкоплівковий сонячний елемент є сонячним елементом другого покоління, який виготовляється шляхом нанесення одного або більше тонких шарів. Головною новизною даної роботи є вперше зроблений аналіз параметрів, що перешкоджають ефективності фотоелектричного пристрою на основі гетеропереходу CdS/MoS2. У роботі досліджено вплив прозорого провідного оксиду (ППО) з використанням тонкої плівки оксиду цинку ZnO або оксиду свинцю PbO на характеристики сонячних елементів гетеропереходу CdS/MoS2 (щільність струму короткого замикання JSC, напруга розімкнутого ланцюга VCO, потужність-напруга (P-V) і ємність-напруга (С-V)). Усі ці характеристики реалізовані в одновимірній програмі чисельного моделювання SCAPS. Отримані результати показують, що в результаті використання ППО, щільність струму короткого замикання JSC зменшується як функція прикладеної напруги для обох елементів. Незначне зниження щільності струму відбувається нижче 0.6 В і суттєве – вище цієї напруги. З іншого боку, щільність потужності зростає майже лінійно до максимуму ~ 3.83 і 3.29 мВт/см2 для ZnO і PbO TCO, відповідно. Зміна ємності з напругою аналогічна зміні щільності струму для обох конфігурацій, і було виявлено, що ефективність сонячних елементів з покриттям ZnO вище, ніж елементів, покритих PbO.Thin film solar cell is a second generation solar cell that is made by depositing one or more thin layers. Debutant analysis of the parameters impeding the efficiency of the CdS/MoS2 heterojunction based photovoltaic device is the chief novelty of the present report. In this work, we investigated the effect of Transparent Conductive Oxide (TCO) utilizing zinc oxide (ZnO) or lead oxide (PbO) antireflective thin film (ARC) on the characteristics of CdS/MoS2 heterojunction solar cell (short circuit current density Jsc, open circuit voltage VCO, power-voltage (P-V) and capacitance-voltage (С-V)). All these options are implemented in the one-dimensional numerical simulation program SCAPS. The results obtained show that as a result of the use of TCO, the short circuit current density Jsc decreases as a function of the applied voltage for both cells. The decrease in the current density is modest below 0.6 V and sharper above. On the other hand, the power density increases almost linearly to a maximum of ~ 3.83 and 3.29 mW/cm2 for ZnO and PbO TCO, respectively. The variation in the capacitance with the voltage is similar to the variation of the current density for both configurations and we found that the efficiency of ZnO coating solar cells is higher than of cells coated with PbO
Journal of Nano Research, 2019
Transparent conducting Cobalt-fluorine co-doped tin oxide (SnO2: (Co, F)) thin filmswere deposite... more Transparent conducting Cobalt-fluorine co-doped tin oxide (SnO2: (Co, F)) thin filmswere deposited onto preheated glass substrates using the chemical spray pyrolysis method. The ([Co2+]/[Sn4+]) atomic concentration ratio (y)in the spray solution was varied between 0 and 5 at. %. The structural, electrical, optical and photoluminescence properties of these films were studied. It is found that the thin films are polycrystalline with a tetragonal crystal structure corresponding to SnO2 phase having a preferred orientation along the (200) plane. Transmission and reflection spectra reveal the presence of interference fringes indicating thickness uniformity and surface homogeneity of the deposited thin films. The electrical resistivity (ρ), volume carrier concentration density (Nv), surface carrier concentration density (Ns) and Hall mobility (μ) of the synthesized thin films were determined from the Hall Effect measurements in the Van der Paw-configuration and the following results were ...
METALLOFIZIKA I NOVEISHIE TEKHNOLOGII, 2019
METALLOFIZIKA I NOVEISHIE TEKHNOLOGII, 2019
Magnesium oxide (MgO) powders are prepared by liquid-phase method and are characterized by X-ray ... more Magnesium oxide (MgO) powders are prepared by liquid-phase method and are characterized by X-ray diffraction (XRD), SEM and EDX characterization studies. The characterization confirms that MgO particles obtained shows cubic structure. The synthesized powders have high purity. The XRD analysis shows that nanocrystalline size of MgO nanoparticles is accompanied with remarkably uniform grain size.
Optik, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Metallofizika I Noveishie Tekhnologii, Oct 25, 2019
Magnesium oxide (MgO) powders are prepared by liquid-phase method and are characterized by X-ray ... more Magnesium oxide (MgO) powders are prepared by liquid-phase method and are characterized by X-ray diffraction (XRD), SEM and EDX characterization studies. The characterization confirms that MgO particles obtained shows cubic structure. The synthesized powders have high purity. The XRD analysis shows that nanocrystalline size of MgO nanoparticles is accompanied with remarkably uniform grain size.
Journal of Nano-and electronic Physics, 2019
Optik, Apr 1, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
The International Journal of Advanced Manufacturing Technology
Journal of Nano Research, 2020
The aim of this work is the production and the characterisation of (SnO2: (Mn, F)) thin films wit... more The aim of this work is the production and the characterisation of (SnO2: (Mn, F)) thin films with appropriate optoelectronic properties required for application as ohmic contacts in photovoltaic application devices. Transparent conducting Manganese-fluorine co-doped tin oxide (SnO2: (Mn, F)) thin films have been deposited onto preheated glass substrates using the chemical spray pyrolysis (CSP) method. The ([Mn2+]/[Sn4+]) atomic concentration ratio (y) in the spray solution is varied between 0 and 8 at. %. The structural, the opto-electrical and the photoluminescence properties of these thin films have been studied. It is found that the deposited thin films are polycrystalline with a tetragonal crystal structure corresponding to SnO2 phase having a preferred orientation along the (200) plane. Transmission and reflection spectra reveal the presence of interference fringes indicating the thickness uniformity and the surface homogeneity of the deposited samples. Photoluminescence behav...
METALLOFIZIKA I NOVEISHIE TEKHNOLOGII, 2020
In this paper, we predict the adhesion energy terms in metal/ceramic systems by using acoustic pa... more In this paper, we predict the adhesion energy terms in metal/ceramic systems by using acoustic parameters of these combinations. Different approaches are used. Semiempirical relations are deduced for all systems. As shown, in all cases, the adhesion energy W ad increases linearly with Rayleigh velocity of ceramic substrate V RC. It takes the form W ad = 0.07V RC + C, where the first term of this equation represents the van der Waals contribution to W ad , which only depends on V RC. The second term represents the equilibrium chemical bonds contribution (W chem-equil) and strongly depends on the systems combination as well as on the energy gap of the ceramics substrate. Moreover, the W chem-equil energy is higher for small bandgap ceramic materials due to substantial charge carriers' density inside ceramic crystal and, consequently, ease and height electron transfer through the metal/ceramic interface. In this case, the W chem-equil is essentially depends on Rayleigh velocity V RM of deposited metal. For large bandgap ceramic materials, there are practically no free charges inside ceramic crystal. In this case, the electrons' transfer cannot be taking place and, as a result, the W chem-equil contribution is negligible. The importance of obtained relation lies in its universality and applicability to all investigated systems.
METALLOFIZIKA I NOVEISHIE TEKHNOLOGII, 2020
Journal of Nano- and Electronic Physics, 2019
Тонкоплівковий сонячний елемент є сонячним елементом другого покоління, який виготовляється шляхо... more Тонкоплівковий сонячний елемент є сонячним елементом другого покоління, який виготовляється шляхом нанесення одного або більше тонких шарів. Головною новизною даної роботи є вперше зроблений аналіз параметрів, що перешкоджають ефективності фотоелектричного пристрою на основі гетеропереходу CdS/MoS2. У роботі досліджено вплив прозорого провідного оксиду (ППО) з використанням тонкої плівки оксиду цинку ZnO або оксиду свинцю PbO на характеристики сонячних елементів гетеропереходу CdS/MoS2 (щільність струму короткого замикання JSC, напруга розімкнутого ланцюга VCO, потужність-напруга (P-V) і ємність-напруга (С-V)). Усі ці характеристики реалізовані в одновимірній програмі чисельного моделювання SCAPS. Отримані результати показують, що в результаті використання ППО, щільність струму короткого замикання JSC зменшується як функція прикладеної напруги для обох елементів. Незначне зниження щільності струму відбувається нижче 0.6 В і суттєве – вище цієї напруги. З іншого боку, щільність потужності зростає майже лінійно до максимуму ~ 3.83 і 3.29 мВт/см2 для ZnO і PbO TCO, відповідно. Зміна ємності з напругою аналогічна зміні щільності струму для обох конфігурацій, і було виявлено, що ефективність сонячних елементів з покриттям ZnO вище, ніж елементів, покритих PbO.Thin film solar cell is a second generation solar cell that is made by depositing one or more thin layers. Debutant analysis of the parameters impeding the efficiency of the CdS/MoS2 heterojunction based photovoltaic device is the chief novelty of the present report. In this work, we investigated the effect of Transparent Conductive Oxide (TCO) utilizing zinc oxide (ZnO) or lead oxide (PbO) antireflective thin film (ARC) on the characteristics of CdS/MoS2 heterojunction solar cell (short circuit current density Jsc, open circuit voltage VCO, power-voltage (P-V) and capacitance-voltage (С-V)). All these options are implemented in the one-dimensional numerical simulation program SCAPS. The results obtained show that as a result of the use of TCO, the short circuit current density Jsc decreases as a function of the applied voltage for both cells. The decrease in the current density is modest below 0.6 V and sharper above. On the other hand, the power density increases almost linearly to a maximum of ~ 3.83 and 3.29 mW/cm2 for ZnO and PbO TCO, respectively. The variation in the capacitance with the voltage is similar to the variation of the current density for both configurations and we found that the efficiency of ZnO coating solar cells is higher than of cells coated with PbO
Journal of Nano Research, 2019
Transparent conducting Cobalt-fluorine co-doped tin oxide (SnO2: (Co, F)) thin filmswere deposite... more Transparent conducting Cobalt-fluorine co-doped tin oxide (SnO2: (Co, F)) thin filmswere deposited onto preheated glass substrates using the chemical spray pyrolysis method. The ([Co2+]/[Sn4+]) atomic concentration ratio (y)in the spray solution was varied between 0 and 5 at. %. The structural, electrical, optical and photoluminescence properties of these films were studied. It is found that the thin films are polycrystalline with a tetragonal crystal structure corresponding to SnO2 phase having a preferred orientation along the (200) plane. Transmission and reflection spectra reveal the presence of interference fringes indicating thickness uniformity and surface homogeneity of the deposited thin films. The electrical resistivity (ρ), volume carrier concentration density (Nv), surface carrier concentration density (Ns) and Hall mobility (μ) of the synthesized thin films were determined from the Hall Effect measurements in the Van der Paw-configuration and the following results were ...
METALLOFIZIKA I NOVEISHIE TEKHNOLOGII, 2019
METALLOFIZIKA I NOVEISHIE TEKHNOLOGII, 2019
Magnesium oxide (MgO) powders are prepared by liquid-phase method and are characterized by X-ray ... more Magnesium oxide (MgO) powders are prepared by liquid-phase method and are characterized by X-ray diffraction (XRD), SEM and EDX characterization studies. The characterization confirms that MgO particles obtained shows cubic structure. The synthesized powders have high purity. The XRD analysis shows that nanocrystalline size of MgO nanoparticles is accompanied with remarkably uniform grain size.
Optik, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.