IEEE Transactions on Dielectrics and Electrical Insulation, 2008
Space charge behavior at physical interfaces in cross-linked polyethylene (XLPE) films subjected ... more Space charge behavior at physical interfaces in cross-linked polyethylene (XLPE) films subjected to a dc field has been investigated as a function of the nature of the interfaces using the pulsed electro-acoustic technique. Aluminum, gold and carbon black-loaded polyethylene were used as electrodes to investigate space charge build-up in a single dielectric layer. A sandwich structure constituted by two dielectric
2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2009
In this work we study the formation and evolution of the space charge with time, a double layer (... more In this work we study the formation and evolution of the space charge with time, a double layer (LDPE and FEP) with special attention to the interfaces between electrode and dielectric and between two dielectrics of different kinds. The technique of measuring the space charge method is the pulsed electro-acoustic. We have shown that the classic description of the charge
In this paper, the effect of electrode materials on the formation of the interfacial charge betwe... more In this paper, the effect of electrode materials on the formation of the interfacial charge between two dielectrics has been investigated. A sandwich structure constituted by two dielectric films: Low Density Polyethylene (LDPE) and Fluorinated Ethylene Propylene (FEP), was subjected to high DC electric stresses for extended periods of time and space charge measurements were taken using the pulsed electro acoustic (PEA) technique. Aluminum, gold, and carbon black-loaded polyethylene were used as electrodes to investigate the charging behavior of the electrode/dielectric and dielectric/dielectric interfaces. The time dependence of the space charge distribution was subsequently recorded at room temperature under field (polarization) and short circuit conditions (depolarization). Experimental results demonstrated that a charge injected process took place in all cases. However it is shown that the sign and the amount of interfacial charge depend strongly on the nature and the polarity o...
Space charge behaviour at physical interfaces in cross-linked polyethylene (XLPE) films submitted... more Space charge behaviour at physical interfaces in cross-linked polyethylene (XLPE) films submitted to DC field has been investigated as a function of the nature of the interfaces using the pulsed electro-acoustic technique. Aluminium, gold and carbon black-loaded polyethylene were used as electrodes to investigate space charge builtup in a single dielectric layer. Charge injection rather than ionic species migration is seen to control space charge distribution in agreement with the storage conditions of the XLPE films. It is shown that the sign and distribution of space charge depend drastically on the nature and polarity of the electrodes Index Terms — Space charge, dielectric interface, pulsed electro acoustic technique.
This study investigates the effects of buffer layer and electrode contact on various structures o... more This study investigates the effects of buffer layer and electrode contact on various structures of an organic solar cell (OSC), including the effect of the thickness of the active layer and the band gap, simultaneously. This study analyzes different structures of OSCs based on materials that are commonly used for organic cells improvement. The organic solar cell with the blend poly(3-hexylthiophene-2,5-diyl) (P3HT):phenyl-C 61 -butyric-acid-methyl ester (PCBM) has been used for the proposed model, yielding the following results: power conversion efficiency (PCE) = 4.20%, open circuit voltage ( V oc ) = 0.60 V, short circuit current density ( J sc ) = 10.86 mA/cm 2 , fill factor = 64.68%. The effect of changing the electrode contact has given PCE from 1.18% to 11.54%, whereas PCE of the effect of changing the buffer layer was from 1.43% to 13.17%. The characteristics of the current density–voltage (J–V) for all structures were comparatively analyzed, and the proposed model has been a...
In this paper, the behavior of the electrical conductivity of epoxy/silicon carbide (SiC) composi... more In this paper, the behavior of the electrical conductivity of epoxy/silicon carbide (SiC) composites as a function of weight fraction and particle size of SiC at room temperature has been investigated. Composite samples were prepared by a mixture composed of the same amount of hardener and resin (5 mg) with different amounts (ranging from 5 mg to 7 mg) of silicon carbide powder with different grain sizes (400 and 800 grit). The conduction current was measured under different applied voltages from 1 to 10 kV (corresponding to applied electrical fields from 0.04 kV/mm to 0.4 kV/mm), and the composites microstructure was characterized by scanning electron microscopy. It was shown that the electrical conductivity of epoxy/SiC composites was found to increase when the weight fraction of SiC was increased and also to increase non-linearly as a function of the electrical field.
This paper reports the simulation and optimization of an organic/inorganic perovskite-based photo... more This paper reports the simulation and optimization of an organic/inorganic perovskite-based photovoltaic solar cell. Several structures for PSC are found in literature in order to enhance the conversion efficiency. The objectif of this work is to study and investigate different structures of solar cells based on perovskite materials to improve their performances. The simulated solar cell is made by sandwiching TiO2/Perovskite/spiro-OMeTAD layers where TiO2 is the electron transport layer (ETL), spiro-OMeTAD is the hole transport layer (HTL) and both CH3NH3PbI3 CH3NH3SnI3 are the perovskite (PVK) absorber layers. Therefore, the layer thicknesses of different materials are modified in order to find the better conversion efficiency of solar cells. The obtained results show that layer thicknesses that provide the maximum power conversion efficiency of 18.16% and 9.56% for both perovskite materials CH3NH3PbI3 and CH3NH3SnI3, respectively are 200 nm, 100 nm and 500 nm for spiro-OMeTAD, TiO2 and PVK materials, respectively. The numerical simulation was performed using the ATLAS device simulation software.
IEEE Transactions on Dielectrics and Electrical Insulation, 2008
Space charge behavior at physical interfaces in cross-linked polyethylene (XLPE) films subjected ... more Space charge behavior at physical interfaces in cross-linked polyethylene (XLPE) films subjected to a dc field has been investigated as a function of the nature of the interfaces using the pulsed electro-acoustic technique. Aluminum, gold and carbon black-loaded polyethylene were used as electrodes to investigate space charge build-up in a single dielectric layer. A sandwich structure constituted by two dielectric
2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2009
In this work we study the formation and evolution of the space charge with time, a double layer (... more In this work we study the formation and evolution of the space charge with time, a double layer (LDPE and FEP) with special attention to the interfaces between electrode and dielectric and between two dielectrics of different kinds. The technique of measuring the space charge method is the pulsed electro-acoustic. We have shown that the classic description of the charge
In this paper, the effect of electrode materials on the formation of the interfacial charge betwe... more In this paper, the effect of electrode materials on the formation of the interfacial charge between two dielectrics has been investigated. A sandwich structure constituted by two dielectric films: Low Density Polyethylene (LDPE) and Fluorinated Ethylene Propylene (FEP), was subjected to high DC electric stresses for extended periods of time and space charge measurements were taken using the pulsed electro acoustic (PEA) technique. Aluminum, gold, and carbon black-loaded polyethylene were used as electrodes to investigate the charging behavior of the electrode/dielectric and dielectric/dielectric interfaces. The time dependence of the space charge distribution was subsequently recorded at room temperature under field (polarization) and short circuit conditions (depolarization). Experimental results demonstrated that a charge injected process took place in all cases. However it is shown that the sign and the amount of interfacial charge depend strongly on the nature and the polarity o...
Space charge behaviour at physical interfaces in cross-linked polyethylene (XLPE) films submitted... more Space charge behaviour at physical interfaces in cross-linked polyethylene (XLPE) films submitted to DC field has been investigated as a function of the nature of the interfaces using the pulsed electro-acoustic technique. Aluminium, gold and carbon black-loaded polyethylene were used as electrodes to investigate space charge builtup in a single dielectric layer. Charge injection rather than ionic species migration is seen to control space charge distribution in agreement with the storage conditions of the XLPE films. It is shown that the sign and distribution of space charge depend drastically on the nature and polarity of the electrodes Index Terms — Space charge, dielectric interface, pulsed electro acoustic technique.
This study investigates the effects of buffer layer and electrode contact on various structures o... more This study investigates the effects of buffer layer and electrode contact on various structures of an organic solar cell (OSC), including the effect of the thickness of the active layer and the band gap, simultaneously. This study analyzes different structures of OSCs based on materials that are commonly used for organic cells improvement. The organic solar cell with the blend poly(3-hexylthiophene-2,5-diyl) (P3HT):phenyl-C 61 -butyric-acid-methyl ester (PCBM) has been used for the proposed model, yielding the following results: power conversion efficiency (PCE) = 4.20%, open circuit voltage ( V oc ) = 0.60 V, short circuit current density ( J sc ) = 10.86 mA/cm 2 , fill factor = 64.68%. The effect of changing the electrode contact has given PCE from 1.18% to 11.54%, whereas PCE of the effect of changing the buffer layer was from 1.43% to 13.17%. The characteristics of the current density–voltage (J–V) for all structures were comparatively analyzed, and the proposed model has been a...
In this paper, the behavior of the electrical conductivity of epoxy/silicon carbide (SiC) composi... more In this paper, the behavior of the electrical conductivity of epoxy/silicon carbide (SiC) composites as a function of weight fraction and particle size of SiC at room temperature has been investigated. Composite samples were prepared by a mixture composed of the same amount of hardener and resin (5 mg) with different amounts (ranging from 5 mg to 7 mg) of silicon carbide powder with different grain sizes (400 and 800 grit). The conduction current was measured under different applied voltages from 1 to 10 kV (corresponding to applied electrical fields from 0.04 kV/mm to 0.4 kV/mm), and the composites microstructure was characterized by scanning electron microscopy. It was shown that the electrical conductivity of epoxy/SiC composites was found to increase when the weight fraction of SiC was increased and also to increase non-linearly as a function of the electrical field.
This paper reports the simulation and optimization of an organic/inorganic perovskite-based photo... more This paper reports the simulation and optimization of an organic/inorganic perovskite-based photovoltaic solar cell. Several structures for PSC are found in literature in order to enhance the conversion efficiency. The objectif of this work is to study and investigate different structures of solar cells based on perovskite materials to improve their performances. The simulated solar cell is made by sandwiching TiO2/Perovskite/spiro-OMeTAD layers where TiO2 is the electron transport layer (ETL), spiro-OMeTAD is the hole transport layer (HTL) and both CH3NH3PbI3 CH3NH3SnI3 are the perovskite (PVK) absorber layers. Therefore, the layer thicknesses of different materials are modified in order to find the better conversion efficiency of solar cells. The obtained results show that layer thicknesses that provide the maximum power conversion efficiency of 18.16% and 9.56% for both perovskite materials CH3NH3PbI3 and CH3NH3SnI3, respectively are 200 nm, 100 nm and 500 nm for spiro-OMeTAD, TiO2 and PVK materials, respectively. The numerical simulation was performed using the ATLAS device simulation software.
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