The European Physical Journal Applied Physics, 2018
This paper reports a study on the effect of different parameters such as charge carriers mobility... more This paper reports a study on the effect of different parameters such as charge carriers mobility, electrodes work function, energy gap, series as well as shunt resistances on the performances of an organic photovoltaic cell based on polymer/fullerene P3HT: PCBM. Thus, numerical simulations have been investigated on ITO/PEDOT:PSS/P3HT: PCBM/LiF/Al structure with Analysis of Microelectronic and Photonic Structures the simulation one dimension (AMPS-1D) and General-Purpose Photovoltaic Device Model (GPVDM) softwares. The results show that the optimum efficiency is obtained for electron and hole motility values of 10−4 cm2 V−1 s−1 and 2 × 10−4 cm2 V−1 s−1, respectively. Moreover, we reported that the ohmic contact for both anode and cathode electrodes of the investigated device remains very important to get the maximum efficiency. Furthermore, when the gap energy increases, the efficiency is considerably improved, and reach's a value of about 5.421%. In addition, in this present wo...
Ce travail de these se decompose en trois parties. La premiere partie est consacree a la presenta... more Ce travail de these se decompose en trois parties. La premiere partie est consacree a la presentation du concept de generation-recombinaison, au rappel des equations fondamentales du modele de Shockley-Read et a l'analyse des mecanismes d'emission et de capture des porteurs de charges. Dans la deuxieme partie de ce travail, on presente l'ensemble des bancs de caracterisation que nous avons realise, en particulier les techniques de caracterisation C(V,T), I(V,T) et DLTS. Ensuite, le principe de la DLTS, ses possibilites et ses limites sont discutes : cinq techniques d'analyse DLTS ont ainsi ete developpees et evaluees. L'analyse comparee de ces methodes porte sur les criteres de performances principaux qui sont le niveau de complexite de mise en œuvre et la resolution spectrale (c'est-a-dire la capacite a distinguer des niveaux d'energies tres proches dans le cas de transitoires multiexponentiels). Enfin, une etude de quelques techniques de lissage necessaire pour s'affranchir du bruit affectant les signaux experimentaux nous a conduit a retenir la Transformee en Ondelettes Discretes apparaissant comme la plus efficace. La troisieme partie du memoire est consacree au developpement d'une nouvelle technique d'analyse haute resolution des transitoires de capacite. Cette technique que nous avons nomme LM-DLTS est proposee pour ameliorer l'extraction des parametres physiques caracteristiques des defauts profonds, et ce meme pour de faibles valeurs du rapport signal sur bruit. Enfin, les possibilites d'application de cette methode sont ensuite illustrees par une application de la DLTS pour l'analyse des profils de concentration des defauts en fonction de la profondeur et plus particulierement l'etude des phenomenes de diffusion du bore dans le silicium.
In this paper, we present reliable guidelines allowing to maximize the detection and analysis of ... more In this paper, we present reliable guidelines allowing to maximize the detection and analysis of deep defects in semiconductors by introducing a new method of analysis that we named Modified Levenberg-Marquardt Deep-Level Transient Spectroscopy (MLM-DLTS) based on the Levenberg-Marquardt algorithm that we modified deliberately and associated with two other high-resolution techniques, i.e. the Matrix Pencil algorithm and modified Prony's method. The performances of the method were first assessed with a procedure of simulation by generating multi-exponential capacitance transients with a changing signal-to-noise ratio. These different tests have demonstrated to what extent such a method of analysis is more efficient than classic correlation methods based on DLTS spectra and than three high-resolution methods already existing in the literature. Finally, when the signal-to-noise ratio is low, and in the aim of getting precise results, a few smoothing algorithms were tested. Our findings evidence how the smoothing quality can be controlled under certain conditions while avoiding both the distortions in the shape of the capacitance transients and the DLTS spectra.
2020 International Conference on Intelligent Systems and Computer Vision (ISCV), 2020
Exponentially decaying signals occur in various parts of nature and affect the performance and fl... more Exponentially decaying signals occur in various parts of nature and affect the performance and flexibility of signals. In fact, that drives scientists to invest in a perpetual search for new solutions. To meet this challenge few methods are proposed. In this study, we focused on the use of the Prony Method and Bessel and Butterworth smoothing methods in the LabVIEW environment for estimating the parameters of a sum of real exponential signals in the presence of noise. The performances of the proposed method are illustrated using simulated data, clearly showing the improved performance of the Prony Method and especially with Butterworth filter.
The European Physical Journal Applied Physics, 2018
This paper reports a study on the effect of different parameters such as charge carriers mobility... more This paper reports a study on the effect of different parameters such as charge carriers mobility, electrodes work function, energy gap, series as well as shunt resistances on the performances of an organic photovoltaic cell based on polymer/fullerene P3HT: PCBM. Thus, numerical simulations have been investigated on ITO/PEDOT:PSS/P3HT: PCBM/LiF/Al structure with Analysis of Microelectronic and Photonic Structures the simulation one dimension (AMPS-1D) and General-Purpose Photovoltaic Device Model (GPVDM) softwares. The results show that the optimum efficiency is obtained for electron and hole motility values of 10−4 cm2 V−1 s−1 and 2 × 10−4 cm2 V−1 s−1, respectively. Moreover, we reported that the ohmic contact for both anode and cathode electrodes of the investigated device remains very important to get the maximum efficiency. Furthermore, when the gap energy increases, the efficiency is considerably improved, and reach's a value of about 5.421%. In addition, in this present wo...
Ce travail de these se decompose en trois parties. La premiere partie est consacree a la presenta... more Ce travail de these se decompose en trois parties. La premiere partie est consacree a la presentation du concept de generation-recombinaison, au rappel des equations fondamentales du modele de Shockley-Read et a l'analyse des mecanismes d'emission et de capture des porteurs de charges. Dans la deuxieme partie de ce travail, on presente l'ensemble des bancs de caracterisation que nous avons realise, en particulier les techniques de caracterisation C(V,T), I(V,T) et DLTS. Ensuite, le principe de la DLTS, ses possibilites et ses limites sont discutes : cinq techniques d'analyse DLTS ont ainsi ete developpees et evaluees. L'analyse comparee de ces methodes porte sur les criteres de performances principaux qui sont le niveau de complexite de mise en œuvre et la resolution spectrale (c'est-a-dire la capacite a distinguer des niveaux d'energies tres proches dans le cas de transitoires multiexponentiels). Enfin, une etude de quelques techniques de lissage necessaire pour s'affranchir du bruit affectant les signaux experimentaux nous a conduit a retenir la Transformee en Ondelettes Discretes apparaissant comme la plus efficace. La troisieme partie du memoire est consacree au developpement d'une nouvelle technique d'analyse haute resolution des transitoires de capacite. Cette technique que nous avons nomme LM-DLTS est proposee pour ameliorer l'extraction des parametres physiques caracteristiques des defauts profonds, et ce meme pour de faibles valeurs du rapport signal sur bruit. Enfin, les possibilites d'application de cette methode sont ensuite illustrees par une application de la DLTS pour l'analyse des profils de concentration des defauts en fonction de la profondeur et plus particulierement l'etude des phenomenes de diffusion du bore dans le silicium.
In this paper, we present reliable guidelines allowing to maximize the detection and analysis of ... more In this paper, we present reliable guidelines allowing to maximize the detection and analysis of deep defects in semiconductors by introducing a new method of analysis that we named Modified Levenberg-Marquardt Deep-Level Transient Spectroscopy (MLM-DLTS) based on the Levenberg-Marquardt algorithm that we modified deliberately and associated with two other high-resolution techniques, i.e. the Matrix Pencil algorithm and modified Prony's method. The performances of the method were first assessed with a procedure of simulation by generating multi-exponential capacitance transients with a changing signal-to-noise ratio. These different tests have demonstrated to what extent such a method of analysis is more efficient than classic correlation methods based on DLTS spectra and than three high-resolution methods already existing in the literature. Finally, when the signal-to-noise ratio is low, and in the aim of getting precise results, a few smoothing algorithms were tested. Our findings evidence how the smoothing quality can be controlled under certain conditions while avoiding both the distortions in the shape of the capacitance transients and the DLTS spectra.
2020 International Conference on Intelligent Systems and Computer Vision (ISCV), 2020
Exponentially decaying signals occur in various parts of nature and affect the performance and fl... more Exponentially decaying signals occur in various parts of nature and affect the performance and flexibility of signals. In fact, that drives scientists to invest in a perpetual search for new solutions. To meet this challenge few methods are proposed. In this study, we focused on the use of the Prony Method and Bessel and Butterworth smoothing methods in the LabVIEW environment for estimating the parameters of a sum of real exponential signals in the presence of noise. The performances of the proposed method are illustrated using simulated data, clearly showing the improved performance of the Prony Method and especially with Butterworth filter.
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Papers by Mounir Hanine