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Determination of the Series Resistance of a Series Vertical-Junction Silicon (N+/P/P+) Solar Cell under Polychromatic Illumination and Magnetic Field: Effect of Optimum Thickness

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Journal of Modern Physics 2024年第10期15卷 1543-1554页

作者： dibor faye Babou Dione Mountaga Boiro Pape Diop Semiconductor and Solar Energy Laboratory Department of Physics Cheikh Anta Diop University Dakar Senegal

By solving the magneto-transport equation for excess minority charge carriers in the base of the series vertical-junction silicon cell, the phenomenological parameters of the cell can be determined from the boundary conditions. Photocurrent density and photovoltage are determined for each value of applied magnetic field and corresponding optimum thickness, to establish the current-voltage characteristic (Jph(Sf, Sb, z, B, Hop)-Vph(Sf, Sb, z, B, Hop) of the silicon cell under polychromatic illumination. This study will make it possible to reduce the material used (by reducing the optimum thickness), which will help to lower prices. It will also enable us to reduce betting effects (lower series resistance), thereby boosting solar cell efficiency.

关键词： Series Vertical Junction Silicon Cell Static Regime Magnetic Field Optimum Thickness Series Resistance

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Lamella Silicon Solar Cell under Both Temperature and Magnetic Field: Width Optimum Determination

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Journal of Electromagnetic Analysis and Applications 2020年第4期12卷 43-55页

作者： dibor faye Sega Gueye Mor Ndiaye Mamadou Lamine Ba Ibrahima Diatta Youssou Traore Masse Samba Diop Gora Diop Amadou Diao Gregoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal

This work deals with determining the optimum thickness of the lamella wafer of silicon solar cell. The (p) base region makes up the bulk of the thickness of the wafer. This thickness has always been a factor limiting the performance of the solar cell, as it produces the maximum amount of electrical charges, contributing to the photocurrent. Determining the thickness of the wafer cannot be only mechanical. It takes into account the internal physical mechanisms of generation-diffusion-recombination of excess minority carriers. They are also influenced by external factors such as temperature and magnetic field. Under these conditions, magneto transport equation is required to be applied on excess minority carrier in lamella base silicon solar cell. It yields maximum diffusion coefficient which result on Lorentz law and Umklapp process. Then from photocurrent, back surface recombination velocity expressions are derived, both maximum diffusion coefficient and thickness dependent. The plot of the back surface recombination calibration curves as function of lamella width, leads to its maximum values, trough intercept points. Lamella optimum width is then obtained, both temperature and magnetic field dependent and expressed in relationships to show the required base thickness in the elaboration process.

关键词： Silicon Vertical Junction Back Surface Recombination Velocity Magnetic Field Temperature Lamella Width

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Ischemic Stroke Complicating Neuromeningeal and Pulmonary Tuberculosis in Children: About a Case in Senegal

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Open Journal of Pediatrics 2023年第1期13卷 92-96页

作者： Papa Souleye Sow Khadim Bop Khalifa Ababacar Mbaye Guillaye Diagne Pape Malick dibor Diouf Idrissa Demba Ba Papa Moctar faye Amadou Lamine Fall Ousmane Ndiaye National Hospital Center of Children Albert Royer Dakar Sénégal National Hospital Center of Fann Dakar Sénégal

Tuberculosis is a major public health problem, especially in developing countries. Neuro-meningeal involvement is rare but represents one of the most severe forms with high morbidity and mortality. We report the case of an ischemic stroke complicating neuromeningeal and pulmonary tuberculosis in a four-month-old infant at the National Hospital Center of children Albert Royer (Senegal). The case was a four-month-old, male infant with no history. His vaccination was up to date according to Senegal’s expanded vaccination program. There was no notion of tuberculosis contagion. He was seen for a prolonged fever for more than a month and chronic cough. He had moderate malnutrition. Neurological examination revealed coma, meningeal syndrome, generalized tonic convulsions and hypertonia. The pupils were in bilateral miosis. Osteotendinous reflexes were abolished with a bilateral Babinski sign. He also had severe respiratory distress, bilateral pulmonary condensation syndrome. Brain computed tomography was in favor of an ischemic stroke. The test GeneXpert MTB/RIF was positive on cerebrospinal fluid and gastric tubing fluid. The curative treatment was based on a quadruple therapy based on rifampicin, isoniazid, pirazinamide and ethambutol. The evolution was unfavorable with the death of the patient.

关键词： Tuberculosis Meningitis Child Senegal

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