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Smart Grid and Renewable Energy 2020年第11期11卷 181-190页

作者： Alain Diasso raguilignaba sam Bernard Zouma François Zougmoré Department of physic Laboratory of Materials and Environment Units of Sciences and Technology University of Joseph Ki-Zerbo Ouagadougou Burkina Faso Units of Sciences and Technology Department of Physic University of Nazi Boni Bobo Dioulasso Burkina Faso Department of Physic Units of Sciences and Technology Laboratory of Thermal and Renewable Energy University of Ouagadougou Ouagadougou Burkina Faso

This manuscript presents a simple method for excess minority carriers’ lifetime measurement within the base region of p-n junction polycrystalline solar cell in transient mode. This work is an experimental transient 3-Dimensionnal study. The magnitude of the magnetic field B is varied from 0 mT to 0.045 mT. Indeed, the solar cell is illuminated by a stroboscopic flash with air mass 1.5 and under magnetic field in transient state. The experimental details are assumed in a figure. The procedure is outlined by the Open Circuit Voltage Decay analysis. Effective minority carrier life-time is calculated by fitting the linear zone of the transient voltage decay curve because linear decay is an ideal decay. The kaleidagraph software permits access to the slope of the curve which is inversely proportional to the lifetime. The external magnetic effects on minority carriers’ effective lifetime is then presented and analyzed.

2D Modeling of Solar Cell p-n Radial Junction: Study of Photocurrent Density and Quantum Efficiency in Static Mode under Monochromatic Illumination

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Smart Grid and Renewable Energy 2020年第12期11卷 191-200页

作者： raguilignaba sam Alain Diasso Bernard Zouma François Zougmoré Département de Physique UFR/ST Université Nazi Boni Bobo Dioulasso Burkina Faso Laboratoire de Matériaux et Environnement Département de Physique UFR/SEA Université Joseph Ki-Zerbo Ouagadougou Burkina Faso Laboratoire d’Energies Thermique Renouvelables (L.E.T.R.E) Université Joseph Ki-Zerbo Ouagadougou Burkina Faso

A theoretical study of a polysilicon solar cell with a radial junction in static regime under monochromatic illumination is presented in this paper. The junction radial solar cell geometry is illustrated and described. The carriers’ diffusion equation is established and solved under quasi-neutral base assumption with boundaries conditions and Bessel equations. New analytical expressions of electrons and holes photocurrent density and quantum efficiency are found. The wavelength and structural parameters (base radius, base thickness and wavelength) influences on photocurrent density and quantum efficiency are carried out and examined.

关键词： Grain Geometry Photocurrent Density Quantum Efficiency Radial Junction

2D Modeling of Solar Cell Radial Junction: Study of Carriers Charge Density and Photocurrent Density in Static Mode under Monochromatic Illumination

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Energy and Power Engineering 2020年第10期12卷 568-577页

作者： Moussa Ouédraogo raguilignaba sam Alain Diasso Bernard Zouma François Zougmoré Laboratoire de Maté riaux d’H&eacute liophysique et Environnement (LaMHE) D&eacute partement de Physique UFR/ST Universit&eacute Nazi Boni Bobo Dioulasso Burkina Faso Laboratoire de Maté riaux et Environnement D&eacute partement de Physique UFR/SEA Universit&eacute Joseph Ki-Zerbo Ouagadougou Burkina Faso Laboratoire d’Energies Thermique Renouvelables (L.E.T.R.E) Universit&eacute Joseph Ki-Zerbo Ouagadougou Burkina Faso

A theoretical study of a polysilicon solar cell with a radial junction in static regime under monochromatic illumination is presented in this paper. The junction radial solar cell geometry is illustrated and described. The carriers’ diffusion equation is established and solved under quasi-neutral base assumption with boundaries conditions and Bessel equations. New analytical expressions of electrons and holes density and photocurrent are found. The wavelength and structural parameters (base radius, emitter thickness) influences on charge carriers density and photocurrent are shown and examined.

关键词： Electrons Density Holes Density Holes Photocurrent Radial Junction

Effective Lifetime Experimental Measurement under External Magnetic Field in Transient Dynamic State by Open Circuit Voltage Decay Method

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Energy and Power Engineering 2020年第12期12卷 709-715页

作者： Nazé Yacouba Traoré raguilignaba sam Alain Diasso Bernard Zouma François Zougmoré University of Nazi Boni Department of physic Units of Sciences and Technology Bobo Dioulasso Burkina Faso University of Joseph Ki-Zerbo Department of Physic Laboratory of Materials and Environment Units of Sciences and Technology Ouagadougou Burkina Faso University of Ouagadougou Department of Physic Laboratory of Thermal and Renewable Energy Units of Sciences and Technology Ouagadougou Burkina Faso

In this work, we present an experimental transient 3-Dimensionnal study for the minority charge carriers’ effective lifetime measurement under magnetic field in transient dynamic state. The magnitude of the magnetic field B is varied from 0 mT to 0.03 mT. The method used is mainly based on the open circuit voltage decay method. The solar cell is injected by a low electrical excitation which protects against capacitance effects. Our approach is based on the open circuit voltage decay response analysis. From an experimental set-up, we get the transient voltage data on a digital scope. The data are used for plotting transient voltage decay curves. The curves obtained and analyzed are fitted in their linear zone. This zone presents an ideal decay which permits to get good values of lifetime. The slope of the linear decay is inversely proportional to effective lifetime. The results of fitting permit determinate the effective charge carriers’ lifetime directly. The results obtained are then presented and analyzed. The observations indicate that the charge carriers effective lifetime decrease when the magnetic field increases.

关键词： Effective Lifetime Electrical Excitation Frequential Dynamic Regime Magnetic Field

Characterization of Okra Convective Drying, Influence of Maturity

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Food and Nutrition Sciences 2014年第6期5卷 590-597页

作者： Ouoba Kondia Honoré Zougmoré François sam raguilignaba Toguyeni Aboubacar Desmorieux Hélène Laboratoire des Matériaux et Environnement(LAME) Unitéde Formation et de Recherche en Sciences Exactes et Appliquée(UFR/SEA)Universitéde OuagadougouOuagadougouBurkina Faso Laboratoire d’Automatisme et de Génie des Procédés(LAGEP) UCBL1-CNRS UMR 5007-CPE LyonBat.308G43 bd du 11 Nov.1918 VilleurbanneUniversité Claude Bernard Lyon 169622LyonFrance Institut de Développement Rural Université Polytechnique de BoboBobo-DioulassoBurkina Faso

An experimental study for the drying kinetics of whole okra was carried out. In the study, different ages were considered by taking into account influence of okra maturity on its convective drying. The 2D moisture evolution inside the product and its maturity were evaluated by fitting experimental data versus drying time. The water effective diffusion coefficient of okra at different maturity states was gotten by the experimental model using Fick’s second law. A parametric study was carried out in the ranging of okra age from 2 to 7 days at 60℃, both fruits gathered on the same plant to avoid divergences due to okra varieties that can induce difference on physical structure and the chemical composition. It was found from the experimental results that okra maturity has important influence on its behaviour during convective drying. At 2, 3, 4, 5 and 7 days old, the drying effective time was respectively 780, 1000, 1155, 850 and 750 min. Effective diffusivity of the okra in this order of age was 1.38 × 10-10, 6.09 × 10-11, 1.23 × 10-11, 8.98 × 10-11, and 1.05 × 10-10 m2/s in the present study, while the average initial moisture content was respectively 12.27, 9.00, 7.53, 5.97 and 4.92 Kgw/Kgdm.

关键词： Convective Drying Okra Effective Diffusivity Maturity Initial Moisture Content