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Comparative Studies on Reflection Defect between Textured and Planar Surface Based on TCO Materials

Energy and Power Engineering 2022年第10期14卷 550-557页

作者： Alassane Diaw Papa Touty Traore awa dieye Physics Department Cheikh Anta Diop University Dakar Senegal

This article presents, on the one hand, the performance of ARC by configurations ITO/Si, MgO/Si, and GeO2/Si. On the other hand, we study the impact of thickness on the reflection of OCTs, because the thickness of OCTs plays an important role on the optical properties and the variation of the reflection and transmission of TCO/Si heterojunctions as a function of thickness is also sown. And the last part of the paper, we will make a comparative study between the performance of silicon textured on the front side and that of silicon where the front side is planar. These two forms of silicon will be covered with ARC. For this, we will use the following materials ITO, MgO, and GeO2 and we represent the variation of the reflection of CAR on a planar surface and on a textured surface as a function of the wavelength. The results show that the reflection is low in textured surface compare to the planar surface.

关键词： Reflection TCO Textured Surface

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Model Associated with the Study of the Degradation Based on the Accelerated Test: A Literature Review

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Open Journal of Applied Sciences 2016年第1期6卷 49-63页

作者： Fatou Dia Nacire Mbengue Omar Ngalla Sarr Moulaye Diagne Omar A. Niasse awa dieye Mor Niang Bassirou Ba Cheikh Sene Laboratory of Semiconductor and Solar Energy Department of Physics Faculty of Science and Techniques University Cheikh Anta Diop Dakar Senegal

Most manufacturers of solar modules guarantee the minimum performance of their modules for 20 to 25 years, and 30-year warranties have been introduced. The warranty typically guarantees that the modules will perform to at least 90% capacity in the first 10 years and to at least 80% in the following 10 - 15 years. Early degradation resulting from design flaws, materials or processing issues is often apparent from startup to the first few years in service. Importantly, many module failures and performance losses are the result of gradual accumulated damage resulting from long-term outdoor exposure in harsh environments, referred. Many of these processes occur on relatively long time scales and the various degradation processes may be chemical, electrical, thermal or mechanical in nature. These are either initiated or accelerated by the combined stresses of the service environment, in particular solar radiation, temperature and moisture, and other stresses such as salt air, wind and snow. Accelerated Life Testing (ALT) test methodology is normally predicated on first being able to reproduce a specific degradation or failure mode without altering it (correlation);and, second, to produce that result in less than real-time acceleration. Degradation and failure may result when an applied stress exceeds material or product strength. This may be a one-time catastrophic event, the result of cyclic fatigue, or a gradual decline in requisite properties due to ageing mechanisms. Engineers in the manufacturing industries have used accelerated test (AT) experiments for many decades. The purpose of AT experiments is to acquire reliability information quickly. Test units of a material, component, subsystem or entire systems are subjected to higher-than-usual levels of one or more accelerating variables such as temperature or stress. Then the AT results are used to predict life of the units at use conditions. The extrapolation is typically justified (correctly or incorrectly) on the

关键词： Degradation Acceleration Factor Arrhenius Relationship Eyring Relationship Inverse Power Relationship Voltage-Stress Photodegradation

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Effects of the Shading Rate on the Electrical Parameters of CIGS-Based Solar Modules

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Energy and Power Engineering 2021年第12期13卷 483-491页

作者： El Hadji Abdoulaye Niass Papa Touty Traore awa dieye Oumar Absatou Niasse Pierre Tavarez Nacire Mbengue Zakaria Makir Zouhair Sofiani Bassirou Ba Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Physics Department Faculty of Science and Technology of Mohmammadia Laboratory Laboratory of Materials and Energy and System Control University Hassan II Casablanca Marocco

The aim of this article is to study the effects of the shading rate on the electrical performance parameters of CIGS PV modules. The study concerns a new flexible CIGS type photovoltaic module with a power of 90 W, manufactured by the company Shenzhen Shine Solar Co., Ltd. This module, reference SN-CIGS90, is tested under the initial conditions to ensure its correct operation and to determine the initial values of the electrical parameters before shading. After this characterization test, the module is exposed under the actual operating conditions of the Renewable Energies Study and Research Center (CERER), located in Dakar, then 4 types of shading are performed with the same mask: partial shading 25% partial shading, 50% partial shading, 75% partial shading, and 100% full shading. The variation rates obtained on the experimental values of the 4 types of shading carried out determine that the shading phenomenon constitutes a factor that influences negatively on the electrical parameters of a CIGS-based PV module. Indeed, for 25% of the surface of the shaded module, there is a reduction of 58.139% of the maximum power and of 60.507% of the efficiency and for shading of 100%, the module loses 84.436% of its maximum power and 84.135% of its performance.

关键词： Modulus Shading Rate Electrical Parameters Mask

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A Severe COVID-19 Infection in Neonates: A Case Report

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Journal of Biosciences and Medicines 2021年第12期9卷 118-123页

作者： Idrissa Demba Ba Mohameth Mbodj Fatim Tall Serigne T. Ndiaye Safietou dieye Mouhamed Fattah Amadou Sow Ndeye F. Sow awa Kane Aita Seck Aminata Mbaye Alioune M. Coundoul Khadim Bop Pape S. Sow Amadou L. Fall Papa M. Faye Ousmane Ndiaye Albert Royer National Children Hospital Dakar Senegal Cheikh Anta DIOP University Dakar Senegal Abass Ndao Hospital Center Dakar Senegal

Coronavirus disease (COVID-19) is a highly contagious infectious disease. First case was reported at the end of 2019 in China. Children and neonate population appears to be relatively free of the virus. We reported a severe and fatal neonate case of COVID-19 in a 22 days old neonate female due to the delta variant strain during the third wave outbreak. She presented with fever, cough, grunting and diarrhea started 5 days before admission. Physical exam’s revealed severe respiratory distress, hypoxia and bilateral pulmonary condensation. PCR test for COVID-19 was positive. Chest X-ray found bilateral infiltrates. Chest CT showed diffuse ground glass images with 75% of lung parenchymal involvement. She was treated with antibiotics, corticostoid, respiratory support (CPAP and oxygen). Death occurred after 15 days of hospitalization in the context of multiple organ failure and pulmonary hypertension.

关键词： COVID-19 Hypoxia Newborn Variant Delta Senegal

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