Bou Ismaïl, Algeria
Bou Ismaïl, Algeria

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El Amrani A.,Silicon Technology Unit | Mahrane A.,Solar Equipment Development Unit | Moussa F.Y.,Silicon Technology Unit | Boukennous Y.,Silicon Technology Unit | El Kechai A.,Silicon Technology Unit
Materials Science in Semiconductor Processing | Year: 2013

We have developed in this study a simple procedure to determine the optimal etching time to passivate the parasitic edge junction of solar cells. The principle of the technique is based on the control of cells electrical characteristics evolution during the gradual elimination of this edge junction. Using plasma technique, the experiments were conducted on monocrystalline and multicrystalline 4 in silicon solar cells round and square in shape respectively. For monocrystalline silicon, the edge junction etch rates of 55.5 nm/min and 90.0-96.5 nm/min has been found for a batch of 20 cells with chemically phosphorus silica glass (PSG) etched and non-etched respectively. The deduced selectivity S=Si/PSG is about 10. For a batch of 100 multicrystalline silicon solar cells, 34 min were sufficient to remove 0.4 μm parasitic junction depth. For the three batches, the difference between the etch rates is explained by the phosphorus concentration and silicon loading effect. As well as for etching uniformities, they are considered good to acceptable. © 2012 Elsevier Ltd.

Chekir N.,Solar Equipment Development Unit | Chekir N.,Sudan University of Science and Technology | Benhabiles O.,Solar Equipment Development Unit | Laoufi N.,Sudan University of Science and Technology | Bentahar F.,Sudan University of Science and Technology
6th International Conference on Thermal Engineering Theory and Applications | Year: 2012

The degradation of linuron (LN) was investigated in an aqueous suspension of TiO 2 using solar energy in tubular reactor. This study was conducted to evaluate the performance of a low-cost tubular photoreactor prototype built along this work and explore the feasibility of this concept as the basis for the solar photocatalytic oxidation. The objective of the study was to assess the influence of various parameters such as initial pesticide concentration, catalyst concentration and pH on the photocatalytic degradation rate of linuron (LN) under UV sunlight. The optimum rate of photodegradation (82.7%) was obtained with a flow rate and a catalyst coating equal to 17 L/mn and 0.5 g/L respectively. And the rate of photodegradation was found to increase when the linuron concentration decreases from 15 to 3mg/L. Adjusting the pH favors the photocatalytic reaction and the best performance (92%) was obtained for pH 5 adjusted. Thus, the UV (sun)/TiO2 photocatalysis process is very efficient and can be suggested for the degradation of linuron in aqueous solution.

Benhabiles O.,Solar Equipment Development Unit | Chekir N.,Solar Equipment Development Unit | Taane W.,Solar Equipment Development Unit
Energy Procedia | Year: 2012

The objective of this study is to characterize a tubular reactor. The experimental set-up consists of a collector with a capacity of 20L consisting 05 glass tubes connected in series. The characterization of the reactor is made using determination of residence time distribution RTD, knowledge of the various parameters of the RTD is an invaluable diagnostic tool that allows realizing the overall operation of the reactor hydrodynamic and detecting anomalies flow. The experimental results show the photéréacteur dysfunctions. From the results of the RTD we can determine the Peclet number Pe and dispersion coefficient Da.Peclet number values are measuring range from 20 to 60, and those of the dispersion coefficient Da are very low between 2 and 8.10-3 m2/s. Knowledge of these values directs us to given an appropriate flow model. © 2012 Published by Elsevier Ltd.

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