Publications Scientifiques

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Author: search.filters.author.Toubane, MahdiaHas files: Yes

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    Study of Temperature and Concentration Effects for CZTS Layers using Spray Pyrolysis
    (IEEE, 2017) Haouanoh, Djedjiga; TalaIghil, Razika Zaïr; Toubane, Mahdia; Bensouici, Fayçal; Zair, Razika
    In this study, Cu 2 ZnSnS 4 (CZTS) layers were successfully deposited onto glass and silicon substrates by spray pyrolysis technique. The surface morphology, chemical, crystal phase structure and optical properties of (CZTS) thin films were characterized using a scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffractometer (XRD) and UV-visible spectrophotometer. Substrate temperatures and concentrations of precursor effects parameters were investigated. X-ray diffraction showed the formation of kesterite phase. SEM images revealed uniform, smooth, porous, and compact and densely packed morphology. A wide variation in the value of the band gap is observed when we have changed both parameters temperature and concentration.
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    Effects of Thickness and Preheated Temperature on Grains Orientation of 2D-ZnO Nanostructure and their Photocatalytic Activity
    (Springer, 2021) Toubane, Mahdia; Azizi, Assia; Houanoh, D.; Tala-Ighil, R.; Bensouici, F.; Chebout, K.; lamrani, S.; Bououdina, Mohamed
    The effects of pre-heating temperature and thickness of layers on (002) preferred orientation of ZnO thin films and their photocatalytic activity are reported. All films crystallize into a Zincite-type structure. With increasing pre-heating temperature, the evolution from (002) to (101) diffraction peaks indicates change in growth mode of ZnO films. Pre-heating at 100°C is the most favourable for highly oriented ZnO thin films along (002) plane whereas all films deposited with different number of layers are oriented along (101) plane. The crystallite size is found to be in the range 20 - 32 nm. The observed average optical transmittance for these films is higher than 90% in the visible range. The energy band gap decreases with increasing number of layers but increases with increasing pre-heating temperatures. Wettability tests of ZnO thin films surface show a hydrophobic aspect for all films. The film pre-heated at 400°C with 223nm of thickness exhibits the highest degradation of methyl blue dye of 94% with high levels of photostability over five cycle
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    Dye Sensitized TiO2 and ZnO Charge Transport Layers for Efficient Planar Perovskite Solar Cells: Experimental and DFT Insights
    (Springer link, 2019) Chouk, Rihab; Haouanoh, Djedjiga; Aguir, Chadlia; Bergaoui, Manel; Toubane, Mahdia; Al Bensouici, Fayc; Tala-Ighil, Razika
    In this work, the efficiency improvement of planar perovskite solar cells by the introduction of modified electron transport layers (ETLs) is investigated. To this aim, a cobalt complex dye as sensitizer for TiO2, based on Schiff base ligand (Co-NG), and a ZnO layer were prepared by the sol gel method and are tested. The electrodes and the complex are characterized by x-ray diffraction, TGA/DSC and UV–Vis spectroscopy. The photo-physical properties of Co-NG complex investigated at the molecular level show that the dye exhibits good optical behavior with two maxima around 415 nm and 604 nm and a high molar extinction coefficient equal to 27.5 × 103 M−1 cm−1. The influence of sensitization on the optical properties of the ETLs is tested and strong interactions between the dye and the ETLs are found. As a result, the solar cell performances of TiO2/Co-NG and ZnO/Co-NG exhibit a significant efficiency increase equal to 18.94% and 16.32%, respectively, compared to the reference solar cells
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    Influence of Deposition Time on the CdS Thin Films Prepared by a Chemical Bath Deposition (CBD)
    (2020) Haouanoh, D.; Tala-Ighil, Razika; Bensouici, F.; Toubane, Mahdia
    Cadmium sulfide thin layers are frequently used in photovoltaic, especially in the realization of Cu2ZnSnS4 (CZTS) based solar cells as buffer layer. In this work, cadmium sulphide (CdS) thin films have been carried out by using chemical bath deposition (CBD) method. They were deposited onto glass substrates from chemical bath containing cadmium sulfate, thiourea and ammonia at pH = 12. The temperature of the bath was fixed at 60 ºC, and under 150 RPM stirring, the time deposition was varied (10 mn–40 mn). X-ray diffraction revealed the cubic and hexagonal structures formation with secondary phase CdO. AFM images of CdS thin films show that the substrate is covered with granular structures of different size, the root mean square (Rms) value prepared at different time (10 mn, 20 mn, 30 mn and 40 mn) are, 26.05, 25.08, 19.93 and 38.55 nm. High transmission is obtained in the visible and near infra-red.
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    Effect of Er3+ doping on structural, morphological and photocatalytical properties of ZnO thin films
    (IOP Publishing, 2018) Bouhouche, S.; Bensouici, F.; Toubane, Mahdia; Azizi, A.; Otmani, A.; Chebout, K.; Kezzoula, F.; Tala-Ighil, Razika; Bououdina, Mahdia
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    Sol concentration effect on ZnO nanofibers photocatalytic activity synthesized by sol–gel dip coating method
    (IOP Publishing, 2017) Toubane, Mahdia; Tala-Ighil, Razika; Bensouici, F.; Bououdina, M.; Souier, M.; Liu, S.; Cai, W.; Iratni, A.
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    Structural, optical and photocatalytic properties of ZnO nanorods : effect of aging time and number of layers
    (Elsevier, 2016) Toubane, Mahdia; Tala-Ighil, Razika; Bensouici, F.
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    Structural, optical, properties of czts layers deposited by spray pyrolysis technique
    (2015) Tala-Ighil, Razika; Haouanoh, Djedjiga; Toubane, Mahdia; Bensouici, Fayçal; Samantilleke, Anura Priyajith; Slimani, Amel