Browsing by Author "Bergaoui, Manel"

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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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    Efficient planar perovskite solar cells using Schiff base complex as sensitizer for TiO2 and ZnO layershe presence of insulin using rGO/ZnO
    (IEEE, 2020) Chouk, Rihab; Haouanoh, Djedjiga; Bergaoui, Manel; Aguir, Chadlia; Tala-Ighil, Razika; Khalfaoui, Mohamed
    In the current work, our attention is focused on designing a Schiff base complex derived from ninhydrin and glycine ligand (NG) with Co (II) metal (Co-NG) as sensitizer for TiO 2 and a ZnO electron transport layers, prepared by sol gel method. The two electrodes and complex are characterized by X-ray diffraction and UV-vis spectroscopy. Furthermore, a Density Functional Theory (DFT) calculation is performed to achieve supplemental insights about the optoelectronic properties of Co-NG complex. As a result, the studied compound exhibits a high molar extinction coefficient equal to 27.5 × 10 3 M -1 cm -1 . Moreover, to predict the possibility of introducing the modified electron transporting layers (ETLs) in PSC devices, the optical properties is tested and strong interactions between the dye and the ETLs are founded. Accordingly, a good efficiency enhancement to 18.94 % using TiO 2 /Co-NG layer and 16.32 % using ZnO/Co-NG, respectively, is achieved.