Browsing by Author "Choudhury, Md. Shamimul Haque"

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    Modified electrophoretic deposition approach for dye-sensitized solar cell application
    (Center for Research and Publication (CRP), 2024-12) Choudhury, Md. Shamimul Haque
    In this investigation, we are reporting a new electrophoretic deposition approach to prepare a homogeneous, uniform, and crack-free TiO2 photoelectrode for DSSC application. A four-layer deposition technique along with the optimization of the EPD parameters has been applied in this work. To ensure the uniformity of the photoelectrode film, the substrate has been rotated by an angle of 90 degrees before each deposition. The uniformity of the layer is observed by measuring the thickness of the film from each side. The result shows that the proposed technique maintains more uniformity compared to the single-layer deposition and conventional multilayer deposition techniques. It gives relatively a compact layer photoelectrode surface having less amount of crack. The Scanning Electron Microscopy (SEM) image of the photoelectrode surface and photovoltaic performance of the cells confirms that our proposed EPD approach gives a uniform, homogeneous, and compact layer photoelectrode surface with better photovoltaic performance compared to the cells prepared by a conventional single layer or multilayer deposition technique.
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    Optimization of thickness and dye loading time for p25 based dye-sensitized solar cell
    (CRP, International Islamic University Chittagong, 2023-12) Choudhury, Md. Shamimul Haque
    In this study, TiO2-based DSSCs are prepared using the Blade coating technique to find the suitable photoelectrode thickness and optimum dye loading time. The dye loading time is varied from 14 to 26 hours for the photoelectrode thickness of 5 to 30 μm. Photovoltaic performance is measured for the cells under various thicknesses and different dye loading times using a solar simulator. The surface morphology has been observed using a scanning electron microscopy (SEM) image for the photoelectrodes having various thicknesses. The result shows that a smaller thickness of photoelectrode (5 μm) requires relatively less dye loading time of about 14 hours for optimum photoelectric performance. For higher thicknesses (greater than 12 μm), the optimum dye loading time is relatively higher. At 12 μm the maximum solar conversion efficiency has been obtained where the dye loading time was about 18 hours. SEM image confirms a smooth and clean surface morphology for the 12 μm photoelectrode cell compared to other photoelectrode cells.