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Dye-sensitized solar cells (DSSCs) have shown promising alternative to Si-based counterparts due to low-cost, abundant raw materials, and non-vacuum processing. Here, we report a solution-based process to create flexible DSSCs on aluminum foils. Mesoporous TiO2 electrode was directly deposited on Al foil through spin casting. After post-thermal annealing, the resultant samples render optical smooth, crack-free, and large nanocrystalline thin films. The as-prepared double-layer porous TiO2 thin film was incorporated with a porphyrin dye followed by a perovskite halide salt Cs2SnI6, as the hole transport material, replacing liquid electrolyte. A transparent conducting plastic sheet was used as the cathodic electrode to complete the solar cell construction. Samples were characterized using X-ray diffraction, SEM, AFM, UV–Vis spectrometer, and current–voltage measurements. A photo-electricity conversion efficiency of 3.74% has been achieved that potentially makes the possibility of scaling up fabrication of all-solid-state flexible solar cells.


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