Abstract
Lead ion was incorporated into TiO2 layers prepared on an F-doped tin oxide (FTO) substrate. The resulting electrodes (Pb2+-TiO2/FTO) were sensitized with N719 dye and put to use in dye-sensitized solar cells (DSCs). Owing to the electrostatic attraction between the positively charged TiO2 and the carboxylate anions (–COO−) in the N719 dye, more dye was adsorbed into the Pb2+-TiO2/FTO, which required only 2 h for sensitization, than in a reference TiO2/FTO electrode that was sensitized for 8 h. The power conversion efficiency of a DSC with the Pb2+-TiO2/FTO rose to 10.01 % over the efficiency (9.29 %) of the reference device. It was found that the increased dye adsorption in the Pb2+-TiO2/FTO allowed the cells to more efficiently harvest light and collect electrons, resulting in a higher short-circuit current in the DSC. The larger amount of dye also induced a higher open-circuit voltage in the cell by increasing the total number of photoinjected electrons and prolonging their lifetime.
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