Abstract
Abstract In this work, we study a Bronsted acid, p-Toluenesulfonic acid, as an effective TiO2/perovskite interface layer for high efficiency perovskite solar cell. The results show that p-Toluenesulfonic acid TiO2/perovskite interface layer-modified perovskite solar cell can significantly improve the power conversion efficiency to 19.29% under illumination of AM 1.5G (100 mW cm−2), in contrast to 17.91% of reference perovskite solar cell. It can be concluded that the p-Toluenesulfonic acid TiO2/perovskite interface layer-modified perovskite solar cell exhibits significantly enhanced device performance and reduced interface losses are due to the fact that the p-Toluenesulfonic acid TiO2/perovskite interface layer can induce preferential growth of perovskite crystals to form near-perfect perovskite film with bigger grain sizes and fewer interface defects, and effectively passivate the TiO2/perovskite interface, which favors to balance the electrons and holes transfer.
Published Version
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