Abstract
There are numerous defect states in the anatase TiO2 nanoparticles, which are most frequently used as the electron transporting layers in perovskite solar cells (PSCs), resulting in severe charge recombination and poor electron extracted efficiency. Herein, we report a simple and practical way to passivate the surface defects of TiO2 by hydrothermal treating with acetic acid and H2SO4. Modified TiO2 with a high percentage of {101} facets and sulfonic acid functional group is proved to be beneficial for the growth and crystallization of FAMA perovskite film. Furthermore, it can facilitate the electron extraction and inhibit the charge recombination at the perovskite-TiO2 interface. A high PCE of 20.27% has been achieved in our modified TiO2-based PSCs, which is 30% higher than that of control devices under the same condition. Simultaneously, the solar cells display negligible hysteresis, improved device reproducibility and stability. This work provides an efficient approach to engineer the electron transport pathway at perovskite-TiO2 interface.
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