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Herein, a mesoporous TiO2 (m-TiO2) layer is customized by tetraethylammonium p-toluenesulfonate (abbreviated as TEATS) the very first time, leading to an important photoelectric conversion efficiency enhancement from 19.14 to 20.69% for Cs0.05MA0.12FA0.83PbI2.55Br0.45 (abbreviated as CsMAFA) meso-PVKSCs. In specific, the obtained champion open-circuit voltage (Voc) is 1.18 V, that will be a record high value for meso-PVKSCs with CsMAFA triple cation blended perovskite. A few dimensions were used to ana