Me‐4PACz Functionalized MXene for Halide Perovskite Solar Cells

at ≈1000 h for ISOS-O-2. While, all the control devices degraded 55% after 1000 h under ISOS-L and almost 100% after 900 h under ISOS-O-2. Characterization analyses indicate that the efficiency and stability enhancement is due to the improved energy band alignment and charge extraction, to the increased perovskite surface hydrophobicity, and the significant reduction of deep and shallow trap states.