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Hysteresis‐Suppressed High‐Efficiency Flexible Perovskite Solar Cells Using Solid‐State Ionic‐Liquids for Effective Electron Transport

An efficiency of flexible perovskite solar cells (Pvs-SCs) of 16.09% is achieved, the highest value reported for flexible Pvs-SCs to date. The outstanding performance is attributed to the superior features of alternative electron-transport materials, such as antireflection, a suitable work function, high electron mobility, and a reduced trap-state density of the perovskite material.