A New Organic Interlayer Spacer for Stable and Efficient 2D Ruddlesden–Popper Perovskite Solar Cells

ions deliver the power conversion efficiency up to 11.53%, which is ascribed to the simultaneous reductions of charge transfer resistance and defect-induced charge recombination. Moreover, the PTA-based 2D perovskite solar cells demonstrate remarkable environmental and thermal stabilities.