Photovoltaic Enhancement Strategy of D‐π‐A Molecules in Printable Carbon‐Based Perovskite Solar Cells

To surmount the performance limitations of printable mesoporous perovskite solar cells ( p ‐MPSCs) caused by high defect densities during perovskite crystallization, this study introduces a new D‐π‐A small molecule additive. The molecule has a strong dipole moment and efficient charge transfer, with a triphenylamine donor, thiophene π‐bridge, and rhodanine‐N‐acetic acid acceptor. It accelerates crystallization, passivates defects, and optimizes interactions with perovskite structures. Combined with suitable energy levels and loading concentration, it boosts the power conversion efficiency of p ‐MPSCs from 13.95 to 15.90%. This work expands the range of molecular additives and provides insights into designing high‐performance materials for p ‐MPSCs.