Blade‐Coating‐Compatible Strategy for Uniform Anchoring of Self‐Assembled Molecules toward Scalable Perovskite Solar Module Fabrication

Abstract Self‐assembled molecules (SAMs) have served as a pivotal interfacial engineering enabler for advancing the performance of perovskite solar cells. However, the spontaneous aggregation of SAMs leads to uneven deposition, particularly in the fabrication of large‐area perovskite solar modules (PSMs) by blade‐coating. Here, a co‐adsorption strategy utilizing 3‐amino‐1‐propanesulfonic acid (3NS) is proposed as a blade‐coating‐compatible strategy to achieve a uniform SAMs anchoring across a 10 × 10 cm 2 substrate. Acting as a co‐adsorbate with SAMs, 3NS leverages synergistic multiple intermolecular interactions—such as electrostatic forces, hydrogen bonding, and cation‐π interactions—to effectively disrupt the aggregation of SAMs, enabling their high‐density anchoring on NiO x substrate. Meanwhile, the 3NS‐SAMs co‐adsorption layer system optimizes interfacial energy level alignment and passivates defects. By virtue of this co‐adsorption strategy, the PSM achieves a champion power conversion efficiency (PCE) of 20.16% (active area: 63.09 cm 2 ). Moreover, the modules retain 87.64% and 72.70% of their initial PCE after 1100 h of ambient aging and 264 h of continuous thermal aging at 80 °C, respectively. This work presents a scalable blade‐coating‐compatible strategy for controlling the deposition of SAMs, advancing the development of high‐performance PSMs.