Ethanol‐Assisted Nitrogen‐Blade Coating and Surface Passivation for Efficient and Stable Perovskite Solar Modules

Scaling perovskite solar cells (PSCs) to large‐area modules remains challenging due to efficiency losses from nonuniform films and interfacial defects. Here, we introduce a synergistic strategy combining ethanol‐assisted nitrogen‐blade coating and iodine (4‐fluorophenyl) prop‐2‐en‐1‐amine (4‐FPPA) surface passivation to fabricate efficient and stable large‐area modules. Ethanol incorporation accelerates solvent evaporation during blade coating, enhancing crystallization uniformity and reducing bulk defects. Concurrently, 4‐FPPA posttreatment forms a 2D perovskite capping layer by reacting with residual PbI 2 , suppressing surface defects and nonradiative recombination. The optimized small‐area cells achieve a champion efficiency of 25.11%, while large‐area modules (36 cm 2 ) attain a remarkable 22.06% efficiency. Devices fabricated via dual engineering exhibited superior stability against moisture, oxygen and heat. The unencapsulated modules retained nearly 90% of initial PCE after being exposed to air with a relative humidity of 25% for around 1600 h. This work provides a scalable pathway for high‐performance perovskite photovoltaics.