Tailored Colloidal Shapes in Precursor Solutions for Efficient Blade‐Coated Perovskite Solar Modules

Abstract Metal halide perovskite solar cells (PSCs) have emerged as one of the most promising candidates for next‐generation photovoltaic technologies. However, perovskite films deposited by blade‐coating usually exhibit inferior film morphology compared to those fabricated by spin‐coating, which hinders the power conversion efficiency (PCE) and stability of the scalable perovskite solar modules (PSMs). Herein, ellipsoidal colloids are tailored in the perovskite precursor solution by incorporating perovskite colloids and polymer additives. Compared to unregulated spherical colloids, the ellipsoidal colloids demonstrate more oriented packing during the blade‐coating process, which is due to the anisotropic driven force from the fluidic flow in the meniscus. As a result of the improved film morphology, the regulated PSCs and PSMs achieve superior PCE of 24.31% and 21.67% (21.37% certified), respectively, for aperture areas of 0.09 and 13.94 cm 2 , and 89% initial PCE after 600 h continuous operation.