Recent Progress and Advances of Perovskite Crystallization in Carbon‐Based Printable Mesoscopic Solar Cells

Abstract Carbon‐based printable mesoscopic solar cells (p‐MPSCs) offer significant advantages for industrialization due to their simple fabrication process, low cost, and scalability. Recently, the certified power conversion efficiency of p‐MPSCs has exceeded 22%, drawing considerable attention from the community. However, the key challenge in improving device performance is achieving uniform and high‐quality perovskite crystallization within the mesoporous structure. This review highlights recent advancements in perovskite crystallization for p‐MPSCs, with an emphasis on controlling crystallization kinetics and regulating perovskite morphology within confined mesopores. It first introduces the p‐MPSCs, offering a solid foundation for understanding their behavior. Additionally, the review summarizes the mechanisms of crystal nucleation and growth, explaining how these processes influence the quality and performance of perovskites. Furthermore, commonly applied strategies for enhancing crystallization quality, such as additive engineering, solvent engineering, evaporation controlling, and post‐treatment techniques, are also explored. Finally, the review proposes several potential suggestions aimed at further refining perovskite crystallization, inspiring continued innovation to address current limitations and advance the development of p‐MPSCs.