Gong, C., Wang, C., Fan, B., Shi, S., Yuan, H., Meng, X., Li, H., Niazi, M. B. K., Zhang, S., Hu, X., Chen, Y. (2026). Coffee‐Ring‐Engineered Interfacial Layer Enables Fluid‐Locking for Scalable Perovskite Photovoltaics. Advanced Materials. https://doi.org/10.1002/adma.202518582