Li, Y., Liu, C., Xiang, W., Cai, H., Guo, Q., Liu, J., Li, J., Ni, J., Zhang, J. (2026). Negative Thermal Expansion Material‐Mediated Stress Engineering for Enhancing the Mechanical and Thermal Stability of Flexible Perovskite Solar Cells. Advanced Materials. https://doi.org/10.1002/adma.73390