Minimizing the Buried Interfacial Energy Loss by a Fluorine-Substituted Small Molecule for 25.92%-Efficiency and Stable Inverted Perovskite Solar Cells

Tetrafluorosuccinic acid was introduced into the buried interface to stabilize FA cations, mediate crystal growth of perovskite and reduce the hole-transport barrier, delivering a record efficiency of 25.92% for RbCsFAMA-based perovskite solar cells.