Latest AFM from Han Hongwei of Huazhong University of Science and Technology and Lu Xinhui of the Chinese University of Hong Kong: High-efficiency Carbon-based HTM-free Printable Mesoscopic Perovskite Solar Cells via Multifunctional Fluorinated Molecules

Benefiting from their simple and cost-effective fabrication process, printable mesoscopic perovskite solar cells demonstrate tremendous potential for large-scale production. In printable mesoscopic perovskite solar cells, the material filled in the TiO ₂ and ZrO ₂ The perovskite layer in the mesoporous structure has a thickness of approximately 3 µm. Consequently, the crystallization process of perovskite within the mesoporous architecture is more complex and challenging than that of conventional planar thin films (0.3–0.5 µm). In light of this, on May 2, 2024, Honghong Han from Huazhong University of Science and Technology and Xinhui Lu from the Chinese University of Hong Kong published in Advanced Functional Materials a study on the fabrication of high-efficiency, carbon-based, HTM-free, printable mesoscopic perovskite solar cells using multifunctional fluorinated molecules as additives. These additives enhance perovskite crystallization, thereby boosting device efficiency and operational stability. Specifically, the additive forms strong coordination bonds between its carbonyl groups and undercoordinated Pb²⁺ ions, effectively passivating defects. Moreover, the hydrophobic nature of the fluorinated molecules improves the device’s water resistance and long-term operational stability. Thanks to these synergistic effects, small-area cells (0.1 cm ² ) The power conversion efficiency under 1 sun illumination reaches 20.15%. Large-area modules (56.4 cm) have been fabricated. ² ), with an efficiency of 15.41%.