Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector
Fluorinated Pseudo?Halide Anion Enables >19% Efficiency and Durable Perovskite Quantum Dot Solar Cells
A pseudo?halide, short?chain, and hydrophobicity anion PF6? is introduced to form a ligand shell of FAPbI3 perovskite quantum dot (PQD) to overcome surface defect density, inter?dot transport, and instability challenges, output a record?high efficiency of over 19% and improve long?term stability in PQD solar cells.Metal halide perovskite quantum dots (PQDs), like formamidinium lead triiodide (FAPbI3), hold significant promise for next?generation photovoltaics. Surface manipulation of PQDs has been extensively reported to be crucial to their photovoltaic performance due to the dynamic binding of capping long?chain ligands. In this work, an efficient surface engineering strategy employing a multifunctional fluorinated pseudo?halide anion ligand, hexafluorophosphate (PF6?) is reported for achieving efficient FAPbI3 PQD solar cells. Leveraging its coordination capability, large ionic radius (2.38 Å), and intrinsic hydrophobicity, PF6? simultaneously passivates iodide vacancies, minimizes inter?dot spacing for enhanced electronic coupling, suppresses ion migration, and provides a hydrophobic barrier. By replacing oleate ligands with PF6? in FAPbI3 PQDs, an unprecedented high efficiency of 19.01% (17.19% for a 1 cm2?sized device) is achieved, and enhanced storage and operational stability. These findings will provide insight into the design of robust surface structures and low?trap?states PQD films toward high?efficiency and stable solar cells.
» Publication Date: 15/08/2025
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737
