Jia Yang

Carbazole‐based self‐assembled monolayers (SAMs) stand out as competitive hole‐transport materials for inverted perovskite solar cells (PSCs), benefiting from their low‐temperature processing and robust operational stability. Nevertheless, intrinsic SAM aggregation and surface hydrophobicity hinder perovskite precursor wetting, trigger uneven buried‐interface nucleation, and worsen interfacial contact, limiting device performance improvement. Herein, two fluorinated phosphonic‐acid molecules, namely FPA‐Ph and FPA‐Py, are utilized to reconstruct the buried SAM/perovskite interface. Both modifiers improve the wettability of the SAM surface and modulate the local interfacial environment via interactions with the SAM and perovskite components. Relative to FPA‐Ph, the extra pyridinic‐N sites in FPA‐Py further boost surface wettability and strengthen Pb ²⁺ coordination, concurrently generating a smoother and more homogeneous SAM layer. These synergistic effects promote the formation of compact perovskite films, favorable interfacial energetics, and optimized carrier dynamics. Consequently, FPA‐Py‐modified PSCs deliver a champion efficiency of 26.53% while possessing exceptional operational stability against high humidity, elevated temperature, and continuous illumination. This work demonstrates hydrophilization‐assisted molecular post‐treatment as an effective approach to buried‐interface reconstruction and provides rational molecular‐design guidance for the scalable fabrication of inverted PSCs.

Selective separation of chalcopyrite and molybdenite remains challenging due to their similar surface properties, which limits the effectiveness of conventional depressants. In this work, we propose a charge-guided adsorption strategy rooted in molecular design and demonstrate its effectiveness using a synthesized lignin-based cationic polymer (EptacLg), which achieves efficient separation by selectively depressing chalcopyrite while leaving molybdenite largely unaffected. Electrochemical and surface analyses reveal that selectivity does not simply depend on whether adsorption occurs but on how the adsorbed layer evolves. A more stable interfacial structure is formed on chalcopyrite, whereas on molybdenite the structure remains weak and quickly stabilizes. This stable layer is associated with reduced surface reactivity and hydrophobicity, accounting for the strong depression of chalcopyrite. By exploiting the difference in surface charge between the two minerals, EptacLg achieves preferential adsorption through electrostatic attraction followed by multipoint interfacial interactions. This work offers a practical alternative to conventional functional-group-specific design, showing that surface charge differences can be amplified through rationally designed polymers for selective separation in sulfide mineral systems.

Herein, a transition-metal-free diphosphination of polyfluoroarenes with diphenylphosphine is disclosed. In the presence of ^tBuOK, various sterically hindered diphosphine ligands and fluorinated diphosphine ligands could be prepared in good to high yields through the C-F cleavage of polyfluoroarenes. This base-promoted direct diphosphination of polyfluoroarenes exhibits high efficiency and broad substrate scope, providing a convenient way for the synthesis of diphosphine ligands.

A base-promoted C–P(O) bond formation method has been developed for the phosphorylation of polyfluoroarenes through selective C–F bond cleavage.

Perovskite solar cells have experienced rapid development in the last few years due to their excellent photovoltaic properties, and their efficiency and stability have attracted widespread attention. Passivating interfacial defects has been universally recognized as an effective performance enhancement strategy for perovskite solar cells (PSCs), but most reported strategies often fail to simultaneously meet the requirements of efficiency and stability. This paper proposes to enhance the passivation function of phosphine oxide by fluorination. On the one hand, P=O is used to form coordination bonds with Pb2+ in perovskite. On the other hand, the strong hydrophobicity of F gives perovskite excellent moisture stability and can hydrogen bond to organic cations in the perovskite. Thanks to its strong chelation with the defect sites, it achieved optimized energy level arrangement, suppressed non-radiative recombination, and excellent operation stability. Consequently, the efficiency of the optimized device increased by 21.6% with a remarkable enhancement of 40 mV in VOC and remained more than 90% of its initial efficiency after aging in air environment for 1000 h, improving both efficiency and stability. This study demonstrates a promising functional modification strategy for constructing efficient, stable, and environmentally friendly PSCs.

Herein, a transition-metal-free phosphorylation of benzyl fluorides with P(O)-H compounds is disclosed. In the presence of t BuOK, various benzyl fluorides react with P(O)-H compounds to produce the corresponding benzyl phosphine oxides, phosphinates, and phosphonates in good to high yields. This base-promoted phosphorylation reaction offers a facile and general strategy for the construction of a C(sp(3))-P bond.