Trialkylsulfonium Ligands for the Robust Surface Passivation of Lead Halide Perovskite Nanocrystals

This study introduces a structurally diverse library of long-chain trialkylsulfonium ligands designed to provide surface stabilization of lead halide perovskite nanocrystals (LHP NCs). We evaluate the influence of ligand structure on binding affinity and demonstrate that sulfonium-based ligands offer effective passivation compared to traditional ammonium ligands. Notably, the resulting NCs exhibit exceptional stability at high dilutions and maintain integrity in industrially relevant manufacturing solvents for down-conversion layer production. This work highlights the potential of sulfonium-based ligands to stabilize and produce robust, high-performance perovskite NCs for photonics and optoelectronics.