Precise Control of CsPbBr₃ Perovskite Nanocrystal Growth at Room Temperature: Size Tunability and Synthetic Insights

Room-temperature perovskite nanocrystal syntheses have previously lacked the size tunability attainable through high-temperature methods. Herein, we outline a scalable approach whereby nucleation and growth of CsPbBr3 nanocrystals (NCs) can be decoupled controlled at room temperature by utilizing different ligands. We employed octylphosphonic acid (OPA) ligands to regulate critical radius NC rate. The subsequent addition bulkier didodecyldimethylammonium bromide ligand quenches growth, defining reaction duration. Management these three variables enables precise tuning diameter between 6.8 13.6 nm. photoluminescence quantum yield NCs remains above 80% for all sizes even after thorough antisolvent purification. use hydrogen-bonding OPA enhances confinement effects, characterized strong, well-resolved absorption peaks. Solution solid-state nuclear magnetic resonance spectra confirmed effective removal unbound during purification presence hydrogen-bonded network on surface purified NCs. Overall, this has potential facilitate broad range future endeavors from studies hot carrier dynamics both optically electrically driven device applications.