Inorganic cesium lead bromide (CsPbBr₃) perovskite nanocrystals (PNCs) have shown promise in optoelectronic applications. A simpler method of synthesizing high-quality PNCs is the ligand-assisted reprecipitation (LARP) method, but it is susceptible to instability. This study used a high-throughput automated experimental platform to explore the growth behaviors and colloidal stability of LARP-synthesized PNCs. The influence of ligands on particle growth and functionalities was systematically explored using two distinctive acid-base pairs. The study found that short-chain ligands cannot make functional PNCs with the desired sizes and shapes, whereas long-chain ligands provide homogeneous and stable PNCs. The study also found that excessive amines or polar antisolvents can cause PNCs to transform into a Cs-rich non-perovskite structure with poorer emission functionalities and larger size distributions. The diffusion of ligands in a reaction system is crucial in determining the structures and functionalities of the PNCs. This study provides detailed guidance on synthesis routes for desired PNCs.

无机溴化铯铅（CsPbBr ₃ ）钙钛矿纳米晶体（PNC）在光电应用中显示出了前景。合成高质量 PNC 的一种更简单的方法是配体辅助再沉淀 (LARP) 方法，但它容易不稳定。本研究使用高通量自动化实验平台来探索 LARP 合成的 PNC 的生长行为和胶体稳定性。使用两种独特的酸碱对系统地探讨了配体对颗粒生长和功能的影响。研究发现，短链配体不能制造具有所需尺寸和形状的功能性PNC，而长链配体可以提供均质且稳定的PNC。研究还发现，过量的胺或极性反溶剂会导致PNC转变为富Cs的非钙钛矿结构，具有较差的发射功能和较大的尺寸分布。反应系统中配体的扩散对于确定 PNC 的结构和功能至关重要。这项研究为所需 PNC 的合成路线提供了详细的指导。