Inorganic CsPbI₃ perovskite quantum dot (PQD) shows high potential for new-generation photovoltaics due to its outstanding optoelectronic properties. However, the binding-energy-driven ligand exchange of PQDs limits the construction of conductive and stable PQD solids for efficient PQD solar cells (PQDSCs). Herein, protic 2-pentanol with superior ligand solubility is delicately screened from massive solvents to mediate the ligand exchange of PQDs due to its appropriate dielectric constant and acidity, which could maximize the removal of pristine insulating oleylamine ligands from the PQD surface without introducing halogen vacancy defects. Employing tailored short choline ligands and 2-pentanol solvent for the post-treatment of PQD solids, PQDSC yields an efficiency of 16.53%, which is the highest among inorganic PQDSCs. This outstanding performance is attributed to the improved charge carrier transport and surface defect passivation of PQDs. This work provides a feasible platform for tuning the surface properties of PQDs and paves the way for realizing high-performing optoelectronics.

无机CsPbI ₃钙钛矿量子点 (PQD) 因其出色的光电特性而显示出用于新一代光伏的巨大潜力。然而，PQD 的结合能量驱动的配体交换限制了高效 PQD 太阳能电池 (PQDSC) 的导电且稳定的 PQD 固体的构建。在此，具有优异配体溶解度的质子 2-戊醇由于其适当的介电常数和酸度从大量溶剂中精细筛选，以介导 PQD 的配体交换，这可以最大限度地从 PQD 表面去除原始绝缘油胺配体，而不会引入卤素空位缺陷。采用定制的短胆碱配体和 2-戊醇溶剂对 PQD 固体进行后处理，PQDSC 的效率为 16.53%，是无机 PQDSC 中最高的。这种出色的性能归因于 PQD 改进的电荷载流子传输和表面缺陷钝化。这项工作为调整 PQD 的表面特性提供了一个可行的平台，并为实现高性能光电子学铺平了道路。