Current efforts on lead sulfide quantum dot (PbS QD) solar cells are mostly paid to the device architecture engineering and postsynthetic surface modification, while very rare work regarding the optimization of PbS synthesis is reported. Here, PbS QDs are successfully synthesized using PbO and PbAc₂ · 3H₂O as the lead sources. QD solar cells based on PbAc‐PbS have demonstrated a high power conversion efficiency (PCE) of 10.82% (and independently certificated values of 10.62%), which is significantly higher than the PCE of 9.39% for PbO‐PbS QD based ones. For the first time, systematic investigations are carried out on the effect of lead precursor engineering on the device performance. It is revealed that acetate can act as an efficient capping ligands together with oleic acid, providing better surface coverage and replace some of the harmful hydroxyl (OH) ligands during the synthesis. Then the acetate on the surface can be exchanged by iodide and lead to desired passivation. This work demonstrates that the precursor engineering has great potential in performance improvement. It is also pointed out that the initial synthesis is an often neglected but critical stage and has abundant room for optimization to further improve the quality of the resultant QDs, leading to breakthrough efficiency.

中文翻译：

---

前体工程技术对PbS量子点太阳能电池进行原位钝化

目前在硫化铅量子点（PbS QD）太阳能电池上的努力主要用于设备架构工程和后合成表面改性，而有关PbS合成优化的工作却很少见。在此，使用PbO和PbAc ₂  ·3H ₂成功合成了PbS QD。以O为主要来源。基于PbAc-PbS的QD太阳能电池已显示出10.82％的高功率转换效率（PCE）（并且独立认证的值为10.62％），明显高于基于PbO-PbS QD的PD的9.39％的PCE。首次对铅前驱物工程对器件性能的影响进行了系统的研究。揭示了乙酸盐可以与油酸一起作为有效的封端配体，提供更好的表面覆盖并在合成过程中替代一些有害的羟基（OH）配体。然后，表面上的乙酸盐可被碘化物交换并导致所需的钝化。这项工作表明，前体工程技术在提高性能方面具有巨大潜力。