Inorganic nanoparticles hybridized with π-conjugated polymers were successfully synthesized by the ligand exchange reaction of thiol-end-functionalized regioregular poly(3-hexylthiophene) (P3HT-SH) with lead sulfide (PbS) quantum dots (QDs). The hybrid material (P3HT-SH/PbS-QD) shows good dispersibility in organic solvents even after 6 months due to the decreased intermolecular interaction of PbS nanoparticles coated by highly soluble P3HT. The ultraviolet–visible–near infrared absorption spectra show a clear difference in PbS-QDs hybridized with oleic acid and P3HT-SH, depending on the size of the PbS-QDs. By using transmission electron microscopy, small clusters of PbS-QDs are observed at the nanolevel when hybridized with P3HT-SH, indicating the formation of nanoscale aggregates of PbS-QDs in the hybrid material. Preliminary results for fullerene-free photovoltaic applications showed that P3HT-SH/PbS-QD can deliver almost two times higher power conversion efficiency (PCE) than P3HT when paired with an n-type naphthalene-diimide-based semiconducting polymer (N2200) as the photoactive system. Such an increase in PCE can be attributed to the increased dielectric constant exerted by PbS-QDs, which facilitates charge dissociation. This study not only describes a method for synthesizing PbS-QD-based organic–inorganic hybrids but also reveals an interesting design direction for photovoltaic materials.

中文翻译：

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用于 PbS 量子点分散体的硫醇末端功能化区域规整聚（3-己基噻吩）

通过硫醇末端官能化的区域规整聚（3-己基噻吩）（P3HT-SH）与硫化铅（PbS）量子点（QD）的配体交换反应，成功合成了与π共轭聚合物杂化的无机纳米粒子。由于被高溶解性 P3HT 包覆的 PbS 纳米粒子的分子间相互作用降低，混合材料（P3HT-SH/PbS-QD）即使在 6 个月后仍显示出良好的有机溶剂分散性。紫外-可见-近红外吸收光谱显示，与油酸和 P3HT-SH 杂交的 PbS-QD 存在明显差异，这取决于 PbS-QD 的大小。通过使用透射电子显微镜，当与 P3HT-SH 杂交时，在纳米级观察到小簇 PbS-QD，表明在混合材料中形成了 PbS-QD 的纳米级聚集体。无富勒烯光伏应用的初步结果表明，当与 n 型萘二亚胺基半导体聚合物 (N2200) 配合使用时，P3HT-SH/PbS-QD 的功率转换效率 (PCE) 几乎是 P3HT 的两倍光敏系统。PCE 的这种增加可归因于 PbS-QD 施加的介电常数增加，这促进了电荷离解。这项研究不仅描述了一种合成基于 PbS-QD 的有机-无机杂化物的方法，而且还揭示了一个有趣的光伏材料设计方向。PCE 的这种增加可归因于 PbS-QD 施加的介电常数增加，这促进了电荷离解。这项研究不仅描述了一种合成基于 PbS-QD 的有机-无机杂化物的方法，而且还揭示了一个有趣的光伏材料设计方向。PCE 的这种增加可归因于 PbS-QD 施加的介电常数增加，这促进了电荷离解。这项研究不仅描述了一种合成基于 PbS-QD 的有机-无机杂化物的方法，而且还揭示了一个有趣的光伏材料设计方向。