Long alkyl‐chain capping ligands are indispensable for preparing stable colloidal quantum dots. However, its insulating feature blocks efficient carrier transport among QDs, leading to inferior performance in light‐emitting diodes (LEDs). The trade‐off between conductivity and colloidal stability of QDs has now been overcome. Methylamine lead bromide (MAPbBr₃) QDs with a conjugated alkyl‐amine, 3‐phenyl‐2‐propen‐1‐amine (PPA), as ligands were prepared. Owing to electron cloud overlapping and the delocalization effect of conjugated molecules, the conductivity and carrier mobility of PPA‐QDs films increased almost 22 times over that of OA‐QD films without compromising colloidal stability and photoluminescence. PPA‐QDs LEDs exhibit a maximum current efficiency of 9.08 cd A⁻¹, which is 8 times of that of OA‐QDs LEDs (1.14 cd A⁻¹). This work provides critical solution for the poor conductivity of QDs in applications of energy‐related devices.

中文翻译：

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功能性共轭配体辅助胶态钙钛矿量子点耦合之间的电荷传输

长烷基链封端配体对于制备稳定的胶体量子点必不可少。但是，其绝缘特性阻碍了QD之间有效的载流子传输，从而导致发光二极管（LED）的性能较差。现在已经克服了量子点的电导率和胶体稳定性之间的权衡。制备了具有共轭烷基胺，3-苯基-2-丙烯-1-胺（PPA）的甲胺溴化铅（MAPbBr ₃）量子点。由于电子云的重叠和共轭分子的离域作用，PPA-QDs薄膜的电导率和载流子迁移率比OA-QD薄膜提高了近22倍，而不会损害胶体稳定性和光致发光。PPA-QDs LED的最大电流效率为9.08 cd A ^-1，这是OA-QDs LED（1.14 cd A ^-1）的8倍。这项工作为能源相关设备应用中QD导电性差的问题提供了关键解决方案。