Abstract A split-ligand mediated re-precipitation (Split-LMRP) technique for colloidal perovskite quantum dots (QDs) was designed by separately dissolving rich oleic acid (OA) and amine ligands in the synthesis process. OA was used to control the polarity of the nucleation environment and was simultaneously employed as a stabilizer. The Split-LMRP technique allowed purification via the precipitation of QDs from a colloidal solution. The fabrication process is performed under ambient conditions, and the resulting CH3NH3PbX3 (X = Br, I) QDs exhibited strong photoluminescence (PL) emission with a maximum PL quantum yield of 91.5%. The size of the resulting perovskite QDs is tuned in the range of 2–5 nm by varying the ligand concentration and type of halide. We also investigated the charge-transport properties of the synthesized QDs using space-charge-limited current analysis and confirmed stable charge carrier mobility even when the QDs solution was spin-coated on a hydrophilic poly (3,4-ethylenedioxythiophene) polystyrene sulfonate film. Furthermore, the enhanced stability of CH3NH3PbX3 (X = Br, I) QDs improved the power conversion efficiency by the uniform surface passivation of the perovskite active layer which induces efficient exciton generation and charge transport.

中文翻译：

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通过分裂配体再沉淀增强钙钛矿量子点的胶体稳定性，用于光伏应用中的高效双功能中间层

摘要 通过在合成过程中分别溶解富油酸（OA）和胺配体，设计了一种用于胶体钙钛矿量子点（QD）的分裂配体介导的再沉淀（Split-LMRP）技术。OA 用于控制成核环境的极性，同时用作稳定剂。Split-LMRP 技术允许通过从胶体溶液中沉淀 QD 进行纯化。制造过程在环境条件下进行，所得 CH3NH3PbX3 (X = Br, I) 量子点表现出强烈的光致发光 (PL) 发射，最大 PL 量子产率为 91.5%。通过改变配体浓度和卤化物类型，所得钙钛矿 QD 的尺寸可在 2-5 nm 范围内调节。我们还使用空间电荷限制电流分析研究了合成量子点的电荷传输特性，并证实了稳定的电荷载流子迁移率，即使将量子点溶液旋涂在亲水性聚（3,4-亚乙基二氧噻吩）聚苯乙烯磺酸盐薄膜上。此外，CH3NH3PbX3 (X = Br, I) QD 稳定性的增强通过钙钛矿活性层的均匀表面钝化提高了功率转换效率，从而诱导了有效的激子产生和电荷传输。