Abstract Lead halide perovskite nanocrystals (NCs) have shown exceptional optoelectronic characteristics and photovoltaic performance; however, their instability has limited their use in optoelectronic applications. Herein, we introduce a facile and effective in-situ synthesis strategy to prepare stable core-shell colloidal perovskite nanocrystal-polymer micelle composites (abbr. ap-POSS-PMMA-b-PDMAEMA@CsPbBr3) by using amphiphilic copolymer (abbr. ap-POSS-PMMA-b-PDMAEMA) self-assembled “reverse micelle” templates. The amphiphilic block copolymer with hydrophobic (ap-POSS and polymethylmethacrylate, PMMA) and hydrophilic blocks (poly 2-(dimethylamino)ethyl methacrylate, PDMAEMA) can be regulated to self-assemble into “reverse” micelles. The micelle serves as a confined nanoreactor during perovskite crystallization, which passivates the perovskite surface by forming a multidentate capping shell and yields the formation of multi-nanocubes with size between 6 and 8 nm and a photoluminescence quantum yield (PLQY) that surpasses 60%. Benefitting from femtosecond transient absorption (fs TA) and time-resolved photoluminescence (PL) spectroscopy studies, the excited carrier dynamics of the obtained composites substantiate fewer internal band-gap trap states from micelle-induced CsPbBr3 NCs. The films cast from these composites showed enhanced water-resistant properties as compared to bare NCs and previously reported encapsulated NCs. Therefore, the copolymer “reverse” micelle induced in-situ grown NCs provide a potential approach for further engineering the morphology of NC-based composites and open the door to potential scalable and robust optoelectronic applications.

中文翻译：

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CsPbBr3钙钛矿纳米晶体在多齿共聚物胶束中原位生长的强发光和高度稳定的核壳超结构

摘要 卤化铅钙钛矿纳米晶体 (NCs) 具有优异的光电特性和光伏性能；然而，它们的不稳定性限制了它们在光电应用中的使用。在此，我们介绍了一种简便有效的原位合成策略，通过使用两亲性共聚物（简称 ap-）制备稳定的核壳胶体钙钛矿纳米晶聚合物胶束复合材料（简称 ap-POSS-PMMA-b-PDMAEMA@CsPbBr3）。 POSS-PMMA-b-PDMAEMA）自组装“反胶束”模板。具有疏水性（ap-POSS 和聚甲基丙烯酸甲酯，PMMA）和亲水性嵌段（聚甲基丙烯酸 2-（二甲氨基）乙酯，PDMAEMA）的两亲性嵌段共聚物可以通过调节自组装成“反”胶束。胶束在钙钛矿结晶过程中充当受限的纳米反应器，它通过形成多齿帽壳来钝化钙钛矿表面，并形成尺寸在 6 到 8 nm 之间的多纳米立方体，光致发光量子产率 (PLQY) 超过 60%。受益于飞秒瞬态吸收 (fs TA) 和时间分辨光致发光 (PL) 光谱研究，所得复合材料的激发载流子动力学证实了胶束诱导的 CsPbBr3 NCs 较少的内部带隙陷阱态。与裸 NCs 和先前报道的封装 NCs 相比，由这些复合材料浇铸的薄膜显示出增强的防水性能。所以，