Phosphatidylcholine-mediated regulation of growth kinetics for colloidal synthesis of cesium tin halide nanocrystals
Phosphatidylcholine-mediated regulation of growth kinetics for colloidal synthesis of cesium tin halide nanocrystals
复制标题
DOI：
10.1039/d1nr04618g
复制
发表时间：
2021-09-27
期刊：
影响因子：
6.7
通讯作者：
Sun, Hong-Tao
中科院分区：
文献类型：
--
作者：
Wang, Lu-Ming;Chen, Jia-Kai;Sun, Hong-Tao
卤化铯锡（CsSnX3，其中X是卤素）钙钛矿纳米晶体（NC）是其铅基表兄弟的最具代表性的替代品之一。然而，如何调节胶体CsSnX3 NCs的生长动力学的基本理解仍然缺乏，特别是，表面活性剂在影响其生长动力学的作用仍然不完全理解。在这里，我们报告了一个通用的方法，通过明智的结合封端剂的CsSnX3钙钛矿NC的胶体合成。我们证明，在反应中引入少量的两性离子磷脂酰胆碱是至关重要的调节CsSnX3 NC的生长动力学，否则只会导致形成大尺寸的粉末。基于一系列的实验表征，我们提出，两性离子磷脂酰胆碱和前体之间的中间复合物的形成和磷脂酰胆碱的支链脂肪酸侧链的空间位阻效应可以调节CsSnX3的生长动力学，这使我们能够获得CsSnX3 NCs的发射量子产率有史以来报道的最高值之间。我们使用两性离子封端剂来调节生长动力学的发现可能会激发更多关于合成高质量锡基钙钛矿NC的研究，从而加快其在光电器件中的实际应用。
Cesium tin halide (CsSnX3, where X is halogen) perovskite nanocrystals (NCs) are one of the most representative alternatives to their lead-based cousins. However, a fundamental understanding of how to regulate the growth kinetics of colloidal CsSnX3 NCs is still lacking and, specifically, the role of surfactants in affecting their growth kinetics remains incompletely understood. Here we report a general approach for colloidal synthesis of CsSnX3 perovskite NCs through a judicious combination of capping agents. We demonstrate that introducing a small amount of zwitterionic phosphatidylcholine in the reaction is of vital importance for regulating the growth kinetics of CsSnX3 NCs, which otherwise merely leads to the formation of large-sized powders. Based on a range of experimental characterization, we propose that the formation of intermediate complexes between zwitterionic phosphatidylcholine and the precursors and the steric hindrance effect of branched fatty acid side-chains of phosphatidylcholine can regulate the growth kinetics of CsSnX3, which enables us to obtain CsSnX3 NCs with emission quantum yields among the highest values ever reported. Our finding of using zwitterionic capping agents to regulate the growth kinetics may inspire more research on the synthesis of high-quality tin-based perovskite NCs that could speed up their practical applications in optoelectronic devices.