Surface ligation stage revealed through polarity-dependent fluorescence during perovskite nanocrystal growth
Surface ligation stage revealed through polarity-dependent fluorescence during perovskite nanocrystal growth
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DOI：
10.1039/c9tc06545h
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发表时间：
2020-06-07
影响因子：
6.4
通讯作者：
Wong, Cathy Y.
中科院分区：
文献类型：
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作者：
Sadighian, James C.;Crawford, Michael L.;Wong, Cathy Y.
甲基碘化铅钙钛矿 (MAPbI(3)) 纳米晶体 (NC) 在一系列发光应用中表现出良好的光物理特性。对这些NC的成核和生长过程的全面机械理解仍然难以实现。在 NC 合成过程中测量吸光度和荧光光谱，其动力学受前体溶剂化限制，使用快速采样技术，其中注射器过滤器淬灭 NC 生长。使用极性注射器过滤器分离反应混合物中封盖良好的 NC 的信号，从而能够对表面连接过程进行光谱观察。我们的结果表明，这些 NC 的形成涉及单个成核和生长阶段，然后是末端表面连接阶段。
Methylammonium lead iodide perovskite (MAPbI(3)) nanocrystals (NCs) exhibit favorable photophysics for a range of light emitting applications. A comprehensive mechanistic understanding of the nucleation and growth processes for these NCs is still elusive. Absorbance and fluorescence spectra were measured during a NC synthesis with kinetics limited by precursor solvation using a rapid sampling technique wherein syringe filters quench NC growth. The signal from well-capped NCs in the reaction mixture was isolated by the use of polar syringe filters, enabling spectroscopic observation of the surface ligation process. Our results indicate that the formation of these NCs involves a single stage of nucleation and growth, followed by a terminal surface ligation stage.