Insights into the Structure and Self-Assembly of Organic-Semiconductor/Quantum-Dot Blends
Insights into the Structure and Self-Assembly of Organic-Semiconductor/Quantum-Dot Blends
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深入了解有机半导体/量子点共混物的结构和自组装
DOI：
10.1002/adfm.202109252
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发表时间：
2021
影响因子：
19
通讯作者：
Toolan D
中科院分区：
文献类型：
--
作者：
Toolan D
控制晶态无机量子点(QD)在有机-QD纳米复合薄膜中的分散性对于广泛的光电子器件来说是至关重要的。在这些纳米复合材料中控制纳米结构的一个有希望的方法是在量子点上使用适当的有机配体，这有助于在电子和结构上使它们与有机主体相容。在这里，作者使用小角X射线和中子散射相结合的方法，证明并量化了这种增容的、电子活性的有机半导体配体物种进入硫化铅的天然油酸配体包层，量子点，以及这种配体负载如何容易控制。此外，原位掠入射宽/小角X射线散射表明，量子点配体的表面化学对纳米复合膜的自组装具有显著的影响，包括小分子结晶和量子点分散对有序/聚集的影响。这种方法表明，在化学结构上与宿主小分子有机基质密切相关的活性配体的掺入程度，在量子点和小分子组分的自组装以及决定体系的最终光电性质方面都发挥着重要作用。
Controlling the dispersibility of crystalline inorganic quantum dots (QD) within organic‐QD nanocomposite films is critical for a wide range of optoelectronic devices. A promising way to control nanoscale structure in these nanocomposites is via the use of appropriate organic ligands on the QD, which help to compatibilize them with the organic host, both electronically and structurally. Here, using combined small‐angle X‐ray and neutron scattering, the authors demonstrate and quantify the incorporation of such a compatibilizing, electronically active, organic semiconductor ligand species into the native oleic acid ligand envelope of lead sulphide, QDs, and how this ligand loading may be easily controlled. Further more, in situ grazing incidence wide/small angle X‐ray scattering demonstrate how QD ligand surface chemistry has a pronounced effect on the self‐assembly of the nanocomposite film in terms of both small‐molecule crystallization and QD dispersion versus ordering/aggregation. The approach demonstrated here shows the important role which the degree of incorporation of an active ligand, closely related in chemical structure to the host small‐molecule organic matrix, plays in both the self‐assembly of the QD and small‐molecule components and in determining the final optoelectronic properties of the system.