Wang Lingling, Zeng Cheng, Xu Hong, Yin Panchao, Chen Dongcheng, Deng Jian, Li Mu, Zheng Nan, Gu Cheng, Ma Yuguang
State Key Laboratory of Luminescent Materials and Devices , Institute of Polymer Optoelectronic Materials and Devices , South China University of Technology , Guangzhou 510640 , P. R. China . Email:
Institute of Nuclear and New Energy Technology , Tsinghua University , Beijing 100084 , P. R. China.
Chem Sci. 2018 Oct 23;10(4):1023-1028. doi: 10.1039/c8sc04255a. eCollection 2019 Jan 28.
Covalent organic frameworks (COFs) have emerged as a tailor-made platform for designing next-generation two-dimensional materials. However, COFs are produced as insoluble and unprocessable solids, which precludes the preparation of thin films for optoelectronic applications. Here, we report designed synthesis of a highly soluble yet crystalline COF material through the regulation of its inter-layer interactions. The resulting COF is remarkably soluble in a variety of organic solvents and forms stable true solutions with retention of its layered structure. These unique features endow the COF with solution processability; high-quality, large-area COF films can be produced on various substrates in a high-throughput and efficient manner, with good control over the film thickness, making this material compatible with a variety of device applications. The films are electrically anisotropic; the intra-layer carrier conduction is inhibited, while the inter-layer carrier migration is outstanding, showing the highest conductivity among all reported COF materials. Our highly soluble and processable COF may open new pathways for realising high-performance COF-based optoelectronic devices with diverse functions.
共价有机框架（COFs）已成为设计下一代二维材料的定制平台。然而，COFs是以不溶性和不可加工的固体形式产生的，这排除了用于光电子应用的薄膜制备。在此，我们报告通过调节其层间相互作用来设计合成一种高度可溶但结晶的COF材料。所得的COF在多种有机溶剂中具有显著的溶解性，并形成稳定的真溶液，同时保留其层状结构。这些独特特性赋予了COF溶液可加工性；高质量、大面积的COF薄膜可以以高通量和高效的方式在各种基板上制备，并且能够很好地控制薄膜厚度，使这种材料与各种器件应用兼容。这些薄膜具有电各向异性；层内载流子传导受到抑制，而层间载流子迁移则很突出，在所有已报道的COF材料中显示出最高的电导率。我们这种高度可溶且可加工的COF可能为实现具有多种功能的高性能基于COF的光电器件开辟新途径。
