Construction of Electron Transfer Network by Self-Assembly of Self-n-Doped Fullerene Ammonium Iodide

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• 作者：Xuan Sun ; Weiwei Chen ; Lijun Liang ; Wei Hu ; Huanhuan Wang ; Zhenfeng Pang ; Yuxun Ye ; Xiurong Hu ; Qi Wang ; Xueqian Kong ; Yizheng Jin ; Ming Lei
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：December 13, 2016
• 年：2016
• 卷：28
• 期：23
• 页码：8726-8731
• 全文大小：591K
• ISSN：1520-5002

文摘

Construction of π-conjugation network in ordered fullerenes by self-assembly remains challenging for improving their optoelectronic performance and developing advanced materials. Here, we present a layered stacking of self-n-doped fullerene ammonium iodide (PCBANI) through a delicate balance among iodide anion–C₆₀ π, electrostatic, and C₆₀ π–π interactions to construct an unprecedented supramolecular system. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and computational modeling are carried out to clarify the structure. Remarkably, the formation of intermolecular iodide anion−π interactions between iodide and the surrounded fullerene cores yields an iodide-linked C₆₀ π–π two-dimensional (2-D) network. Consequently, the ordered and tightly packed fullerenes sandwiching iodide could facilitate electron transfer along the network system. Comparative devices incorporating the disordered films show dramatically decreased current densities and manifest the importance of the π-extended network for electron transfer. This work provides a key strategy to control the packing of ordered electron-transport materials to suppress defect formation. Moreover, engineering self-assembly of self-n-doped fullerenes with novel architectures, such as nanowire, nanotube, and nanoparticle would yield new functionalities that are suitable for photovoltaic devices, nanoelectronics, etc.