Exceptional electron conduction in two-dimensional covalent organic frameworks
Exceptional electron conduction in two-dimensional covalent organic frameworks
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DOI：
10.1016/j.chempr.2021.08.015
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发表时间：
2021-12-09
期刊：
影响因子：
23.5
通讯作者：
Jiang, Donglin
中科院分区：
文献类型：
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作者：
Jin, Enquan;Geng, Keyu;Jiang, Donglin
大多数有机/聚合物半导体是p型半导体，而它们的n型版本在可用性和载流子迁移率方面都受到限制。如何开发高速率的n型有机/聚合物半导体仍然具有挑战性。在这里，我们报告了一种高速率的n型半导体的方法，通过拓扑定向缩聚的传统的p型结与n型异铟-地高辛接头，形成非共轭的四元和六方二维聚合物框架。该聚合物是平面的构象，并显示出平坦的前沿水平，这使得电子能够沿沿着非共轭聚合物主链移动。重叠的面对面堆叠降低了重组能量并大大加强了电子耦合，从而使垂直于聚合物层的带状电子传导成为可能。通过霍尔效应测量实现了记录高达8.2 cm（2）V-1 s（-1）的电子迁移率的设备，而时间和频率分辨的太赫兹光谱显示了13.3 cm（2）V-1 s（-1）的基准迁移率。这些具有卓越流动性的新机械见解为高速率n型有机/聚合物半导体开辟了道路。
Most organic/polymeric semiconductors are p-type semiconductors, whereas their n-type versions are limited in both availability and carrier mobility. How to develop high-rate n-type organic/polymeric semiconductors remains challenging. Here, we report an approach to high-rate n-type semiconductors via topology-directed polycondensation of conventional p-type knots with n-type isoin-digo linkers to form non-conjugated tetragonal and hexagonal two-dimensional polymeric frameworks. The polymers are planar in conformation and show flattened frontier levels, which enable electrons to move along the non-conjugated polymeric backbones. The eclipsed face-to-face stack reduces reorganization energy and greatly strengthens electronic coupling, thus enabling band-like electron conduction perpendicular to polymer layers. A device recording electron mobility as high as 8.2 cm(2) V-1 s(-1) was achieved with Hall effect measurements, whereas time- and frequency-resolved terahertz spectroscopy revealed a benchmark mobility of 13.3 cm(2) V-1 s(-1). These new mechanistic insights with exceptional mobility open the way to high-rate n-type organic/polymeric semiconductors.