High-mobility band-like charge transport in a semiconducting two-dimensional metal-organic framework
High-mobility band-like charge transport in a semiconducting two-dimensional metal-organic framework
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DOI：
10.1038/s41563-018-0189-z
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发表时间：
2018-11-01
期刊：
影响因子：
41.2
通讯作者：
Canovas, Enrique
中科院分区：
文献类型：
--
作者：
Dong, Renhao;Han, Peng;Canovas, Enrique
金属有机骨架（mof）是一种基于晶体配位聚合物的杂化材料，由有机配体连接的金属离子组成。除了传统应用于气体储存和分离或催化之外，mof中的长程晶体顺序以及有机和无机成分之间的可调谐耦合，导致了导电mof作为新一代电子材料的最新发展。然而，到目前为止，mof中电荷输运的性质仍然难以捉摸。在这里，我们利用高频太赫兹光导和霍尔效应测量证明了半导体，pi-d共轭多孔Fe-3(THT)(2)(NH4)(3)（THT, 2,3,6,7,10,11-三苯六硫醇）二维MOF中的德鲁德型带状输运，其室温迁移率高达类似于220 cm(2) V-1 s（-1）。温度相关的电导率表明，这种迁移率代表了材料的下限，因为迁移率受到杂质散射的限制。这些结果说明了高迁移率半导体mof作为薄膜光电器件活性材料的潜力。
Metal-organic frameworks (MOFs) are hybrid materials based on crystalline coordination polymers that consist of metal ions connected by organic ligands. In addition to the traditional applications in gas storage and separation or catalysis, the long-range crystalline order in MOFs, as well as the tunable coupling between the organic and inorganic constituents, has led to the recent development of electrically conductive MOFs as a new generation of electronic materials. However, to date, the nature of charge transport in the MOFs has remained elusive. Here we demonstrate, using high-frequency terahertz photoconductivity and Hall effect measurements, Drude-type band-like transport in a semiconducting, pi-d conjugated porous Fe-3(THT)(2)(NH4)(3 )(THT, 2,3,6,7,10,11-triphenylenehexathiol) two-dimensional MOF, with a room-temperature mobility up to similar to 220 cm(2) V-1 s(-1). The temperature-dependent conductivity reveals that this mobility represents a lower limit for the material, as mobility is limited by impurity scattering. These results illustrate the potential for high-mobility semiconducting MOFs as active materials in thin-film optoelectronic devices.