Millimeter-Sized Two-Dimensional Molecular Crystalline Semiconductors with Precisely Defined Molecular Layers via Interfacial-Interaction-Modulated Self-Assembly
Millimeter-Sized Two-Dimensional Molecular Crystalline Semiconductors with Precisely Defined Molecular Layers via Interfacial-Interaction-Modulated Self-Assembly
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通过界面相互作用调制自组装具有精确定义的分子层的毫米级二维分子晶体半导体
DOI：
10.1021/acs.jpclett.8b03108
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发表时间：
2018-12-06
影响因子：
5.7
通讯作者：
Li, Yun
中科院分区：
文献类型：
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作者：
Jiang, Sai;Qian, Jun;Li, Yun
有机电子学的新兴领域是通过界面相互作用将分子衬底的界面性质控制在二维极限，这为驱动分子组装成具有精确分子层和大面积均匀的高度有序的二维分子晶体薄膜铺平了道路。在这里，通过利用分子衬底范德华(VDW)相互作用，我们展示了在毫米大小的面积上表现出明确的分子层数的2D有机晶体薄膜的热诱导自组装。双层结构的有机场效应晶体管(OFET)表现出优异的电学性能，最大迁移率可达12.8 cm(2)V-1 S(-1)。此外，我们发现单分子膜可以作为界面分子模板来构建具有良好平衡的双极传输行为的异质结。具有可控分子层和可放大覆盖率的2D分子晶体薄膜的热致自组装能力为实现侧向异质结和超晶格等复杂的电子应用开辟了一条途径。
The newly emerging field in organic electronics is to control the molecule substrate interface properties at a two-dimensional (2D) limit via interfacial interactions, which paves the way for driving the molecular assembly for highly ordered 2D molecular crystalline films with precise molecular layers and large-area uniformity. Here, by exploiting molecule substrate van der Waals (vdW) interactions, we demonstrate thermally induced self-assembly of 2D organic crystalline films exhibiting well-defined molecular layer number over a millimeter-sized area. The organic field-effect transistors (OFETs) with bilayer films show excellent electrical performance with a maximum mobility of 12.8 cm(2) V-1 s(-1). Moreover, we find that the monolayer films can act as interfacial molecular templates to construct heterojunctions with well-balanced ambipolar transport behaviors. The capability of thermally induced self assembly of 2D molecular crystalline films with controllable molecular layers and scale-up coverage opens up a way for realizing complicated electronic applications, such as lateral heterojunctions and superlattices.