Jiang Sai, Qian Jun, Duan Yiwei, Wang Hengyuan, Guo Jianhang, Guo Yu, Liu Xinyi, Wang Qijing, Shi Yi, Li Yun
National Laboratory of Solid-State Microstructures, School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures , Nanjing University , Nanjing , Jiangsu 210093 , P. R. China.
Nanjing Foreign Language School , Nanjing , Jiangsu 210008 , P. R. China.
J Phys Chem Lett. 2018 Dec 6;9(23):6755-6760. doi: 10.1021/acs.jpclett.8b03108. Epub 2018 Nov 13.
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 V s. 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.
有机电子学中新兴的领域是通过界面相互作用在二维（2D）极限下控制分子-衬底界面性质，这为驱动分子组装以形成具有精确分子层数和大面积均匀性的高度有序二维分子晶体薄膜铺平了道路。在此，通过利用分子-衬底范德华（vdW）相互作用，我们展示了二维有机晶体薄膜的热诱导自组装，其在毫米尺寸的区域上表现出明确的分子层数。具有双层薄膜的有机场效应晶体管（OFET）表现出优异的电学性能，最大迁移率为12.8 cm V s。此外，我们发现单层薄膜可以作为界面分子模板来构建具有平衡双极性传输行为的异质结。二维分子晶体薄膜具有可控分子层数和扩大覆盖范围的热诱导自组装能力为实现复杂的电子应用，如横向异质结和超晶格开辟了一条道路。
