Institute of Materials Research & Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore.
Chem Soc Rev. 2018 May 8;47(9):3241-3264. doi: 10.1039/c8cs00159f.
Since the first isolation of graphene, new classes of two-dimensional (2D) materials have offered fascinating platforms for fundamental science and technology explorations at the nanometer scale. In particular, 2D transition metal dichalcogenides (TMD) such as MoS2 and WSe2 have been intensely investigated due to their unique electronic and optical properties, including tunable optical bandgaps, direct-indirect bandgap crossover, strong spin-orbit coupling, etc., for next-generation flexible nanoelectronics and nanophotonics applications. On the other hand, organics have always been excellent materials for flexible electronics. A plethora of organic molecules, including donors, acceptors, and photosensitive molecules, can be synthesized using low cost and scalable procedures. Marrying the fields of organics and 2D TMDs will bring benefits that are not present in either material alone, enabling even better, multifunctional flexible devices. Central to the realization of such devices is a fundamental understanding of the organic-2D TMD interface. Here, we review the organic-2D TMD interface from both chemical and physical perspectives. We discuss the current understanding of the interfacial interactions between the organic layers and the TMDs, as well as the energy level alignment at the interface, focusing in particular on surface charge transfer and electronic screening effects. Applications from the literature are discussed, especially in optoelectronics and p-n hetero- and homo-junctions. We conclude with an outlook on future scientific and device developments based on organic-2D TMD heterointerfaces.
自石墨烯首次被分离出来以来，新型二维（2D）材料为纳米尺度的基础科学和技术探索提供了迷人的平台。特别是 2D 过渡金属二卤化物（TMD），如 MoS2 和 WSe2，由于其独特的电子和光学性质，包括可调谐的光学带隙、直接-间接带隙交叉、强自旋轨道耦合等，在下一代柔性纳米电子学和纳米光子学应用中受到了强烈的关注。另一方面，有机物一直是柔性电子学的优秀材料。大量的有机分子，包括供体、受体和光敏分子，可以通过低成本和可扩展的程序来合成。将有机物和 2D TMD 的领域结合起来，将带来两种材料单独存在时所没有的好处，从而实现更好的多功能柔性器件。实现这种器件的关键是从化学和物理的角度来理解有机-2D TMD 界面。在这里，我们从化学和物理两个方面综述了有机-2D TMD 界面。我们讨论了有机层与 TMD 之间的界面相互作用以及界面能级排列的当前理解，特别关注表面电荷转移和电子屏蔽效应。我们还讨论了文献中的应用，特别是在光电学和 p-n 异质结和同质结方面的应用。最后，我们根据有机-2D TMD 异质结对未来的科学和器件发展进行了展望。
