有机半导体超薄膜器件的性能往往取决于薄膜在界面处的分子取向和电子结构。目前的研究工作大多关注于器件的宏观电学测量，对界面处的结构与界面态等微观机制认识有限。本申请项目拟在器件运行的过程中系统原位的研究几种典型的有机导电薄膜，如并五苯和噻吩的衍生物，在界面处的电子束缚态、分子偶极、电子能级等微观过程对器件输运特性的影响。通过采用大气和超高真空环境下的静电力显微镜、开尔文探针力显微镜和扫描隧道显微镜并结合光致荧光、拉曼光谱等技术，揭示几种典型的有机半导体超薄膜在不同的介电层和二维结构的界面附近的分子取向、界面结构与输运特性的微观联系，为有机半导体超薄膜器件的制备和性能提升提供实验和理论依据。

The performance and lifetime of devices based on organic semiconductor ultrathin films depend critically on molecular orientation and electronic structures of the interfaces. However, most of the current studies focus on the general effect of transport property, but not provide insight into the mechanism such as the effect of molecular orientation and interfacial state et al. Therefore, it’s essential to comprehensively study the influence of organic crystal structure, electronic binding state, molecular dipole and electronic structure at the interface of some typical organic semiconductors, such as pentacene and thiophene derivatives, on the transport properties of devices. By combing EFM, KPFM and STM under ambient and ultrahigh vacuum environment together with photoluminescence and Raman spectroscopy, we will be able to provide a clear physical picture of the influences of various dielectric layers and 2-D materials, and the interactions of the molecular orientation of organic molecular ultrathin films, interfacial structures and transport properties of devices, which will thus aid in improving the performance of organic electronic devices theoretically and experimentally in the future.