二硫化钼-石墨烯异质结界面物理及其压电调控研究

近年来，由不同二维材料依靠原子间微弱的范德华力堆叠而成的异质结构受到了广泛的关注，二硫化钼-石墨烯范德华异质结则是其中的典型代表。该异质结有效结合了二硫化钼优异的光电特性和石墨烯超高的面内载流子迁移率。国内外针对二硫化钼-石墨烯异质结的电子结构和光电转化开展了卓有成效的研究。然而，对其界面热学、力学特性的研究还亟待深入。本项目拟针对该异质结的界面热导、电导、力学耦合开展系列实验研究，测量得到其各物理特性的实际参数；探明界面热传输机制及其潜在调控方法，分析电荷在界面的隧穿传输对热导的影响，探究二硫化钼的压电效应对异质结热传输的可能调控作用；明晰范德华相互作用对异质结层间滑动和剪切形变的影响；探讨该异质结的热、力、电和压电特性的相互关联和转化机制，构建该异质结物理特性的完整理论图像，为其在新型热电、压电和柔性传感器件中的应用打下坚实的实验和理论基础，为同类异质结构的研究提供丰富的理论参考。

Recently, the heterostructures formed by the stacking of 2-dimensional materials through weak van der Waal (VDW) forces draw intensive attention. A typical representative is MoS2/graphene VDW heterojunction, which effectively combines the excellent optical-electrical characteristic of MoS2 and the high in-plane carrier mobility of graphene. Fruitful research on the electronic structures and photoelectric conversion of MoS2/graphene heterojunction have been carried out, while there is enormous blank in the study on the thermal and mechanical properties of the interface. This project aims to carry out a series of experimental studies on the interfacial thermal transport, electrical transport and mechanical coupling of the heterojunction, and measure the actual parameters of interface physics. The mechanism of interfacial heat transfer and its potential regulation methods will be explored, the influence of charge tunneling at the interface on thermal transport is going to be analyzed, and the possible modulation on heat transfer in heterojunction of piezoelectric effect of MoS2 will be investigated. The influence of VDW interaction on interlaminar slip and shear deformation is going to be clarified. We will discuss the correlation and transformation mechanism among the thermal, mechanical, electrical and piezoelectric properties of the heterojunction, and construct a comprehensive theoretical image for the physical properties of the heterojunction, which will lay a solid experimental and theoretical foundation for the application of the heterojunction in new thermoelectric, piezoelectric and flexible sensing devices, and provide a rich theoretical reference for the study of similar heterostructures.