The physical and chemical structures of van der Waals interfaces

Chia-Hao Chen^1*

¹National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

* Presenter:Chia-Hao Chen, email:chchen@nsrrc.org.tw

Since the discovery of graphene, the two-dimensional (2D) materials, also known as van der Waals (vdW) materials, attracted enormous attention. One of the reasons is that the electronic structures of the 2D materials spanning from insulator, semiconductor, semimetal, metal, superconductor, to topological insulator. All these abundant electronic structures ensure a wide variety of interesting behaviors while forming heterostructures.

In this regard, by employing optical and scanning probe methods, synchrotron radiation based scanning photoelectron spectromicroscopy, and transport measurement, we focused on studying the interfacial electronic and chemical structures of the vdW heterostructures, hoping to understand the intrinsic properties of the hybrid systems. By understanding the fundamental characteristics to further manipulating the system.

In this presentation, I will show the results of our recent attempts to explore the vdW heterostructure, the vdW/substrate interaction, and the engineering of the vdW semiconductor carrier concentration. The collective efforts will definitely bring us towards the realization of vdW devices in the near future.

Keywords: two-dimensional materials, van der Waals materials, scanning photoelectron spectromicroscopy