Atomically Sharp Interface in an h-BN-epitaxial graphene van der Waals Heterostructure

International audienceStacking various two-dimensional atomic crystals is a feasible approach to creating unique multilayered van der Waals heterostructures with tailored properties. Herein for the first time, we present a controlled preparation of large-area h-BN/graphene heterostructures via a simple chemical deposition of h-BN layers on epitaxial graphene/SiC(0001). Van der Waals forces, which are responsible for the cohesion of the multilayer system, give rise to an abrupt interface without interdiffusion between graphene and h-BN, as shown by X-ray Photoemission Spectroscopy (XPS) and direct observation using scanning and High-Resolution Transmission Electron Microscopy (STEM/HRTEM). The electronic properties of graphene, such as the Dirac cone, remain intact and no significant charge transfer i.e. doping, is observed. These results are supported by Density Functional Theory (DFT) calculations. We demonstrate that the h-BN capped graphene allows the fabrication of vdW heterostructures without altering the electronic properties of graphene

Oral presentation - Work function mapping of functionalized graphene grown on 4H-SiC (0001) substrate

International audienc

Challenges in characterization of low dimensional materials: application to thermoelectrics

International audienceIn this talk, I will discuss the challenges in the characterization of low dimensional materials with an electrical engineering perspective. Techniques such as photoemission and time resolved photoemission will be presented and I will illustrate with some experimental data on nanomaterials e.g., graphene or 2D analogues standalone or in heterostructures formed by the assembly of at least 2 nanomaterials for device purposes. At last, I will focus on temperature controlled thermoelectric characterization and present an instrumentation assembled for that purpose

Graphene and beyond for heterojunctions - Research opportunities

International audienc

Probing of the electronic properties of graphene and 2d analogues: ARPES & PEEM on graphene-based heterostructures

International audienc

Probing and Modulation of the electronic properties of graphene for heterostructures

International audienc