One of the great assets of two-dimensional (2D) materials is the possibility of placing different materials on top of each other to form heterostructures with properties tailored to specific application scenarios. However, the quality of the final material stack strongly depends on the electronic coupling between the different materials. Measuring this coupling in a non-destructive way is therefore an important aspect for material development. Researchers from AMO GmbH, RWTH Aachen University and AIXTRON SE have now established a methodology based on Raman spectroscopy for estimating quantitatively the coupling between graphene and molybdenum disulfide (MoS2) in heterostructures up to the mm2-scale.
