Speaker
Description
The growth of 2D materials through chemical vapour deposition has been highly optimised in recent years to produce high quality crystalline films, however, a key problem and yet addressed bottleneck is the integration of these 2D materials into fabrication process flows. Here we focus on dry transfer as a simple and flexible method of 2D material application. By treating the crystallographic orientation of the catalyst as a parameter to be continuously varied we find not the best catalyst for growth, but the best catalyst that enables single crystal graphene films to be transferred well. By simultaneously studying 1000s of graphene islands on over 100 crystallographic orientations, we investigate how the interface behaves with intercalation and build on previous knowledge[1]. Using Raman, electron/optical microscopy and ellipsometry measurements we produce systematic studies of the epitaxial relationships/crystallinity of graphene on these catalyst orientations, the ability to remove graphene from the catalyst and the quality of the graphene once transferred. From these we can draw a crystallographic map that leads to the ideal catalyst for the application of 2D materials. We then demonstrate the ability to rapidly produce large areas of the desired single crystal catalyst[2], producing a route to easily transferrable large area continuous 2D films that remain high quality once transferred.
[1] Braeuninger-Weimer, P et al. Chem. Mater. 2020, ASAP.
[2] Burton, O. J. et al. ACS Nano 2020, 14, 13593–13601.
| Speaker Country | United Kingdom |
|---|