|Two steps into the paradigm of all graphene electronics: The effect of substrates and a method to "draw" graphene channels |
Physics and Astronomy
|Jorge Sofo, Penn State|
1:30 PM, Serin 385
Graphene is fascinating, it is two dimensional, it has a giant mobility, and it can be cut into ribbons and other shapes. However, to achieve all this potential into working devices, we need to care about a substrate and a way to support those ribbons. I will present our theoretical work on the effect of amorphous SiO2/Si on the electronic states of graphene and a method to "draw" ribbons into an insulating substrate. According to our results, clean SiO2/Si transfers electrons to graphene due to the presence of occupied surface states with a relatively low work function. This result has been confirmed experimentally. I will also present an idea to use insulating CF as the basic drawing board where graphene ribbons can be generated by removal of fluorine. With this method, circuits and junctions of graphene can be drawn on an insulating monolayer of CF that is three atoms thick. In addition to providing mechanical support for the graphene circuits, the method allows for an efficient way to add or remove carriers from the junctions through substitution in the insulating regions.
Host: Haruo Kojima