Graphene hole/electron condution

[aapirzado]

Hi all,
I want to make graphene based transistor. Can any one please let me know which type of charge transport graphene has? electron or hole?
I would love if you suggest me some references to read more on this or if you share your knowledge and/or experience about this!
Pirzado

 

[Chipmunk]

This review from 2009 might be interesting:

https://arxiv.org/abs/0911.4685

"Current Status of Graphene Transistors" by Max Lemme