Abstract
We investigate the effects of transition metals (TM) on the electronic doping and scattering in graphene using molecular-beam epitaxy combined with in situ transport measurements. The room-temperature deposition of TM onto graphene produces clusters that dope type for all TM investigated (Ti, Fe, and Pt). We also find that the scattering by TM clusters exhibits different behavior compared to Coulomb scattering. At high coverage, Pt films are able to produce doping that is either type or weakly type, which provides experimental evidence for a strong interfacial dipole favoring -type doping as predicted theoretically.
- Received 10 June 2009
DOI:https://doi.org/10.1103/PhysRevB.80.075406
©2009 American Physical Society