Metallic and Insulating Adsorbates on Graphene
K. M. McCreary, K. Pi, and R. K. Kawakami
TL;DR
This study compares how metallic Ti and insulating TiO2 adsorbates differently affect graphene's electronic transport, revealing distinct doping and scattering mechanisms.
Contribution
It provides a direct comparison of metallic and insulating adsorbates on graphene, highlighting their contrasting effects on doping and scattering.
Findings
Ti causes n-type doping and reduces mobility
TiO2 reduces doping and introduces short-range scattering
Oxygen exposure converts Ti to TiO2, altering scattering mechanisms
Abstract
We directly compare the effect of metallic titanium (Ti) and insulating titanium dioxide (TiO2) on the transport properties of single layer graphene. The deposition of Ti results in substantial n-type doping and a reduction of graphene mobility by charged impurity scattering. Subsequent exposure to oxygen largely reduces the doping and scattering by converting Ti into TiO2. In addition, we observe evidence for short-range scattering by TiO2 impurities. These results illustrate the contrasting scattering mechanisms for identical spatial distributions of metallic and insulating adsorbates.
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