Coulomb blockade and hopping conduction in graphene quantum dots array
Abbreviated Journal Title
Phys. Rev. B
CHARGE-TRANSPORT; OXIDE SHEETS; GRAPHITE; TRANSPARENT; MECHANISM; DISORDER; FILMS; Physics, Condensed Matter
We show that the low-temperature electron transport properties of chemically functionalized graphene can be explained as sequential tunneling of charges through a two-dimensional array of graphene quantum dots (GQDs). Below 15 K, a total suppression of current due to Coulomb blockade through a GQD array was observed. Temperature-dependent current-gate voltage characteristics show Coulomb oscillations with energy scales of 6.2-10 meV corresponding to GQD sizes of 5-8 nm, while resistance data exhibit an Efros-Shklovskii variable range hopping arising from structural-and size-induced disorder.
Physical Review B
"Coulomb blockade and hopping conduction in graphene quantum dots array" (2011). Faculty Bibliography 2010s. 1447.