Coulomb blockade and hopping conduction in graphene quantum dots array

Daeha Joung, Lei Zhai, Saiful I. Khondaker

Research output: Contribution to journalArticlepeer-review

71 Scopus citations


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.

Original languageEnglish (US)
Article number115323
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number11
StatePublished - Mar 21 2011
Externally publishedYes


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