Title

Coulomb blockade and hopping conduction in graphene quantum dots array

Authors

Authors

D. Joung; L. Zhai;S. I. Khondaker

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Phys. Rev. B

Keywords

CHARGE-TRANSPORT; OXIDE SHEETS; GRAPHITE; TRANSPARENT; MECHANISM; DISORDER; FILMS; Physics, Condensed Matter

Abstract

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.

Journal Title

Physical Review B

Volume

83

Issue/Number

11

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

6

WOS Identifier

WOS:000288594500004

ISSN

1098-0121

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