99 0

Engineering Electronic Properties of Graphene by Coupling with Si-Rich, Two-Dimensional Islands

Title
Engineering Electronic Properties of Graphene by Coupling with Si-Rich, Two-Dimensional Islands
Author
백운규
Keywords
graphene; silicon islands; van der Waals growth; bandgap engineering; sublattice asymmetry; SINGLE-LAYER GRAPHENE; EPITAXIAL GRAPHENE; FILMS; EELS
Issue Date
2013-01
Publisher
AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Citation
ACS NANO 권: 7 호: 1 페이지: 301-307
Abstract
Recent theoretical and experimental studies demonstrated that breaking of the sublattice symmetry in graphene produces an energy gap at the former Dirac point. We describe the synthesis of graphene sheets decorated with ultrathin, Si-rich two-dimensional (2D) islands (i.e., Gr:Si sheets), in which the electronic property of graphene is modulated by coupling with the Si-islands. Analyses based on transmission electron microscopy, atomic force microscopy, and electron and optical spectroscopies confirmed that Si-islands with thicknesses of similar to 2 to 4 nm and a lateral size of several tens of nm were bonded to graphene via van der Waals interactions. Field-effect transistors (FETs) based on Gr:Si sheets exhibited enhanced transconductance and maximum-to-minimum current level compared to bare-graphene FETs, and their magnitudes gradually increased with increasing coverage of Si layers on the graphene. The temperature dependent current voltage measurements of the Gr:Si sheet showed approximately a 2-fold increase in the resistance by decreasing the temperature from 250 to 10K, which confirmed the opening of the substantial bandgap (similar to 2.5-3.2 meV) in graphene by coupling with Si Islands.
URI
https://pubs.acs.org/doi/10.1021/nn304007xhttp://hdl.handle.net/20.500.11754/41483
ISSN
1936-0851
DOI
10.1021/nn304007x
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE