Laser-synthesized epitaxial graphene.
Owing to its unique electronic properties, graphene has recently attracted wide attention in both the condensed matter physics and microelectronic device communities. Despite intense interest in this material, an industrially scalable graphene synthesis process remains elusive. Here, we demonstrate a high-throughput, low-temperature, spatially controlled and scalable epitaxial graphene (EG) synthesis technique based on laser-induced surface decomposition of the Si-rich face of a SiC single-crystal. We confirm the formation of EG on SiC as a result of excimer laser irradiation by using reflection high-energy electron diffraction (RHEED), Raman spectroscopy, synchrotron-based X-ray diffraction, transmission electron microscopy (TEM), and scanning tunneling microscopy (STM). Laser fluence controls the thickness of the graphene film down to a single monolayer. Laser-synthesized graphene does not display some of the structural characteristics observed in EG grown by conventional thermal decomposition on SiC (0001), such as Bernal stacking and surface reconstruction of the underlying SiC surface.
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.
Sangwon
S
Lee
Michael F
MF
Toney
Wonhee
W
Ko
Jason C
JC
Randel
Hee Joon
HJ
Jung
Ko
K
Munakata
Jesse
J
Lu
Theodore H
TH
Geballe
Malcolm R
MR
Beasley
Robert
R
Sinclair
Hari C
HC
Manoharan
Alberto
A
Salleo