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Epitaxial graphene on 6H-SiC and Li intercalation

Virojanadara, C.; Watcharinyanon, S.; Zakharov, Alexei LU and Johansson, L. I. (2010) In Physical Review B (Condensed Matter and Materials Physics) 82(20).
Abstract
The influence of lithium (Li) exposures on monolayer graphene grown on the silicon-terminated SiC(0001) surface is investigated using low-energy electron microscopy, photoelectron spectroscopy, and micro-low-energy electron diffraction. After Li deposition, islands or Li droplets are observed on the surface, and are found to coalesce together with time. Formation of a dipole layer at the interface, interpreted to originate from Li-Si bonding, is observed directly after Li deposition, and manifested by a 2 eV shift of the C 1s and Si 2p bulk SiC peaks. This indicates that Li atoms penetrate through the graphene and carbon buffer layer directly after deposition at room temperature since three pi bands are then moreover observed at the K... (More)
The influence of lithium (Li) exposures on monolayer graphene grown on the silicon-terminated SiC(0001) surface is investigated using low-energy electron microscopy, photoelectron spectroscopy, and micro-low-energy electron diffraction. After Li deposition, islands or Li droplets are observed on the surface, and are found to coalesce together with time. Formation of a dipole layer at the interface, interpreted to originate from Li-Si bonding, is observed directly after Li deposition, and manifested by a 2 eV shift of the C 1s and Si 2p bulk SiC peaks. This indicates that Li atoms penetrate through the graphene and carbon buffer layer directly after deposition at room temperature since three pi bands are then moreover observed at the K point, instead of the single pi band for monolayer graphene. The existence of three pi bands is interpreted as a mixture of bilayer and monolayer graphene plus a difference in doping levels due to an uneven distribution of Li atoms. Li gives rise to electron doping of the graphene and results in a lowering of the Dirac point. After annealing to a few hundred degrees Celsius, a more even Li distribution and intercalation is obtained since then two distinct pi bands appear at the K point. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
82
issue
20
publisher
American Physical Society
external identifiers
  • wos:000283840100009
  • scopus:78649724987
ISSN
1098-0121
DOI
10.1103/PhysRevB.82.205402
language
English
LU publication?
yes
id
dec973e4-d0e7-4b23-9eff-9720014889fd (old id 1753024)
date added to LUP
2010-12-29 15:37:50
date last changed
2018-06-24 03:57:20
@article{dec973e4-d0e7-4b23-9eff-9720014889fd,
  abstract     = {The influence of lithium (Li) exposures on monolayer graphene grown on the silicon-terminated SiC(0001) surface is investigated using low-energy electron microscopy, photoelectron spectroscopy, and micro-low-energy electron diffraction. After Li deposition, islands or Li droplets are observed on the surface, and are found to coalesce together with time. Formation of a dipole layer at the interface, interpreted to originate from Li-Si bonding, is observed directly after Li deposition, and manifested by a 2 eV shift of the C 1s and Si 2p bulk SiC peaks. This indicates that Li atoms penetrate through the graphene and carbon buffer layer directly after deposition at room temperature since three pi bands are then moreover observed at the K point, instead of the single pi band for monolayer graphene. The existence of three pi bands is interpreted as a mixture of bilayer and monolayer graphene plus a difference in doping levels due to an uneven distribution of Li atoms. Li gives rise to electron doping of the graphene and results in a lowering of the Dirac point. After annealing to a few hundred degrees Celsius, a more even Li distribution and intercalation is obtained since then two distinct pi bands appear at the K point.},
  articleno    = {205402},
  author       = {Virojanadara, C. and Watcharinyanon, S. and Zakharov, Alexei and Johansson, L. I.},
  issn         = {1098-0121},
  language     = {eng},
  number       = {20},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Epitaxial graphene on 6H-SiC and Li intercalation},
  url          = {http://dx.doi.org/10.1103/PhysRevB.82.205402},
  volume       = {82},
  year         = {2010},
}