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Silicon Carbide Stacking-Order-Induced Doping Variation in Epitaxial Graphene

Momeni Pakdehi, Davood ; Schädlich, Philip ; Nguyen, Thi Thuy Nhung ; Zakharov, Alexei A. LU ; Wundrack, Stefan ; Najafidehaghani, Emad ; Speck, Florian ; Pierz, Klaus ; Seyller, Thomas and Tegenkamp, Christoph , et al. (2020) In Advanced Functional Materials 30(45).
Abstract

Generally, it is supposed that the Fermi level in epitaxial graphene is controlled by two effects: p-type polarization doping induced by the bulk of the hexagonal silicon carbide (SiC)(0001) substrate and overcompensation by donor-like states related to the buffer layer. The presented work is evidence that this effect is also related to the specific underlying SiC terrace. Here a periodic sequence of non-identical SiC terraces is fabricated, which are unambiguously attributed to specific SiC surface terminations. A clear correlation between the SiC termination and the electronic graphene properties is experimentally observed and confirmed by various complementary surface-sensitive methods. This correlation is attributed to a proximity... (More)

Generally, it is supposed that the Fermi level in epitaxial graphene is controlled by two effects: p-type polarization doping induced by the bulk of the hexagonal silicon carbide (SiC)(0001) substrate and overcompensation by donor-like states related to the buffer layer. The presented work is evidence that this effect is also related to the specific underlying SiC terrace. Here a periodic sequence of non-identical SiC terraces is fabricated, which are unambiguously attributed to specific SiC surface terminations. A clear correlation between the SiC termination and the electronic graphene properties is experimentally observed and confirmed by various complementary surface-sensitive methods. This correlation is attributed to a proximity effect of the SiC termination-dependent polarization doping on the overlying graphene layer. These findings open a new approach for a nano-scale doping-engineering by the self-patterning of epitaxial graphene and other 2D layers on dielectric polar substrates.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
epitaxial graphenes, hexagonal silicon carbides, SiC spontaneous polarization, surface-dependent polarization doping
in
Advanced Functional Materials
volume
30
issue
45
article number
2004695
publisher
Wiley-Blackwell
external identifiers
  • scopus:85090759361
ISSN
1616-301X
DOI
10.1002/adfm.202004695
language
English
LU publication?
yes
id
a917415f-7404-4890-8834-7189db3c8fb3
date added to LUP
2020-10-20 12:55:58
date last changed
2022-08-26 06:25:09
@article{a917415f-7404-4890-8834-7189db3c8fb3,
  abstract     = {{<p>Generally, it is supposed that the Fermi level in epitaxial graphene is controlled by two effects: p-type polarization doping induced by the bulk of the hexagonal silicon carbide (SiC)(0001) substrate and overcompensation by donor-like states related to the buffer layer. The presented work is evidence that this effect is also related to the specific underlying SiC terrace. Here a periodic sequence of non-identical SiC terraces is fabricated, which are unambiguously attributed to specific SiC surface terminations. A clear correlation between the SiC termination and the electronic graphene properties is experimentally observed and confirmed by various complementary surface-sensitive methods. This correlation is attributed to a proximity effect of the SiC termination-dependent polarization doping on the overlying graphene layer. These findings open a new approach for a nano-scale doping-engineering by the self-patterning of epitaxial graphene and other 2D layers on dielectric polar substrates.</p>}},
  author       = {{Momeni Pakdehi, Davood and Schädlich, Philip and Nguyen, Thi Thuy Nhung and Zakharov, Alexei A. and Wundrack, Stefan and Najafidehaghani, Emad and Speck, Florian and Pierz, Klaus and Seyller, Thomas and Tegenkamp, Christoph and Schumacher, Hans Werner}},
  issn         = {{1616-301X}},
  keywords     = {{epitaxial graphenes; hexagonal silicon carbides; SiC spontaneous polarization; surface-dependent polarization doping}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{45}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Advanced Functional Materials}},
  title        = {{Silicon Carbide Stacking-Order-Induced Doping Variation in Epitaxial Graphene}},
  url          = {{http://dx.doi.org/10.1002/adfm.202004695}},
  doi          = {{10.1002/adfm.202004695}},
  volume       = {{30}},
  year         = {{2020}},
}