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Work function of graphene multilayers on SiC(0001)

: Mammadov, S.; Ristein, J.; Krone, J.; Raidel, C.; Wanke, M.; Wiesmann, V.; Speck, F.; Seyller, T.


2D Materials. Online journal 4 (2017), No.1, Art. 015043, 7 pp.
ISSN: 2053-1583
European Commission EC
FP7; 604391; GRAPHENE
Graphene-Based Revolutions in ICT And Beyond
Deutsche Forschungsgemeinschaft DFG
SFB 953 "Synthetic Carbon Allotropes"
Journal Article
Fraunhofer IIS ()

The work function and electronic structure of epitaxial graphene as well as of quasi-freestanding graphene multilayer samples were studied by Kelvin probe and angle resolved photoelectron spectroscopy. The work function converges towards the value of graphite as the number of layers is increased. Thereby, n-type doped epitaxial graphene layers have a work function lower than graphite and p-type doped quasi-freestanding graphene layers exhibit a work function higher than graphite. We explain the behaviour by the filling of the p-bands due to substrate interactions.