Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 29, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/29/3/035003
Keywords
graphene; work function; ab initio; KPFM
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Funding
- Fonds Wetenschappelijk Onderzoek [FWO-V1]
- Hercules Foundation
- Flemish Government-department EWI
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A theoretical and experimental study of the work function of few-layer graphene is reported. The influence of the number of layers on the work function is investigated in the presence of a substrate, a molecular dipole layer, and combinations of the two. The work function of few-layer graphene is almost independent of the number of layers with only a difference between monolayer and multilayer graphene of about 60 meV. In the presence of a charge-donating substrate the charge distribution is found to decay exponentially away from the substrate and this is directly reflected in the work function of few-layer graphene. A dipole layer changes the work function only when placed in between the substrate and few-layer graphene through a change of the charge transfer between the two.
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