Coverage dependent work function of graphene on a Cu(111) substrate with intercalated alkali metals

Cook, Brandon G.; Russakoff, Arthur; Varga, Kalman

doi:10.1063/1.4921756

Title: Coverage dependent work function of graphene on a Cu(111) substrate with intercalated alkali metals

Journal Article · Tue May 26 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4921756· OSTI ID:1279422

Cook, Brandon G. ^[1]; Russakoff, Arthur ^[2]; Varga, Kalman ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Vanderbilt Univ., Nashville, TN (United States)

Using first-principles calculations, it is shown that the work function of graphene on copper can be adjusted by varying the concentration of intercalated alkali metals. Using density functional theory, we calculate the modulation of work function when Li, Na, or K are intercalated between graphene and a Cu(111) surface. Furthermore, the physical origins of the change in work function are explained in terms of phenomenological models accounting for the formation and depolarization of interfacial dipoles and the shift in the Fermi-level induced via charge transfer.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1279422

Journal Information:: Applied Physics Letters, Vol. 106, Issue 21; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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36 MATERIALS SCIENCE
graphene
work functions
copper
charge transfer
metal surfaces

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