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The work function of few-layer graphene
O Leenaerts1, B Partoens, F M Peeters
1Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 16, 2016
Summary
The work function of few-layer graphene is largely unaffected by the number of layers. Substrates and dipole layers influence graphene
Area of Science:
- Materials Science
- Surface Science
- Condensed Matter Physics
Background:
- The work function of graphene is crucial for electronic device applications.
- Understanding environmental influences on graphene's electronic properties is essential.
Purpose of the Study:
- To investigate the work function of few-layer graphene (FLG).
- To determine the impact of substrate and molecular dipole layers on FLG work function.
Main Methods:
- Theoretical modeling and experimental measurements were employed.
- The study analyzed graphene with varying numbers of layers.
- Interactions with substrates and dipole layers were simulated and observed.
Main Results:
- Few-layer graphene's work function shows minimal dependence on layer count (approx. 60 meV difference).
- Charge-donating substrates induce an exponential decay in charge distribution, affecting work function.
- Dipole layers alter work function only when positioned between substrate and graphene via charge transfer modulation.
Conclusions:
- The number of layers has a limited effect on few-layer graphene work function.
- Substrate and dipole layer interactions significantly modulate graphene's work function.
- FLG work function is tunable through careful engineering of interfacial layers.
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