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Graphene on gold: Electron density of states studies by scanning tunneling spectroscopy

2009; American Institute of Physics; Volume: 95; Issue: 11 Linguagem: Inglês

10.1063/1.3231440

1520-8842

Z. Klusek, P. Dąbrowski, P.J. Kowalczyk, W. Kozłowski, W. Olejniczak, Peter Blake, Mirosław Szybowicz, Tomasz Runka,

Surface and Thin Film Phenomena

Graphene devices require electric contacts with metals, particularly with gold. Scanning tunneling spectroscopy studies of electron local density of states performed on mono-, bi-, and trigraphene layer deposited on metallic Au/Cr/SiO2/Si substrate shows that gold substrate causes the Fermi level shift downwards which means that holes are donated by metal substrate to graphene which becomes p-type doped. These experimental results are in good accordance with recently published density function theory calculations.