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

Klusek, Z.; Dabrowski, P.; Kowalczyk, P.; Kozlowski, W.; Olejniczak, W.; Blake, P.; Szybowicz, M.; Runka, T.
September 2009
Applied Physics Letters;9/14/2009, Vol. 95 Issue 11, p113114
Academic Journal
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.


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