Determination of Carrier Type Doped from Metal Contacts to Graphene by Channel-Length-Dependent Shift of Charge Neutrality Points

• DOI: 10.1143/apex.4.035101
• Publication Date: 2011-02-15T07:51:34Z
• Authors: Ryo Nouchi; Tatsuya Saito; Katsumi Tanigaki
• Keywords: Charge carrier

A method for determining the type of charge carrier, electron or hole, which is transferred from metal contacts to graphene, described. The Dirac point found shift toward more negative (positive) gate voltages (hole) doping by shortening interelectrode spacing. accompanied an enhancement electron-hole conductivity asymmetry. Experimentally determined carrier types may be explained in terms work functions modified interactions with graphene.