Bismuth contacts to a MoS2 monolayer are ohmic at room temperature but have high contact resistance, while gold contacts show a Schottky barrier that may be slightly reduced by AFM ironing.
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Study of gold and bismuth electrical contacts to a MoS$_{2}$ monolayer
Bismuth contacts to a MoS2 monolayer are ohmic at room temperature but have high contact resistance, while gold contacts show a Schottky barrier that may be slightly reduced by AFM ironing.