Effect of contact interface configuration on electronic transport in (C20)2-based molecular junctions

► The I-V properties of (C20)2 molecular devices are affected by contact configuration. ► As for the bond contact, metallic behavior in the low bias is observed. ► Varistor-type behavior and nonlinear I-V characteristic in the high bias are found. ► As for the point contact, the Landauer conductance greatly decreases. ► The current is one order of magnitude smaller than that of bond contact.