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Abstract
Two kinds of pyridine-based molecular devices with the same narrow ZGNR electrodes show different and distinctive non-equilibrium electron transport properties.
Highlights
In previous work we have explored the in uence of electrodes on the molecular devices based on conjugated pyridine-terminated molecules, and found that narrow zigzag graphene nanoribbons (ZGNRs) show superiority over some metal electrodes, 2D graphene electrodes and wider ZGNR electrodes.[29]
The large current of the device M1 is remarkably coincident with that of the device M2 and a striking low-bias negative differential resistance (NDR) feature appears in both these two devices. This is of particular interest because the NDR effect is indispensable for several electronic components such as the Esaki and resonant tunneling diodes[36,37] and the low bias makes the NDR effect more implemented.[38]
It can be seen that information on both the core molecule and the electrodes must be taken into serious consideration in the design of molecular devices
Summary
Substantial efforts have been devoted experimentally and theoretically to molecular devices based on single molecules, due to their wide applications as molecular switches,[1,2] molecular recti ers,[3,4] eld-effect transistors,[5,6] light-emitting diodes,[7,8] and memory devices.[9,10] Strikingly, the current–voltage (I–V) characteristics of many molecular devices exhibit various excellent and utilizable transport properties, such as negative differential resistance (NDR) effects,[11,12,13,14,15] and rectifying behavior.[16,17] These are fairly prominent and have captured widespread attention because they are essential for logic circuits, memory elements, etc. Of the electrode band structure on transport through three pyridine-linked single molecular junctions by measuring the conductance using Au and Ag electrodes, and they found that the molecule–Au electrode coupling is stronger than the molecule–Ag electrode coupling, from both experiments and calculations.[24] Rauba et al presented DFT calculations for the geometry and quantum conductance of 4,40-bipyridine junctions with Au and Pt electrodes, concentrating on the work function of the electrodes and local d orbital.[25] These valuable studies on the transport properties of pyridine-terminated molecules mainly focus on the conductance characteristics together with equilibrium transport properties, and the adopted electrodes are mostly metal (primarily Au). It is of great interest to study the electron transport of more pyridine-based molecular devices with such ZGNR electrodes
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