Abstract

In this study, the B3LYP hybrid density functional theory was used to investigate the electromechanical characteristics of C70 fullerene with and without point charges to model the effect of the surface of the gate electrode in a C70 single-electron transistor (SET). To understand electron tunneling through C70 fullerene species in a single-C70 transistor, descriptors of geometrical atomic structures and frontier molecular orbitals were analyzed. The findings regarding the node planes of the lowest unoccupied molecular orbitals (LUMOs) of C70 and both the highest occupied molecular orbitals (HOMOs) and the LUMO of the C70 anion suggest that electron tunneling of pristine C70 prolate spheroidal fullerene could be better in the major axis orientation when facing the gate electrode than in the major (longer) axis orientation when facing the Au source and drain electrodes. In addition, we explored the effect on the geometrical atomic structure of C70 by a single-electron addition, in which the maximum change for the distance between two carbon sites of C70 is 0.02 Å.

Highlights

  • Using molecules as electronic components in single-molecule transistors (SMTs) is a powerful new direction in the field of nanometer-scale systems [1,2]

  • The emerging field of molecular electronics (ME) based on single molecules offers a platform for the further miniaturization of devices that can respond to various external excitations

  • Molecular electronic systems are ideal for the study of charge transport on a single-molecule scale

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Summary

Introduction

Using molecules as electronic components in single-molecule transistors (SMTs) is a powerful new direction in the field of nanometer-scale systems [1,2]. The emerging field of molecular electronics (ME) based on single molecules offers a platform for the further miniaturization of devices that can respond to various external excitations. Molecular electronic systems are ideal for the study of charge transport on a single-molecule scale. The design of functional molecular devices has moved the study of metal–molecule–metal junctions beyond classic electronic transport characterization. Changes in the conductance of single-molecule junctions in response to various external stimuli is crucial regarding the study of single-molecule electronic devices that can be combined to provide multiple functionalities [3,4,5]. Studying transport through a single molecule in a single-electron transistor (SET)

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