Understanding Charge Transport in Single Molecule of Rhenium(I) Compounds: A Computational Approach

TL;DR

This study uses computational models to explore charge transport mechanisms in Re(I) organometallic molecular junctions, revealing how molecular structure influences electronic behavior and device characteristics.

Contribution

It is the first to investigate Re(I) organometallic compounds in single-molecule electronics, analyzing transport mechanisms and key physical parameters affecting device performance.

Findings

Hopping transport dominates in Re complexes with bipyridine linkages.

Molecular architecture significantly affects charge conduction mechanisms.

Physical parameters like dipole moment influence device characteristics.

Abstract

Understanding electrical characteristics and corresponding transport models at single molecular junctions is crucial. There have been many reports on organic compounds-based single molecular junctions. However, organometallic compounds-based single molecular junctions have not been explored yet. Re(I) organometallic compounds are known to exhibit intriguing photophysical properties scrutinized for photocatalysis, and light-emitting diodes but have not been explored in molecular electronics. In this work, a theoretical model study on the I-V characteristics of two Re(I)-carbonyl complexes bearing Re-P and Re-N-N linkage has been meticulously chosen. Tunneling and hopping transport in Au/Re(I)-complex/Au single-molecule junctions are governed by Landauer-formalism and the Marcus theory, respectively. Interestingly, variations in molecular architecture culminate in notable variations in junction functionality and mechanism of charge conduction. Physical parameters influencing the device characteristics such as dipole moment, molecule-electrode coupling strength, voltage division factor, and temperature have been extensively studied which offers modulation of the characteristics and device design. The dominant hopping current in Re complex bearing bipyridine linkage was found to be responsible for the observed asymmetric electrical (I-V) behavior. Our work paves the way for constructing various organometallic compounds-based molecular junctions to understand electronic functions and the underlying transport mechanisms.