High electronic couplings of single mesitylene molecular junctions

High electronic couplings of single mesitylene molecular junctions

We report on an experimental analysis of the charge transport properties of single mesitylene (1,3,5-trimethylbenzene) molecular junctions. The electronic conductance and the current-voltage characteristics of mesitylene molecules wired into Au electrodes were measured by a scanning tunnelling microscopy-based break-junction method at room temperature in a liquid environment. We found the molec...

Electronic properties of organic single-molecule junctions

Calculation of Electronic Lifetimes in Molecular Junctions

We study the electronic lifetimes in molecular junctions using the Keldysh nonequilibrium Green function (NEGF) model. It is found that two characteristic time scales which govern the electron tunneling phenomena. One is the electronic lifetime in which electronic energy in the molecular electronic state dissipates into the right/left electrode or vibrational mode, the other is the residence ti...

Measurement of voltage-dependent electronic transport across amine-linked single-molecular-wire junctions.

We measure the conductance and current-voltage characteristics of two amine-terminated molecular wires -- 4,4'-diaminostilbene and bis-(4-aminophenyl)acetylene -- by breaking Au point contacts in a molecular solution at room temperature. Histograms compiled from thousands of measurements show a slight increase in the molecular junction conductance (I/V) as the bias is increased to nearly 450 mV...

Electronic and optical properties of electromigrated molecular junctions.

Electromigrated nanoscale junctions have proven very useful for studying electronic transport at the single-molecule scale. However, confirming that conduction is through precisely the molecule of interest and not some contaminant or metal nanoparticle has remained a persistent challenge, typically requiring a statistical analysis of many devices. We review how transport mechanisms in both elec...