Ambipolar transition voltage spectroscopy: analytical results and experimental agreement

Abstract

This work emphasizes that the transition voltages $V_{t\pm }$ for both bias polarities ($V${\raisebox{1.2ex}{${}_{\stackrel{>}{<}}$}0}) should be used to properly determine the energy offset ${\epsilon }_0$ of the molecular orbital closest to electrodes' Fermi level and the bias asymmetry $\gamma$ in molecular junctions. Accurate analytical formulas are deduced to estimate ${\epsilon }_0$ and $\gamma$ solely in terms of $V_{t\pm }$. These estimates are validated against experiments, by showing that full experimental $I$-$V$-curves measured by Beebe et al [\prl 97, 026801 (2006)] and Tan et al [Appl. Phsy. Lett. 96, 013110 (2010)] for both bias polarities can be excellently reproduced.

References in corpus (2)

• Renormalization of Molecular Electronic Levels at Metal-Molecule Interfaces
• Sources of negative differential resistance in electric nanotransport

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