Abstract
The effect of metal-molecule contacts in molecular junctions is studied based on the analysis of a statistically significant number of devices and a proposed multibarrier tunneling (MBT) model, where a metal-molecule-metal junction is divided into three individual barriers: a molecular-chain body and metal-molecule contacts on either side of molecule. Using the MBT model with the statistical analysis, we could derive and distinguish decay coefficients for contact barriers $({\ensuremath{\beta}}_{1},{\ensuremath{\beta}}_{2})$, contact-dependent and contact-independent decay coefficients (${\ensuremath{\beta}}_{0}$ vs ${\ensuremath{\beta}}_{\text{body}}$), and specific contact resistances in terms of different molecular length and different natures of metal-molecule contacts.
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