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Asymmetric Electron Transmission Across Asymmetric Alkanethiol Bilayer Junctions by Michael Galperin; Abraham Nitzan; Slawomir Sek; Marcin Majda is a Engineering article available to read on EtoBox.

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Asymmetric I /V curves with respect to the polarity of the voltage bias were observed in the Hg Á/Au junctions containing bilayers of alkanethiols of different chain length. A larger current resulted when a negative bias was applied to the metal carrying a longer chain alkanethiol monolayer. This behavior is simulated using a single molecule junction model, within the frameworks of the extended Hu ̈ckel (EH) model and the nonequilibrium Green's function formalism at the Hartree Fock level (NEGF-HF). Qualitative agreement with the experimental results with respect to the magnitude and sign of this asymmetry is obtained. On the basis of the NEGF-HF calculation, the origin of the effect is suggested to be the asymmetric behavior of the character of the junction highest occupied molecular orbital (HOMO) at opposite biases. This change of character leads to different effective barriers for electron transfer for opposite signs of the voltage drop across the junction.

Who reads Asymmetric Electron Transmission Across Asymmetric Alkanethiol Bilayer Junctions?

Author

Michael Galperin; Abraham Nitzan; Slawomir Sek; Marcin Majda

Publisher

Elsevier ; Elsevier BV (ISSN 1572-6657)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)