Theory of electrical rectification in a molecular monolayer

Details Theory of electrical rectification in a molecular monolayer Theory of electrical rectification in a molecular monolayer

2011-09-13

arxiv.org/abs/1109.2695v1

Physical Review B 64, 8 (2001) 085405

Physics

Computational Physics

Scientific paper

10.1103/PhysRevB.64.085405

The current-voltage characteristics in Langmuir-Blodgett monolayers of \gamma-hexadecylquinolinium tricyanoquinodimethanide (C16H33Q-3CNQ) sandwiched between Al or Au electrodes is calculated, combining ab initio and self-consistent tight binding techniques. The rectification current depends on the position of the LUMO and HOMO relative to the Fermi levels of the electrodes as in the Aviram-Ratner mechanism, but also on the profile of the electrostatic potential which is extremely sensitive to where the electroactive part of the molecule lies in the monolayer. This second effect can produce rectification in the direction opposite to the Aviram-Ratner prediction.

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