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Updated: Jul 19, 2026

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
Published on: December 5, 2015
Metal-molecule contacts and charge transport across monomolecular layers: measurement and theory
J G Kushmerick1, D B Holt, J C Yang
1Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, District of Columbia 20375, USA. kushmerick@nrl.navy.mil
Abstract:
Charge transport studies across molecular length scales under symmetric and asymmetric metal-molecule contact conditions using a simple crossed-wire tunnel junction technique are presented. It is demonstrated that oligo(phenylene ethynylene), a conjugated organic molecule, acts like a molecular wire under symmetric contact conditions, but exhibits characteristics of a molecular diode when the connections are asymmetric. To understand this behavior, we have calculated current-voltage (I-V) characteristics using extended Huckel theory coupled with a Green's function approach. The experimentally observed I-V characteristics are in excellent qualitative agreement with the theory.
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