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Quantum interference effects at room temperature in OPV-based single-molecule junctions.

Carlos R Arroyo¹, Riccardo Frisenda, Kasper Moth-Poulsen

¹Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft, 2628 CJ, The Netherlands. c.arroyorodriguez@tudelft.nl.

Nanoscale Research Letters

|May 18, 2013

Summary

This summary is machine-generated.

Quantum interference significantly impacts charge transport in single molecules. Researchers observed room temperature interference in oligo(3)-phenylenevinylene (OPV3) derivatives, finding meta-linked OPV3 exhibits lower conductance than para-linked OPV3 due to destructive interference.

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Area of Science:

Molecular electronics
Quantum transport phenomena
Organic semiconductor physics

Background:

Charge transport through single molecules is influenced by quantum interference.
Oligo(3)-phenylenevinylene (OPV3) derivatives are used in molecular junctions.
Position of coupling (para- vs. meta-) affects molecular electronic properties.

Purpose of the Study:

To investigate quantum interference effects in single-molecule junctions of OPV3 derivatives at room temperature.
To compare the charge transport properties of para- and meta-linked OPV3 molecules.
To elucidate the underlying mechanisms of conductance modulation.

Main Methods:

Fabrication of single-molecule junctions using the break-junction technique.
Electrical conductance measurements at room temperature.
Quantum chemical calculations to analyze transmission pathways and interference effects.

Main Results:

Observation of significant quantum interference effects in OPV3 single-molecule junctions.
Single meta-OPV3 molecules showed conductance one order of magnitude lower than para-OPV3 molecules.
Theoretical calculations confirmed constructive interference in para-OPV3 and destructive interference in meta-OPV3.

Conclusions:

Quantum interference effects can be observed at room temperature in OPV3 molecular junctions.
The coupling position (para- vs. meta-) critically determines the conductance of OPV3 molecules.
Interference-induced conductance modulation is governed by the phase differences in molecular orbital transmission coefficients.