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Single molecule electronics: increasing dynamic range and switching speed using cross-conjugated species.

David Q Andrews¹, Gemma C Solomon, Richard P Van Duyne

¹Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA. dqandrews@u.northwestern.edu

Journal of the American Chemical Society

|December 5, 2008

Summary

Molecular electronics utilizes cross-conjugated molecules to create high-performance switches and devices. Quantum interference in these molecules enables large dynamic ranges for electronic functionality and novel device applications.

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Area of Science:

Molecular electronics
Quantum chemistry
Nanotechnology

Background:

Active electronic elements are sought at the molecular scale to rival solid-state performance.
Designing molecular switches requires understanding electron transmission dynamics.

Purpose of the Study:

Investigate the ideal design of molecular switches and devices.
Analyze how cross-conjugated molecules enable large dynamic ranges in electron transmission.
Explore applications in molecular transistors and rectifiers.

Main Methods:

Analysis of transmission plots in cross-conjugated molecules.
Computational modeling of electron transport phenomena.
Design and simulation of molecular electronic components.

Main Results:

Cross-conjugated molecules exhibit significant dynamic range in electron transmission probability due to interference.
Controlled manipulation of interference features (width, depth, energy) is demonstrated.
A single molecule transistor showed an 8-order magnitude conductance change.
A molecular rectifier achieved a rectification ratio exceeding 150,000.
Purely electronic negative differential resistance was calculated.

Conclusions:

Quantum interference in cross-conjugated molecules offers a pathway for high-performance molecular electronic devices.
The large dynamic range achieved through electron density changes enables fast and stable switching.
These findings pave the way for novel molecular transistors, rectifiers, and other electronic components.