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Rapid electron tunneling through oligophenylenevinylene bridges.
H D Sikes1, J F Smalley, S P Dudek
1Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA., Brookhaven National Laboratory, Upton, NY 11973, USA.
Science (New York, N.Y.)
|February 27, 2001
Summary
Electron transfer through oligophenylenevinylene bridges is not limited by electronic coupling up to 28 angstroms. This suggests these bridges are suitable for molecular electronics due to rapid electron tunneling.
Area of Science:
- Physical Chemistry
- Materials Science
- Molecular Electronics
Background:
- Interfacial electron transfer is crucial for molecular electronics.
- Understanding charge transport through molecular bridges is essential for device development.
- Oligophenylenevinylene (OPV) molecules offer potential as conductive bridges.
Purpose of the Study:
- To measure electron transfer rate constants through OPV bridges.
- To investigate the distance dependence of electron transfer.
- To determine the mechanism of charge transport in OPV bridges.
Main Methods:
- Utilized the indirect laser-induced temperature jump technique.
- Measured rate constants for thermal, interfacial electron transfer.
- Employed a gold electrode and a tethered redox species in an aqueous electrolyte.
Main Results:
- Electron transfer rate constants were measured for OPV bridges up to 28 angstroms.
- Rate constants were not limited by electronic coupling for bridges up to 28 angstroms.
- Electron tunneling occurred in less than 20 picoseconds.
Conclusions:
- Electron transfer through OPV bridges up to 28 angstroms is limited by structural reorganization, not electronic coupling.
- Hopping through the bridge was ruled out based on energy level analysis.
- OPV bridges show promise for wiring molecular electronic elements due to efficient electron tunneling.
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