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Room-temperature current blockade in atomically defined single-cluster junctions.

Giacomo Lovat1, Bonnie Choi2, Daniel W Paley2,3

  • 1Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA.

Nature Nanotechnology
|August 15, 2017
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Summary
This summary is machine-generated.

Researchers developed a single-molecule junction using a cobalt chalcogenide cluster that acts as a switch. This device exhibits current blockade at room temperature, enabling controlled single-electron operations for future nanoelectronic devices.

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Area of Science:

  • Nanotechnology
  • Molecular Electronics
  • Quantum Transport

Background:

  • Single-electron transistors (SETs) are crucial for quantum devices.
  • Fabricating reliable single-charge manipulators is essential for advancing nanoelectronics.

Purpose of the Study:

  • To create and characterize a single-molecule junction for controlled electron transport.
  • To demonstrate single-electron operations using a molecular cluster.

Main Methods:

  • Fabrication of single-molecule junctions using cobalt chalcogenide clusters.
  • Room-temperature electrical transport measurements on thousands of junctions.
  • In situ/ex situ cyclic voltammetry and density functional theory (DFT) calculations.

Main Results:

  • Observed current blockade at room temperature in single-cluster junctions.
  • Demonstrated a current increase of ~600x when the junction is switched on.
  • Unveiled a two-step sequential tunneling process mediated by cluster core states.

Conclusions:

  • Single-molecule junctions with redox-active clusters can achieve controlled single-electron transport.
  • The observed current blockade and switching mechanism are governed by molecular orbital energies.
  • This work paves the way for molecular-scale electronic devices with tunable quantum effects.