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Electric field breakdown in single molecule junctions.

Haixing Li1, Timothy A Su1, Vivian Zhang1

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Summary
This summary is machine-generated.

This study reveals how molecular junction stability is affected by voltage bias. Covalent bonds are robust, while donor-acceptor bonds and Si-Si/Ge-Ge bonds rupture under voltage, with Si-C backbones showing the most stability.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Understanding molecular junction stability is crucial for molecular electronics.
  • High voltage bias can induce rupture in molecular junctions.
  • The role of molecular backbone and linker groups in junction stability requires further investigation.

Purpose of the Study:

  • To investigate the stability and rupture of molecular junctions under high voltage bias at the single molecule/single bond level.
  • To determine how molecular backbone composition (carbon, silicon, germanium) and linker groups influence voltage-induced junction rupture.
  • To establish a novel method for studying electric field breakdown phenomena at the single molecule scale.

Main Methods:

  • Utilized the scanning tunneling microscope-based break-junction technique.
  • Synthesized carbon-, silicon-, and germanium-based molecular wires with aurophilic linker groups.
  • Analyzed junction rupture probability as a function of applied voltage bias.

Main Results:

  • Junctions with covalent sulfur-gold (S-Au) bonds exhibited high robustness and no bias-dependent rupture.
  • Junctions with donor-acceptor bonds ruptured more frequently and showed strong bias dependence.
  • Significant increase in rupture probability above ~1 V for silicon-silicon (Si-Si) and germanium-germanium (Ge-Ge) bonds in methylthiol-terminated disilanes and digermanes.
  • Silicon-carbon (Si-C) backbones demonstrated higher stability under high voltage compared to silicon-silicon (Si-Si) and silicon-oxygen (Si-O) bonds.

Conclusions:

  • Molecular junction stability under high voltage is highly dependent on the type of chemical bond and molecular backbone.
  • Covalent S-Au bonds offer superior stability, while donor-acceptor and homonuclear bonds (Si-Si, Ge-Ge) are susceptible to voltage-induced rupture.
  • Si-C bonds provide enhanced stability in molecular junctions under high electric fields, offering potential for robust molecular electronic devices.