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Current rectification by asymmetric molecules: an ab initio study.

Yan-hong Zhou1, Xiao-hong Zheng, Ying Xu

  • 1Department of Physics, Jangxi Normal University, Nanchang 330022, China.

The Journal of Chemical Physics
|January 4, 2007
PubMed
Summary
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This study investigates current rectification in asymmetric molecules, finding that conductance decreases with molecular length. A significant rectification effect, with a ratio up to 38, was observed for specific molecular structures and biases.

Area of Science:

  • Molecular electronics
  • Quantum transport phenomena
  • Computational condensed matter physics

Background:

  • Understanding current rectification in molecular systems is crucial for developing novel electronic devices.
  • Asymmetric molecules are key components for achieving directional charge transport.

Purpose of the Study:

  • To investigate the current rectification effect in an asymmetric molecule (HCOO-C6H4-(CH2)n) interfaced with aluminum electrodes.
  • To explore the influence of molecular length on conductance and rectification properties.

Main Methods:

  • Utilized the ab initio nonequilibrium Green's function (NEGF) method for theoretical calculations.
  • Simulated charge transport through the molecular junction under varying bias conditions.

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Main Results:

  • Observed an exponential decrease in conductance with increasing length (n) of the methylene chain.
  • Demonstrated current rectification, characterized by low current at negative bias and negative differential resistance at positive bias for n>=2.
  • Achieved a significant rectification ratio of approximately 38 for n=5.

Conclusions:

  • The observed rectification effect is attributed to the molecule's intrinsic asymmetry and its coupling with the electrodes.
  • The study highlights the potential of tailored molecular structures for creating efficient single-molecule electronic devices.