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Dipolar Noise in Fluorinated Molecular Wires.

Mingyu Jung1, Shashank Shekhar1, Duckhyung Cho1

  • 1Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea.

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|April 23, 2022
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We mapped dipole effects on molecular wire electrical transport and noise. Fluorinated molecules showed enhanced conduction and unique noise correlations, revealing insights into molecular electronics.

Keywords:
dipole-interactionmolecular transportnoiseself-assembled monolayerstunneling and thermionic conduction

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Area of Science:

  • Molecular electronics
  • Condensed matter physics
  • Surface science

Background:

  • Self-assembled monolayers (SAMs) are crucial for molecular electronics.
  • Understanding dipole effects on charge transport is key for device performance.
  • Quantifying noise in molecular junctions is essential for reliable operation.

Purpose of the Study:

  • To develop a method for mapping and quantifying dipole effects on electrical transport and noise in SAMs.
  • To investigate the impact of molecular dipoles on conduction and noise characteristics.
  • To compare the behavior of fluorinated (with dipoles) and hydrogenated (without dipoles) molecular patterns.

Main Methods:

  • Fabrication of SAM patterns using fluorinated and hydrogenated molecules on conducting substrates.
  • Utilizing contact-mode atomic force microscopy with a conducting probe to map current and noise.
  • Analysis of noise power spectral density and its correlation with conductance.

Main Results:

  • Fluorinated molecular junctions exhibited tunneling conduction comparable to longer hydrogenated molecules due to stronger dipoles.
  • A correlation between conductance (G) and noise power spectral density (SI/I2 ∝ G-2) was observed in fluorinated SAMs.
  • Anomalous frequency dependence of noise (SI/I2 ∝ 1/f1.7) was found in fluorinated molecules, attributed to barrier fluctuations.

Conclusions:

  • Dipole formation significantly influences electrical transport and noise in molecular wires.
  • The study provides a direct method to probe mesoscopic transport and resistance fluctuations.
  • Findings offer fundamental insights for designing molecular electronic devices with tailored properties.