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Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
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Published on: September 28, 2016

Negative differential resistance in C60-based electronic devices.

Xiaohong Zheng1, Wenchang Lu, Tesfaye A Abtew

  • 1Center for High Performance Simulation and Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-7518, USA.

ACS Nano
|November 19, 2010
PubMed
Summary
This summary is machine-generated.

Molecular assemblies of two C(60) molecules exhibit negative differential resistance (NDR) due to shifting LUMO alignment under bias. This NDR effect in molecular electronics can be tuned by chemical modification and linker length.

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Area of Science:

  • Molecular electronics
  • Nanotechnology
  • Quantum chemistry

Background:

  • Single C(60) molecules have limitations in device applications.
  • Molecular assemblies offer potential for novel electronic properties like negative differential resistance (NDR).

Purpose of the Study:

  • To evaluate the electron transport properties of molecular devices composed of two C(60) molecules connected by an alkane chain.
  • To investigate the mechanisms behind negative differential resistance (NDR) in these systems.
  • To explore methods for tuning NDR characteristics through molecular design.

Main Methods:

  • Utilizing the nonequilibrium Green function (NEGF) technique.
  • Implementing density functional theory (DFT) for calculations.
  • Simulating electron transport through C(60)-alkane-C(60) molecular junctions.

Main Results:

  • Electronic conduction is primarily mediated by the lowest unoccupied molecular orbitals (LUMOs) of C(60).
  • A negative differential resistance (NDR) phenomenon was observed at low bias due to the shifting alignment of LUMOs relative to electrode chemical potentials.
  • The NDR's position and magnitude were found to be tunable via chemical modification of C(60) and variation of the alkane linker length.

Conclusions:

  • Two-C(60) molecular assemblies demonstrate tunable NDR, a key feature for molecular electronic devices.
  • Chemical modifications and linker engineering provide control over NDR characteristics.
  • C(60)-based molecular electronics present a versatile platform for designing advanced molecular devices and sensors.