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Light-responsive organic flashing electron ratchet.

Ofer Kedem1, Bryan Lau1,2, Mark A Ratner3,2

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|August 2, 2017
PubMed
Summary
This summary is machine-generated.

This study demonstrates electron ratcheting in organic electronics using asymmetric potentials and light modulation. This novel approach enables directional electron flow from unbiased oscillating sources, paving the way for efficient biological transport mechanisms.

Keywords:
charge transportnonequilibriumorganic semiconductorratchet

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Area of Science:

  • Condensed matter physics
  • Organic electronics
  • Biophysics

Background:

  • Ratchets are nonequilibrium devices that generate directional motion from random forces, crucial for biological transport.
  • They function by breaking time-reversal and spatial symmetries using asymmetric potentials.
  • Biological systems utilize ratchets effectively in noisy, damped environments.

Purpose of the Study:

  • To demonstrate electron ratcheting in organic bulk-heterojunction layers.
  • To develop a device architecture for applying arbitrary oscillating electric potentials.
  • To explore light modulation of carrier density for current control.

Main Methods:

  • Fabrication of a device architecture for organic bulk-heterojunctions.
  • Application of arbitrarily shaped oscillating electric potentials.
  • Modulation of carrier density using light to influence current.

Main Results:

  • Successful demonstration of electron ratcheting in a highly scattering organic layer.
  • Observation of a nonmonotonic current response to light-induced carrier density modulation.
  • System driven by a single, unbiased sine wave source.

Conclusions:

  • This work establishes a novel platform for electron ratcheting in organic materials.
  • The system's ability to utilize unbiased oscillating sources opens possibilities for energy harvesting.
  • Potential applications in mimicking biological transport mechanisms with high efficiency.