Light-responsive organic flashing electron ratchet

Ofer Kedem, Bryan Lau, Mark A. Ratner*, Emily A. Weiss

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Ratchets are nonequilibrium devices that produce directional motion of particles from nondirectional forces without using a bias, and are responsible for many types of biological transport, which occur with high yield despite strongly damped and noisy environments. Ratchets operate by breaking time-reversal and spatial symmetries in the direction of transport through application of a time-dependent potential with repeating, asymmetric features. This work demonstrates the ratcheting of electrons within a highly scattering organic bulk-heterojunction layer, and within a device architecture that enables the application of arbitrarily shaped oscillating electric potentials. Light is used to modulate the carrier density, which modifies the current with a nonmonotonic response predicted by theory. This system is driven with a single unbiased sine wave source, enabling the future use of natural oscillation sources such as electromagnetic radiation.

Original languageEnglish (US)
Pages (from-to)8698-8703
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number33
StatePublished - Aug 15 2017


  • Charge transport
  • Nonequilibrium
  • Organic semiconductor
  • Ratchet

ASJC Scopus subject areas

  • General


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