Light-responsive organic flashing electron ratchet

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

doi:10.1073/pnas.1705973114

Title: Light-responsive organic flashing electron ratchet

Journal Article · Mon Jul 31 00:00:00 EDT 2017 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1705973114· OSTI ID:1373423

Kedem, Ofer ^[1]; Lau, Bryan ^[2]; Ratner, Mark A. ^[2]; Weiss, Emily A. ^[2]

Center for Bio-Inspired Energy Science, Northwestern University, Chicago, IL 60611-3015,
Center for Bio-Inspired Energy Science, Northwestern University, Chicago, IL 60611-3015,, Department of Chemistry, Northwestern University, Evanston, IL 60208-3113

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 paper 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. Finally, this system is driven with a single unbiased sine wave source, enabling the future use of natural oscillation sources such as electromagnetic radiation.

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Research Organization:: Northwestern Univ., Evanston, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Bio-Inspired Energy Science (CBES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0000989; DMR-1121262; NNCI-1542205

OSTI ID:: 1373423

Alternate ID(s):: OSTI ID: 1465966

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 114 Journal Issue: 33; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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