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Mode-selective vibrational modulation of charge transport in organic electronic devices

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Title: Mode-selective vibrational modulation of charge transport in organic electronic devices
Authors: Bakulin, AA
Lovrincic, R
Yu, X
Selig, O
Bakker, HJ
Rezus, YLA
Nayak, PK
Fonari, A
Coropceanu, V
Brédas, J-L
Cahen, D
Item Type: Journal Article
Abstract: The soft character of organic materials leads to strong coupling between molecular nuclear and electronic dynamics. This coupling opens the way to control charge transport in organic electronic devices by inducing molecular vibrational motions. However, despite encouraging theoretical predictions, experimental realization of such control has remained elusive. Here we demonstrate experimentally that photoconductivity in a model organic optoelectronic device can be controlled by the selective excitation of molecular vibrations. Using an ultrafast infrared laser source to create a coherent superposition of vibrational motions in a pentacene/C60 photoresistor, we observe that excitation of certain modes in the 1500-1700 cm$^{-1}$ region leads to photocurrent enhancement. Excited vibrations affect predominantly trapped carriers. The effect depends on the nature of the vibration and its mode-specific character can be well described by the vibrational modulation of intermolecular electronic couplings. Vibrational control thus presents a new tool for studying electron-phonon coupling and charge dynamics in (bio)molecular materials.
Issue Date: 6-Aug-2015
Date of Acceptance: 23-Jun-2015
URI: http://hdl.handle.net/10044/1/31304
DOI: http://dx.doi.org/10.1038/ncomms8880
ISSN: 2041-1723
Publisher: Nature Publishing Group
Start Page: 7880
End Page: 7880
Journal / Book Title: Nature Communications
Volume: 6
Copyright Statement: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: cond-mat.mtrl-sci
MD Multidisciplinary
Publication Status: Published
Article Number: 7880
Appears in Collections:Chemistry
Faculty of Natural Sciences