期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8880
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资金
- Netherlands Organization for Scientific Research (NWO)
- European Research Council (ERC) under the European Union [639750]
- EU [29866]
- Council for Higher Education (Israel)
- MURI Center on Advanced Molecular Photovoltaics [N00014-14-1-0580]
- Office of Naval Research
- King Abdullah University of Science and Technology (KAUST)
- ONR Global [N62909-15-1-2003]
- Israel Science Foundation Centre of Excellence program
- Grand Centre for Sensors and Security
- Schmidt Minerva Centre for Supramolecular Architecture
- European Research Council (ERC) [639750] Funding Source: European Research Council (ERC)
The soft character of organic materials leads to strong coupling between molecular, nuclear and electronic dynamics. This coupling opens the way to influence charge transport in organic electronic devices by exciting molecular vibrational motions. However, despite encouraging theoretical predictions, experimental realization of such approach has remained elusive. Here we demonstrate experimentally that photoconductivity in a model organic optoelectronic device can be modulated by the selective excitation of molecular vibrations. Using an ultrafast infrared laser source to create a coherent superposition of vibrational motions in a pentacene/C-60 photoresistor, we observe that excitation of certain modes in the 1,500-1,700 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. This presents a new tool for studying electron-phonon coupling and charge dynamics in (bio) molecular materials.
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