Mode-selective vibrational control of charge transport in $π$-conjugated molecular materials
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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