articleScienceMay 29, 2014GREEN OA

Coherent ultrafast charge transfer in an organic photovoltaic blend

SMSarah M. FalkeCACarlo Andrea RozziDBDaniele BridaMMMargherita MaiuriMAMichele Amato

Carl von Ossietzky Universität Oldenburg · Istituto Nanoscienze · +8 more institutions

PubMed
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Abstract

Blends of conjugated polymers and fullerene derivatives are prototype systems for organic photovoltaic devices. The primary charge-generation mechanism involves a light-induced ultrafast electron transfer from the light-absorbing and electron-donating polymer to the fullerene electron acceptor. Here, we elucidate the initial quantum dynamics of this process. Experimentally, we observed coherent vibrational motion of the fullerene moiety after impulsive optical excitation of the polymer donor. Comparison with first-principle theoretical simulations evidences coherent electron transfer between donor and acceptor and oscillations of the transferred charge with a 25-femtosecond period matching that of the observed…

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11

Topics & keywords

Topics
Keywords
  • Fullerene
  • Femtosecond
  • Delocalized electron
  • Chemical physics
  • Charge (physics)
  • Vibronic coupling
  • Materials science
  • Ultrashort pulse
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