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Electron Paramagnetic Resonance Tracing of Electronic Transfers in Push-Pull Copolymers/PCBM or Nanocrystal Composites

Abstract : Transfers of photoexcited electrons between poly(thieno[3,4-c]pyrrole-4,6-dione)-based copolymers (push-pull type) and fullerene or nanocrystals were studied by light-induced electron paramagnetic resonance (EPR). EPR tracing methodology has been used: EPR signatures of the various species taking part in the electron-transfer processes were determined and used to monitor potential charge transfers in the studied composites. The EPR tracing method combined with DFT calculations revealed that excited electrons are not only promoted from the HOMO of the polymer but also from its HOMO - 1 and even HOMO - 2, which are either exclusively centered on the push moiety or delocalized over both the push and pull units.
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https://hal.archives-ouvertes.fr/hal-01070725
Contributor : Agnès Bussy <>
Submitted on : Thursday, October 2, 2014 - 10:57:33 AM
Last modification on : Friday, April 17, 2020 - 2:52:02 PM

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Brigitte Pépin-Donat, Chiara Ottone, Christophe Morell, Christian Lombard, Aurélie Lefrançois, et al.. Electron Paramagnetic Resonance Tracing of Electronic Transfers in Push-Pull Copolymers/PCBM or Nanocrystal Composites. Journal of Physical Chemistry C, American Chemical Society, 2014, 118 (35), pp.20647-20660. ⟨10.1021/jp505812q⟩. ⟨hal-01070725⟩

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