Acceptor Energy Offset Manages Ultrafast Recombination Dynamics in Donor-Acceptor Mixtures

Acceptor Energy Offset Manages Ultrafast Recombination Dynamics in Donor-Acceptor Mixtures

We study charge recombination rates in blends of MEH-PPV and a comprehensive set of low molecular-weight fluorine-based acceptors, using visible-pump - IR-probe photoinduced absorption technique. The positions of acceptor's HOMO-LUMO levels are engineered by addition of different chemical subst...

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Veröffentlicht in:EPJ Web of conferences 2013-01, Vol.41, p.5036-np
Hauptverfasser: Pavelyev, V. G., Parashchuk, O. D., Orekhova, T. V., Perepichka, I. F., Paraschuk, D. Yu, van Loosdrecht, P. H. M., Pshenichnikov, M. S.
Format: Artikel
Sprache:eng
Schlagworte:
Blends
Charge
Dynamics
Energy management
Offsets
Polymer blends
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Zusammenfassung:We study charge recombination rates in blends of MEH-PPV and a comprehensive set of low molecular-weight fluorine-based acceptors, using visible-pump - IR-probe photoinduced absorption technique. The positions of acceptor's HOMO-LUMO levels are engineered by addition of different chemical substituents. The results clearly show the exponential scaling of the charge recombination rate with the acceptor LUMO energy. The minimal donor-acceptor LUMO energy difference required to form a CTC state is estimated as ~ 0.25 eV.
ISSN:2100-014X
2100-014X
DOI:10.1051/epjconf/20134105036