28 November 1994 Subpicosecond photo-induced electron transfer from conjugated polymers to C60
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Evidence for ultrafast photoinduced electron transfer from semiconducting polymers to C60 is presented. Upon photoexcitation across the (pi) -(pi) * gap of the conjugated polymer, an electron transfer from the polymer to C60 is initiated. We find that the forward charge transfer occurs in the subpicosecond time domain, and that the charge transferred state is metastable. The ultrafast electron transfer implies that the intrinsic quantum efficiency for photogenerating charged species is close to unity. Hence C60 can serve as an ideal photosensitizing agent for conjugated polymers, as confirmed by picosecond photoconductivity measurements. Steady state photoinduced absorption shows features of the absorption of the C60 anion and the polymer cation, confirming the mechanism of charge transfer from the polymer host to C60.
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Brett Kraabel, Brett Kraabel, Duncan W. McBranch, Duncan W. McBranch, Charles Lee, Charles Lee, Niyazi Serdar Sariciftci, Niyazi Serdar Sariciftci, Alan J. Heeger, Alan J. Heeger, } "Subpicosecond photo-induced electron transfer from conjugated polymers to C60", Proc. SPIE 2284, Fullerenes and Photonics, (28 November 1994); doi: 10.1117/12.196130; https://doi.org/10.1117/12.196130

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