Subpicosecond photo-induced electron transfer from conjugated polymers to C60

Brett Kraabel; Duncan W. McBranch; Charles Lee; Niyazi Serdar Sariciftci; Alan J. Heeger

doi:10.1117/12.196130

28 November 1994 Subpicosecond photo-induced electron transfer from conjugated polymers to C60

Brett Kraabel, Duncan W. McBranch, Charles Lee, Niyazi Serdar Sariciftci, Alan J. Heeger

Proceedings Volume 2284, Fullerenes and Photonics; (1994) https://doi.org/10.1117/12.196130
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Brett Kraabel, Duncan W. McBranch, Charles Lee, Niyazi Serdar Sariciftci, and Alan J. Heeger "Subpicosecond photo-induced electron transfer from conjugated polymers to C60", Proc. SPIE 2284, Fullerenes and Photonics, (28 November 1994); https://doi.org/10.1117/12.196130

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