Subpicosecond photoinduced electron transfer from conjugated polymers to functionalized fullerenes

We report time-resolved excited state absorption measurements which demonstrate subpicosecond photoinduced electron transfer using soluble derivatives of polyp-phenylene vinyleneas donors blended with a functionalized fullerenemethanofullereneas acceptor

B. Kraabel; Jan C. Hummelen; D. Vacar; D. Moses; N. S. Sariciftci; A. J. Heeger; F. Wudl

2002

Scholarcy highlights

  • Photoinduced electron transfer from conjugated polymers to C60 has been reported. The forward electron transfer from the excited state of the conjugated polymer to the C60 occurs in the subpicosecond time domain. Since the charge transfer is faster than any competing process by several orders of magnitude, the quantum efficiency for charge transfer and charge separation is nearly unity
  • We suggest that the slower decay results from the influence of the bulky, symmetric side groups in BCHA-PPV, which reduce the overlap of the excited state wave functions
  • We have demonstrated that subpicosecond photoinduced charge transfer occurs from both MEH-PPV and BCHA-PPV to a methanofullerene
  • For MEH-PPV/͓6,6͔PCBCa blends, measurements of the decay of the dichroic ratio show that charge transfer occurs within 200 fs with a correspondingly high quantum efficiency for charge transfer
  • The dichroic ratio decay in blends of BCHA-PPV/ ͓6,6͔PCBCa shows a charge transfer time of order 1 ps. In this case, increasing the concentration of6,6͔PCBCa has no effect on the charge transfer time, as shown by the time dependence of the PIA
  • The charge transfer is still more than two orders of magnitude faster than competing recombination processes, so that the quantum efficiency for charge transfer is very high in the BCHA-PPV/͓6,6͔PCBCa as well

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