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Issue 7, 2010
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Charge separation and (triplet) recombination in diketopyrrolopyrrolefullerene triads

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Synthesis and photophysics of two diketopyrrolopyrrole-based small band gap oligomers, end-capped at both ends with C60 are presented. Upon photoexcitation of the oligomer, ultrafast energy transfer to the fullerene occurs (∼0.5 ps), followed by an electron transfer reaction. Femtosecond transient absorption has been used to determine the rates for charge separation and recombination. Charge separation occurs in the Marcus normal region with a time constant of 18–47 ps and recombination occurs in the inverted regime, with a time constant of 37 ps to 1.5 ns. Both processes are faster in o-dichlorobenzene (ODCB) than in toluene. Analysis of the charge transfer rates by Marcus-Jortner theory leads to the view that the positive charge must be located on the thiophene/dithiophene unit closest to the fullerene. Approximately 14% of the charge transfer state was found to recombine into the low-lying triplet state of the oligomer for the smaller system in ODCB.

Graphical abstract: Charge separation and (triplet) recombination in diketopyrrolopyrrole–fullerene triads

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Publication details

The article was received on 20 Apr 2010, accepted on 18 May 2010 and first published on 07 Jun 2010

Article type: Paper
DOI: 10.1039/C0PP00098A
Photochem. Photobiol. Sci., 2010,9, 1055-1065

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    Charge separation and (triplet) recombination in diketopyrrolopyrrolefullerene triads

    B. P. Karsten, R. K. M. Bouwer, J. C. Hummelen, R. M. Williams and R. A. J. Janssen, Photochem. Photobiol. Sci., 2010, 9, 1055
    DOI: 10.1039/C0PP00098A

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