The impact of driving force on electron transfer rates in photovoltaic donor-acceptor blends

A.J. Ward, A. Ruseckas, M.M. Kareem, B. Ebenhoch, L.A. Serrano, M. Al-Eid, B. Fitzpatrick, V.M. Rotello, G. Cooke, I.D.W. Samuel

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Abstract

The effect of acceptor energy level on electron transfer rate in blends of the polymer solar cell material poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7) is studied using time-resolved fluorescence. Fast electron transfer in <2 ps is observed for driving force between 0.2 and 0.6 eV and slower electron transfer outside this range. This dependence is described by Marcus theory with a reorganization energy of ≈0.4 eV.
Original languageEnglish
Pages (from-to)2496–2500
JournalAdvanced Materials
Volume27
Issue number15
Early online date10 Mar 2015
DOIs
Publication statusPublished - 17 Apr 2015

Keywords

  • Charge generation
  • Excitonic solar cells
  • Reorganization energy
  • PTB7

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