The impact of driving force on electron transfer rates in photovoltaic donor-acceptor blends
- Ward, Alexander J.
- Ruseckas, Arvydas
- Kareem, Mohanad Mousa
- Ebenhoch, Bernd
- Serrano, Luis A.
- Al-Eid, Manal
- Fitzpatrick, Brian
- Rotello, Vincent M.
- Cooke, Graeme
- Samuel, Ifor D.W.
Publication date
April 2015
DOI Publisher
Wiley ISSN
0935-9648 Language
English Citation count (estimate)
15Abstract
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 less than 2 ps is observed for a driving force between 0.2 and 0.6 eV and the electron transfer is slower outside this range. This dependence is described by Marcus theory with a reorganization energy of ≈0.4 eV
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