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The Impact of Driving Force on Electron Transfer Rates in Photovoltaic Donor–Acceptor Blends
Author(s) -
Ward Alexander J.,
Ruseckas Arvydas,
Kareem Mohanad Mousa,
Ebenhoch Bernd,
Serrano Luis A.,
AlEid Manal,
Fitzpatrick Brian,
Rotello Vincent M.,
Cooke Graeme,
Samuel Ifor D. W.
Publication year - 2015
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201405623
Subject(s) - materials science , photovoltaic system , acceptor , electron transfer , electron acceptor , electron , photochemistry , chemical physics , nanotechnology , optoelectronics , condensed matter physics , electrical engineering , chemistry , physics , quantum mechanics , engineering
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.