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Wiley, Advanced Materials, 15(27), p. 2496-2500, 2015

DOI: 10.1002/adma.201405623

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The Impact of Driving Force on Electron Transfer Rates in Photovoltaic Donor-Acceptor Blends

Journal article published in 2015 by Alexander J. Ward, Arvydas Ruseckas ORCID, Mohanad Mousa Kareem, Bernd Ebenhoch, Luis A. Serrano, Manal Al-Eid, Brian Fitzpatrick, Vincent M. Rotello, Graeme Cooke ORCID, Ifor D. W. Samuel ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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 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.