The impact of driving force on electron transfer rates in photovoltaic donor-acceptor blends
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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.
Ward , A J , Ruseckas , A , Kareem , M M , Ebenhoch , B , Serrano , L A , Al-Eid , M , Fitzpatrick , B , Rotello , V M , Cooke , G & Samuel , I D W 2015 , ' The impact of driving force on electron transfer rates in photovoltaic donor-acceptor blends ' Advanced Materials , vol 27 , no. 15 , pp. 2496–2500 . DOI: 10.1002/adma.201405623
© 2015 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
This work was funded by Engineering and Physical Sciences Research Council of the UK (grants EP/I00243X and EP/J009016) and the European Research Council of the European Union (grant 321305). I.D.W.S. also acknowledges support from a Royal Society Wolfson Research Merit Award. AJW acknowledges the Scottish Doctoral Training Centre in Condensed Matter Physics for financial support.
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