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American Chemical Society, Journal of the American Chemical Society, 35(132), p. 12440-12451, 2010

DOI: 10.1021/ja104786x

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Geminate Charge Recombination in Polymer/Fullerene Bulk Heterojunction Films and Implications for Solar Cell Function

Journal article published in 2010 by Suman Kalyan Pal, Tero Kesti, Manisankar Maiti, Fengling L. Zhang ORCID, Olle Inganas, Stefan Hellström, Mats R. Andersson ORCID, Frederic Oswald, Fernando Langa ORCID, T. Osterman, Tomas Österman, Torbjörn Pascher, Arkady Yartsev, Villy Sundstrom
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Abstract

We have studied the influence of three different fullerene derivatives on the charge generation and recombination dynamics of polymer/fullerene bulk heterojunction (BHJ) solar cell blends. Charge generation in APFO3/[70]PCBM and APFO3/[60]PCBM is very similar and somewhat slower than charge generation in APFO3/[70]BTPF. This difference qualitatively matches the trend in free energy change of electron transfer estimated from the LUMO energies of the polymer and fullerene derivatives. The first order (geminate) charge recombination rate is significantly different for the three fullerene derivatives studied and increases in the order APFO3/[70]PCBM