Geminate charge recombination in alternating polyfluorene copolymer/fullerene blends
2007 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 129, no 27, 8466-8472 p.Article in journal (Refereed) Published
By measuring excited state and charge dynamics in blends of an alternating polyfluorene copolymer and fullerene derivative over nine orders in time and two orders in light intensity, we have monitored the light-induced processes from ultrafast charge photogeneration to much slower decay of charges by recombination. We find that at low light intensities relevant to solar cell operation relatively fast (∼30 ns) geminate recombination is the dominating charge decay process, while nongeminate recombination has a negligible contribution. The conclusion of our work is that under solar illumination conditions geminate recombination of charges may be directly competing with efficient charge collection in polymer/fullerene solar cells. © 2007 American Chemical Society.
Place, publisher, year, edition, pages
2007. Vol. 129, no 27, 8466-8472 p.
IdentifiersURN: urn:nbn:se:liu:diva-39401DOI: 10.1021/ja068909qLocal ID: 48236OAI: oai:DiVA.org:liu-39401DiVA: diva2:260250