Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 132, Issue 34, Pages 11878-11880Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja1045742
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Funding
- U.S. Department of Energy [DE-FG02-07ER46474]
- Institute for the Promotion of Science and Technology in Flanders
- Korea Foundation for Advanced Studies
- U.S. Department of Energy (DOE) [DE-FG02-07ER46474] Funding Source: U.S. Department of Energy (DOE)
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We examine the significance of hot exciton dissociation in two archetypical polymer fullerene blend solar cells. Rather than evolving through a bound charge transfer state, hot processes are proposed to convert excitons directly into free charges. But we find that the internal quantum yields of carrier photogeneration are similar for both excitons and direct excitation of charge transfer states. The internal quantum yield, together with the temperature dependence of the current voltage characteristics, is consistent with negligible impact from hot exciton dissociation.
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