Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 50, Pages 26674-26678Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp310821f
Keywords
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Funding
- Center for Advanced Molecular Photovoltaics [KUS-C1-015-21]
- King Abdullah University of Science and Technology (KAUST)
- National Science Foundation GRFP
- Fannie and John Hertz Foundation
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Early research on C-60 led to the discovery that the absorption of photons with energy greater than 2.35 eV by bulk C-60 produces free charge carriers at room temperature. We find that not only is this also true for many of the soluble fullerene derivatives commonly used in organic photovoltaics, but also that the presence of these free carriers has significant implications for the modeling, characterization, and performance of devices made with these materials. We demonstrate that the discrepancy between absorption and quantum efficiency spectra in P3HT:PCBM is due to recombination of such free carriers in large PCBM domains before they can be separated at a donor/acceptor interface. Since most theories assume that all free charges result from the separation of excitons at a donor/acceptor interface, the presence of free carrier generation in fullerenes can have a significant impact on the interpretation of data generated by numerous field-dependent techniques.
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