Journal
NANO LETTERS
Volume 9, Issue 12, Pages 4037-4041Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl902205n
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Funding
- Center for Advanced Molecular Photovoltaics [KUS-C1-015-21]
- King Abdullah University of Science and Technology (KAUST)
- Global Climate Energy Project (GCEP)
- National Science Foundation GRFP
- Fannie and John Hertz Foundation
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We investigate the internal quantum efficiencies (IQEs) of high efficiency poly-3-hexylthiophene:[6,6]-phenyl-C-61-butyric acid methyl ester (P3HT:PCBM) solar cells and find them to be lower at wavelengths where the PCBM absorbs. Because the exciton diffusion length in PCBM is too small, excitons generated in PCBM decay before reaching the donor-acceptor interface. This result has implications for most state of the art organic solar cells, since all of the most efficient devices use fullerenes as electron acceptors.
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