☆ 4.6 Article

Singlet fission efficiency in tetracene-based organic solar cells

APPLIED PHYSICS LETTERS (2014)

期刊

APPLIED PHYSICS LETTERS

卷 104, 期 19, 页码 -

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AMER INST PHYSICS

DOI: 10.1063/1.4876600

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Physics, Applied

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Center for Excitonics, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001088]
National Science Foundation [1122374]

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Singlet exciton fission splits one singlet exciton into two triplet excitons. Using a joint analysis of photocurrent and fluorescence modulation under a magnetic field, we determine that the triplet yield within optimized tetracene organic photovoltaic devices is 153% +/- 5% for a tetracene film thickness of 20 nm. The corresponding internal quantum efficiency is 127% +/- 18%. These results are used to prove the effectiveness of a simplified triplet yield measurement that relies only on the magnetic field modulation of fluorescence. Despite its relatively slow rate of singlet fission, the measured triplet yields confirm that tetracene is presently the best candidate for use with silicon solar cells. (c) 2014 AIP Publishing LLC.

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