期刊
APPLIED PHYSICS LETTERS
卷 103, 期 26, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4858176
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资金
- 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 [DMR 1105392, 1122374]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1105392] Funding Source: National Science Foundation
Singlet exciton fission generates two triplet excitons per absorbed photon. It promises to increase the power extracted from sunlight without increasing the number of photovoltaic junctions in a solar cell. We demonstrate solar cells with an external quantum efficiency of 126% by enhancing absorption in thin films of the singlet exciton fission material pentacene. The device structure exploits the long photon dwell time at the band edge of a distributed Bragg reflector to achieve enhancement over a broad range of angles. Measuring the reflected light from the solar cell establishes a lower bound of 137% for the internal quantum efficiency. (C) 2013 AIP Publishing LLC.
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