Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 43, Pages 22794-22801Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp309636m
Keywords
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Funding
- Alexander von Humboldt-Foundation for respective Feodor Lynen fellowships
- University of Sydney for a Henry, Bertie and Florence Mabel Gritton Scholarship
- Deutsche Forschungsgemeinschaft (DFG) [583727]
- TRAPOS [SPP 1355]
- Federal Ministry of Education and Research (BMBF) [03EK3504]
- Australian Solar Institute [A-023]
- Australian Research Council's Discovery Projects funding scheme [DP110103300]
- Australian Research Council [LE0668257]
- BMBF
- state government of Berlin (SENBWF) in the framework of the program Spitzenforschung und Innovation in den Neuen Landern [03IS2151]
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The efficiency of thin-film solar cells with large optical band gaps, such as organic bulk heterojunction or amorphous silicon solar cells, is limited by their inability to harvest the (infra)red part of the solar spectrum. Photochemical upconversion based on triplet-triplet annihilation (TTA-UC) can potentially boost those solar cells by absorbing sub-bandgap photons and coupling the upconverted light back into the solar cell in a spectral region that the cell can efficiently convert into electrical current. In the present study we augment two types of organic solar cells and one amorphous silicon (a-Si:H) solar cell with a TTA-upconverter, demonstrating a solar cell photocurrent increase of up to 0.2% under a moderate concentration (19 suns). The behavior of the organic solar cells, whose augmentation with an upconverting device is so-far unreported, is discussed in comparison to a-Si:H solar cells. Furthermore, on the basis of the TTA rate equations and optical simulations, we assess the potential of TTA-UC augmented solar cells and highlight a strategy for the realization of a device-relevant current increase by TTA-upconversion.
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