期刊
CHEMICAL SCIENCE
卷 7, 期 1, 页码 559-568出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sc03215f
关键词
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资金
- Australian Renewable Energy Agency [A-023]
- Australian Research Council's Discovery Projects [DP110103300]
- ARENA Fellowships [6-F020, 5-F004]
- Alexander von Humboldt foundation
- Deutsche Forschungsgemeinschaft (DFG) [583727]
- Australian Research Council [FT130100177]
Photochemical upconversion based on triplet-triplet annihilation (TTA-UC) is employed to enhance the short-circuit currents generated by two varieties of thin-film solar cells, a hydrogenated amorphous silicon (a-Si:H) solar cell and a dye-sensitized solar cell (DSC). TTA-UC is exploited to harvest transmitted sub-bandgap photons, combine their energies and re-radiate upconverted photons back towards the solar cells. In the present study we employ a dual-emitter TTA-UC system which allows for significantly improved UC quantum yields as compared to the previously used single-emitter TTA systems. In doing so we achieve record photo-current enhancement values for both the a-Si:H device and the DSC, surpassing 10(-3) mA cm(-2) sun(-2) for the first time for a TTA-UC system and marking a record for upconversion-enhanced solar cells in general. We discuss pertinent challenges of the TTA-UC technology which need to be addressed in order to achieve its viable device application.
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