期刊
NATURE
卷 485, 期 7399, 页码 486-U94出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nature11067
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资金
- NSF-DMR [0843962]
- DOE Energy Frontier Research Center, ANSER [DE-SC0001059]
- Initiative for Energy and Sustainability at Northwestern (ISEN)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0843962] Funding Source: National Science Foundation
Dye-sensitized solar cells based on titanium dioxide (TiO2) are promising low-cost alternatives to conventional solid-state photovoltaic devices based on materials such as Si, CdTe and CuIn1-xGaxSe2 (refs 1, 2). Despite offering relatively high conversion efficiencies for solar energy, typical dye-sensitized solar cells suffer from durability problems that result from their use of organic liquid electrolytes containing the iodide/tri-iodide redox couple, which causes serious problems such as electrode corrosion and electrolyte leakage(3). Replacements for iodine-based liquid electrolytes have been extensively studied, but the efficiencies of the resulting devices remain low(3-9). Here we show that the solution-processable p-type direct bandgap semiconductor CsSnI3 can be used for hole conduction in lieu of a liquid electrolyte. The resulting solid-state dye-sensitized solar cells consist of CsSnI2.95F0.05 doped with SnF2, nanoporous TiO2 and the dye N719, and show conversion efficiencies of up to 10.2 per cent (8.51 per cent with a mask). With a bandgap of 1.3 electronvolts, CsSnI3 enhances visible light absorption on the red side of the spectrum to outperform the typical dye-sensitized solar cells in this spectral region.
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