• DOI:10.1038/nature11067
• Corpus ID: 4420558

All-solid-state dye-sensitized solar cells with high efficiency

@article{Chung2012AllsolidstateDS,
  title={All-solid-state dye-sensitized solar cells with high efficiency},
  author={In Jae Chung and Byunghong Lee and Jiaqing He and R. P. H. Chang and Mercouri G. Kanatzidis},
  journal={Nature},
  year={2012},
  volume={485},
  pages={486-489}
}

• I. Chung, Byunghong Lee, +2 authors M. Kanatzidis
• Published 24 May 2012
• Chemistry, Materials Science
• Nature

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. Replacements for iodine-based liquid electrolytes have been extensively studied, but the efficiencies of the resulting devices remain low. 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.