TY - JOUR
T1 - All-solid-state dye-sensitized solar cells with high efficiency
AU - Chung, In
AU - Lee, Byunghong
AU - He, Jiaqing
AU - Chang, Robert P.H.
AU - Kanatzidis, Mercouri G.
N1 - Funding Information:
Acknowledgements The authors acknowledge support for this collaborative research: NSF-DMR 0843962 for R.P.H.C.; DOE Energy Frontier Research Center, ANSER, DE-SC0001059 for B.H.L., J.H. and M.G.K.; the Initiative for Energy and Sustainability at Northwestern (ISEN) for I.C. Device testingandmeasurements were done in the ANSER Facilities and materials characterization was performed in the NSFMRSEC Facilities (DMR-1121262).
PY - 2012/5/24
Y1 - 2012/5/24
N2 - 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-x Gax Se2 (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 CsSnI 3 can be used for hole conduction in lieu of a liquid electrolyte. The resulting solid-state dye-sensitized solar cells consist of CsSnI 2.95 F 0.05 doped with SnF 2, 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, CsSnI 3 enhances visible light absorption on the red side of the spectrum to outperform the typical dye-sensitized solar cells in this spectral region.
AB - 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-x Gax Se2 (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 CsSnI 3 can be used for hole conduction in lieu of a liquid electrolyte. The resulting solid-state dye-sensitized solar cells consist of CsSnI 2.95 F 0.05 doped with SnF 2, 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, CsSnI 3 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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U2 - 10.1038/nature11067
DO - 10.1038/nature11067
M3 - Article
C2 - 22622574
AN - SCOPUS:84861417492
VL - 485
SP - 486
EP - 489
JO - Nature
JF - Nature
SN - 0028-0836
IS - 7399
ER -