Journal
SCIENCE
Volume 334, Issue 6056, Pages 629-634Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1209688
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Funding
- National Science Council of Taiwan
- Ministry of Education of Taiwan
- European Research Council (ERC) [ARG 247404]
- European community [227057]
- Dayton U.S. Air force Research Laboratory
- Ministry of Education, Science and Technology through the National Research Foundation of Korea [R31-2008-000-10035-0]
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The iodide/triiodide redox shuttle has limited the efficiencies accessible in dye-sensitized solar cells. Here, we report mesoscopic solar cells that incorporate a Co((II/III))tris(bipyridyl)-based redox electrolyte in conjunction with a custom synthesized donor-pi-bridge-acceptor zinc porphyrin dye as sensitizer (designated YD2-o-C8). The specific molecular design of YD2-o-C8 greatly retards the rate of interfacial back electron transfer from the conduction band of the nanocrystalline titanium dioxide film to the oxidized cobalt mediator, which enables attainment of strikingly high photovoltages approaching 1 volt. Because the YD2-o-C8 porphyrin harvests sunlight across the visible spectrum, large photocurrents are generated. Cosensitization of YD2-o-C8 with another organic dye further enhances the performance of the device, leading to a measured power conversion efficiency of 12.3% under simulated air mass 1.5 global sunlight.
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