標題: | Porphyrin-Sensitized Solar Cells with Cobalt (II/III)-Based Redox Electrolyte Exceed 12 Percent Efficiency |
作者: | Yella, Aswani Lee, Hsuan-Wei Tsao, Hoi Nok Yi, Chenyi Chandiran, Aravind Kumar Nazeeruddin, Md. Khaja Diau, Eric Wei-Guang Yeh, Chen-Yu Zakeeruddin, Shaik M. Graetzel, Michael 應用化學系 應用化學系分子科學碩博班 Department of Applied Chemistry Institute of Molecular science |
公開日期: | 4-十一月-2011 |
摘要: | 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. |
URI: | http://dx.doi.org/10.1126/science.1209688 http://hdl.handle.net/11536/14663 |
ISSN: | 0036-8075 |
DOI: | 10.1126/science.1209688 |
期刊: | SCIENCE |
Volume: | 334 |
Issue: | 6056 |
起始頁: | 629 |
結束頁: | 634 |
顯示於類別: | 期刊論文 |