Porphyrin-Sensitized Solar Cells with Cobalt (II/III)-Based Redox Electrolyte Exceed 12 Percent Efficiency
Porphyrin-Sensitized Solar Cells with Cobalt (II/III)-Based Redox Electrolyte Exceed 12 Percent Efficiency
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DOI：
10.1126/science.1209688
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发表时间：
2011-11-04
期刊：
影响因子：
56.9
通讯作者：
Graetzel, Michael
中科院分区：
文献类型：
--
作者：
Yella, Aswani;Lee, Hsuan-Wei;Graetzel, Michael
碘化物/三碘化物氧化还原梭限制了染料敏化太阳能电池中可获得的效率。在这里，我们报告了介观太阳能电池，将Co（（II/III））三（联吡啶）为基础的氧化还原电解质与定制合成的供体-π桥-受体锌卟啉染料敏化剂（指定YD 2-o-C8）。YD 2-o-C8的特定分子设计极大地延迟了从纳米晶二氧化钛膜的导带到氧化的钴介体的界面背电子转移的速率，这使得能够实现接近1伏的惊人高的光电压。由于YD 2-o-C8卟啉在可见光谱范围内收集阳光，因此产生大的光电流。YD 2-o-C8与另一种有机染料的共敏化进一步增强了器件的性能，导致在模拟空气质量1.5全球阳光下测得的功率转换效率为12.3%。
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.