Porphyrin Cosensitization for a Photovoltaic Efficiency of 11.5%: A Record for Non-Ruthenium Solar Cells Based on Iodine Electrolyte

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• 作者：Yongshu Xie ; Yunyu Tang ; Wenjun Wu ; Yueqiang Wang ; Jingchuan Liu ; Xin Li ; He Tian ; Wei-Hong Zhu
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：137
• 期：44
• 页码：14055-14058
• 全文大小：302K
• ISSN：1520-5126

文摘

Dye-sensitized solar cells (DSSCs) are promising for utilizing solar energy. To achieve high efficiencies, it is vital to synergistically improve the photocurrent (J_sc) and the photovoltage (V_oc). In this respect, conjugation framework extension and cosensitization are effective for improving the absorption and the J_sc, which, however, is usually accompanied by undesirably decreased V_oc. Herein, based on a rationally optimized porphyrin dye, we develop a targeted coadsorption/cosensitization approach for systematically improving the V_oc from 645 to 727, 746, and 760 mV, with synergistical J_sc enhancement from 18.83 to 20.33 mA cm^鈥?. Thus, the efficiency has been dramatically enhanced to 11.5%, which keeps the record for nonruthenium DSSCs using the I₂/I₃^{鈥?/sup> electrolyte. These results compose an alternative approach for developing highly efficient DSSCs with relatively high V_oc using traditional iodine electrolyte.}