文献类型：期刊文献

英文题名：Solar cells sensitized with doubly concerted companion dyes with optimized donors to achieve high efficiencies up to 12.5%: a record efficiency for iodine electrolyte-based DSSCs

作者：Li, Zhemin[1]; Lu, Qingjun[1]; Zhang, Yuqian[1]; Li, Qizhao[1]; Wu, Wenjun[1]; Li, Shijun[3]; Wang, Hailong[2]; Jiang, Jianzhuang[2]; Li, Chengjie[1]; Xie, Yongshu[1]

机构：[1] Key Laboratory for Advanced Materials, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China; [2] Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry and Chemical Engineering, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, 100083, China; [3] College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Zhejiang, Hangzhou, 311121, China

年份：2024

卷号：13

期号：6

起止页码：4176

外文期刊名：Journal of Materials Chemistry A

收录：EI(收录号：20250417751211)

语种：英文

外文关键词：Biomineralization - Combustion - Dye-sensitized solar cells - Iodine compounds - Spectroscopic analysis - Synthesis (chemical)

摘要：Fluorenyl indoline based electron donors have been employed in constructing DSSC dyes with high photocurrents. However, commonly used fluorenyl indoline donors possess two or fewer alkyl chains and thus suffer from serious dye aggregation and charge recombination, resulting in undesirable moderate open-circuit voltages (VOC) in spite of high short-circuit current densities (JSC). To enhance the VOC and maintain high JSC, we herein report the design and synthesis of a fluorenyl indoline donor substituted with a dihexyloxyphenyl moiety, and thus porphyrin dye XW93 and the corresponding doubly concerted companion (DCC) dyes XW94 and XW95 have been synthesized and used to fabricate DSSCs based on iodine electrolyte, achieving enhanced VOC values of 734, 750 and 759 mV, respectively. Meanwhile, XW94 and XW95 exhibit a high IPCE plateau from 370 to 700 nm with onset wavelengths up to 820 nm, affording high JSC values over 22 mA cm?2 and relatively high power conversion efficiencies (PCEs) of 11.8% and 12.1%, respectively. To further improve the VOC, XW96 was synthesized by replacing the fluorenyl indoline donor with a bulky phenothiazine donor. The resulting DSSCs afford a considerably elevated VOC of 782 mV with the JSC slightly lowered to 21.97 mA cm?2. As a result of the excellent VOC and satisfactory JSC, the highest PCE of 12.5% has been achieved for XW96, which is the record efficiency for iodine electrolyte-based DSSCs, to the best of our knowledge. This work provides an effective approach for constructing high-performance DCC dyes based on optimized donors by combining the respective advantages of indoline and phenothiazine donors. ? The Royal Society of Chemistry 2025.