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]East China Univ Sci & Technol, Inst Fine Chem, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Chem & Mol Engn,Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Univ Sci & Technol Beijing, Sch Chem & Biol Engn, Dept Chem & Chem Engn, Beijing Key Lab Sci & Applicat Funct Mol & Crystal, Beijing 100083, Peoples R China;[3]Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 311121, Zhejiang, Peoples R China

年份：2025

卷号：13

期号：6

起止页码：4176

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001395163300001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (22131005, 22201074, 22075077 and 21908055), the Fundamental Research Funds for the Central Universities, the Shanghai Rising-Star Program (23QA1402100), the Natural Science Foundation of Shanghai (23ZR1415600 and 22ZR1416100), and the Science and Technology Planning Project of Hunan Province (2018TP1017). The authors thank the Research Center of Analysis and Test of East China University of Science and Technology for compound characterization and thank Prof. Cheng Lian (ECUST) for the theoretical calculations.

语种：英文

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.