文献类型：期刊文献

英文题名：Solar cells based on doubly concerted companion dyes with the efficiencies modulated by inserting an ethynyl group at different positions

作者：Wang, Yuqing[1];Li, Zhemin[1];Lu, Qingjun[1];Li, Qizhao[1];Luo, Jiaxin[1];Li, Chengjie[1];Xie, Yongshu[1]

机构：[1]East China Univ Sci & Technol, Inst Fine Chem, Key Lab Adv Mat, Sch Chem & Mol Engn,Frontiers Sci Ctr Materiobiol, Shanghai 200237, Peoples R China

年份：2024

卷号：35

期号：5

外文期刊名：CHINESE CHEMICAL LETTERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001209096400001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Nos. 22131005 , 22201074 , 22075077 and 21971063) , the Fundamental Research Funds for the Central Universities , Program of Shanghai Academic Research Leader (No. 20XD1401400) , Shanghai Rising-Star Program (No. 23QA1402100) and Natural Science Foundation of Shanghai (Nos. 23ZR1415600 , 22ZR1416100) .

语种：英文

外文关键词：Porphyrin; Ethynyl bridge; Charge-recombination; Dye sensitized solar cells; Doubly concerted companion dyes

摘要：To develop efficient sensitizers for dye-sensitized solar cells (DSSCs), we recently reported doubly concerted companion (DCC) dye XW83 with a wrapped porphyrin sub-dye unit linked to an organic sub-dye unit through a flexible chain, which exhibits panchromatic absorption and excellent anti-aggregation ability. To further improve the absorption, we herein report XW87 and XW88 by inserting an ethynyl group into the organic sub-dye unit of XW83 near the donor and acceptor, respectively. For the corresponding organic dyes Z3 and Z4 , the introduced ethynyl group improves their absorption, but induces aggravated charge recombination, leading to lowered power conversion efficiencies (PCEs). Similar to the organic dyes, the introduced ethynyl group improves the absorption of DCC dyes XW87 and XW88 as well. In addition, the ethynyl group near the acceptor of the organic sub-dye unit can be well protected by the long wrapping chains from the porphyrin unit. As a result, XW88 affords the highest JSC (21.84 mA/cm2 ), VOC (782 mV) and PCE (12.2%) among the DCC dyes. These results provide an effective method for developing efficient DSSC dyes by inserting an ethynyl group at a suitable position of a DCC dye. (c) 2024 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.