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

作　　者：Yuqing Wang Zhemin Li Qingjun Lu Qizhao Li Jiaxin Luo Chengjie Li Yongshu Xie 

机构地区：[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

出　　处：《Chinese Chemical Letters》2024年第5期189-192,共4页中国化学快报（英文版）

基　　金：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);Natural Science Foundation of Shanghai(Nos.23ZR1415600,22ZR1416100).

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/cm^(2)),V_(OC)(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.

关 键 词：PORPHYRIN Ethynyl bridge Charge-recombination Dye sensitized solar cells Doubly concerted companion dyes 

分 类 号：TM914.4[电气工程—电力电子与电力传动]