首页|D-A-π-A organic dyes with fluorenyl-substituted bulky donor for efficient dye-sensitized solar cells

D-A-π-A organic dyes with fluorenyl-substituted bulky donor for efficient dye-sensitized solar cells

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Improving light-harvesting efficiency and suppressing interfacial charge recombination are of paramount importance to the development of Cu(Ⅱ/Ⅰ)redox shuttle-based dye-sensitized solar cells(DSSCs).Here,we present a rational molecular engineering on D-A-π-A organic sensitizers featuring with fluorenyl-substituted bulky donor(HY57,HY60,and HY61)for Cu(Ⅱ/Ⅰ)mediated DSSCs.By gradually enhancing conjugation and rigidity of the π-spacer and auxiliary acceptor moieties,the light-harvesting and electron-injection efficiencies can be simultaneously improved.The large size of fluorenyl-substituted arylamine donor together with abundant alkyl chains decorated on the molecular structures assist dense assembly of dye monolayer at surface of nanocrystalline TiO2,which largely suppress interfacial charge recombination losses.When applied in Cu(Ⅱ/Ⅰ)mediated DSSCs,the combination of an auxiliary acceptor of phenanthrene-fused-quinoxaline(PFQ)and a π-spacer of cyclo-pentadithiophene(CPDT)in dye HY61 results in a simultaneous enhancement in short-circuit current(Jsc)and open-circuit voltage(Voc),thus improving the power conversion efficiency(PCE)from 7.3％for reference dye HY59 to 10.3％for HY61.This study demonstrates that rigid and fused building block is promising towards constructing highly efficient organic sensitizers.

Dye-sensitized solar cellsFluorenyl-substituted bulky donorPhenanthrene-fused-quinoxalineElectron injectionPower conversion efficiency

Weiwei Zhang、Huiyun Jiang、Miaojie Yu、Jie Wang、Dong Shi、Wei-Hong Zhu、Yongzhen Wu

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Key Laboratory for Advanced Materials and Institute of Fine Chemicals,Joint International Research Laboratory of Precision Chemistry and Molecular Engineering,Feringa Nobel Prize Scientist Joint Research Center,Frontiers Science Center for Materiobiology and Dynamic Chemistry,School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai,200237,China

School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China,Chengdu,610054,China

国家自然科学基金国家自然科学基金国家自然科学基金Shanghai Municipal Science and Technology Major ProjectShanghai Municipal Science and Technology Major ProjectShanghai Municipal Science and TechnologyFundamental Research Funds for the Central Universities and China Postdoctoral Science Foundation

2217903721788102219050912018SHZDZX0321JC1401700201207102002019M651418

2023

10.1016/j.gce.2022.07.005

绿色化学工程(英文)
中国科学院过程工程研究所

绿色化学工程(英文)

CSCD
ISSN：
年,卷(期)：2023.4(4)
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