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Highly Fluorescent Semiconducting two-dimensional conjugated polymer Films Achieved by Side-Chain Engineering Showing Large Exciton Diffusion Length

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CCS Chemistry 2023年第10期5卷 2366-2377页

作者： Yongshuai Wang Qing Zhang Xiao-Ze Li Zhibin Shu Yihan Zhang Can Gao Yang Li Hao Liu Chenguang Li Hong-Hua Fang Hong-Bo Sun Xiaotao Zhang Wenping Hu Huanli Dong Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100190 Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207 Department of Chemistry National University of SingaporeSingapore 117543 State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084 Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072

Semiconducting two-dimensional conjugated polymers(2DCPs)with strong fluorescence emission have great potential for various optoelectronic ***,it is enormously challenging to achieve this goal due to the significant compact interlayerπ-πstacking-induced quenching effect in these *** this work,we found that highly fluorescent semiconducting 2DCPs can be prepared through an effective side-chain engineering approach in which interlayer spacers are introduced to reduce the fluorescence quenching *** obtained two truxene-based 2DCP films that,along with-C6H13 and-C_(12)H_(25)alkyl side chains as interlayer spacers both demonstrate superior fluorescence properties with a high photoluminescence quantum yield of 5.6%and 14.6%,*** are among the highest values currently reported for 2DCP ***,an ultralong isotropic quasi-twodimensional exciton diffusion length constrained in the plane with its highest value approaching 110 nm was revealed by the transient photoluminescence microscopy technique,suggesting that theπ-conjugated structure in these truxene-based 2DCP films has effectively been *** work can enable a broad exploration of highly fluorescent semiconducting 2DCP films for more deeply fundamental properties and optoelectronic device applications.

关键词： two-dimensional conjugated polymer side-chain engineering enlarged interlayer distance strong fluorescence emission large exciton diffusion length

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Synthesis of two-dimensional π-conjugated polymers pendent with benzothiadiazole and naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole moieties for polymer solar cells

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Science China Chemistry 2015年第2期58卷 257-266页

作者： Wei Li Qingduan Li Shengjian Liu Chunhui Duan Lei Ying Fei Huang Yong Cao Institute of polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

Four new 2D donor–acceptor conjugated polymers were designed and *** new polymers comprised fluorenealt-triphenylamine or carbazole-alt-triphenylamine as the backbones,and pendants with 2,1,3-benzothiadiazole(BT)or naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole(NT)in a triphenylamine unit as the side *** changing the acceptor BT for a stronger electron-withdrawing unit of NT moiety in the side chain,the energy levels,absorption spectra,band gaps,and charge-transport abilities of the resultant polymers could be effectively *** heterojunction solar cells with these polymers as the electron donors and(6,6)-phenyl-C71-butyric acid methyl ester as the electron acceptor exhibited high open-circuit voltage(more than 0.8 e V).The power conversion efficiency can be improved from 1.37%to 3.52%by replacing the BT with an NT moiety,which indicates that introducing NT as the side-chain building block can be an effective strategy to construct efficient 2D conjugated polymers for PSCs.

关键词： two-dimensional conjugated polymer benzothiadiazole naphthobisthiadiazole bulkheterojunction polymer solar cell

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